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December 2015 - present
January 2009 - November 2015
Education
July 2000 - May 2002
July 1997 - May 2000
Publications
Publications (135)
This study reports syntheses of a set of unique ionic hybrid composites to efficiently remove gold anions from acidic wastewater. The hybrid composites were easily obtained using a well-known metal–organic framework (MOF) and an ionic viologen organic framework (iVOF) that were thoroughly characterized. The highest uptake capacity recorded by iVOF-...
Xanthene‐based organic chemosensors for detecting metal ions are a topic of research. While Rhodamine and Fluorescein‐based sensors are more common, fewer research articles exist on Eosin‐based sensors. Herein, a new chemosensor (EY‐S) is reported that was obtained efficiently in two high‐yielding reaction steps from commercially procured Eosin Y....
Covalent organic frameworks (COFs) are crystalline porous materials bearing well-ordered two- or three-dimensional molecular tectons in their polymeric skeletal framework. COFs are structurally robust as well as physiochemically stable. Recently,...
The syntheses of ionic porous organic polymers (iPOP) via ionothermal strategy or using solvents with high boiling points are not environmentally friendly approaches. Further, the green synthesis of an ionic porous organic polymer is not reported till date. Azo-coupling reaction is considered as a green synthetic strategy that has been used to obta...
A set of two unique hybrid POPs (HPOP-1 and HPOP-2) bearing triptycene and phosphazene units has been developed for their use as strategic materials capable of sensing HCl acid vapor and capturing/storing iodine. The materials were synthesized via the well-known Schiff base reaction, leading to the inclusion of ample imine linkages in the resultant...
The Suzuki‐Miyaura cross‐coupling (SMCC) involves the coupling of organohalides and organoboron molecules in the presence of Pd(II)‐based catalysts. Often SMCC reactions employ homogenous catalysts. However, such homogenous SMCC reactions are associated with certain limitations which has motivated design of effective and sustainable Pd(II)‐based he...
The synthesis of three conjugated copolymers TPP1–3 was carried out using a palladium-catalyzed [3+2] cycloaddition polymerization of 1,6-dibromopyrene with various dialkynyl thiophene derivatives 3a–c. The target copolymers were obtained in excellent yields and high purity, as confirmed by instrumental analyses. TPP1–3 were found to divulge a cons...
A super hydrophobic composite is developed for the first time through the non-covalent self-assembly of a hydrophilic covalent organic framework (COF) and a amphoteric CD to achieve highly selective separation...
Syntheses of five (1–5) cationic organometallic complexes bearing two platinum (II) centers are being reported. Compounds 1 and 2 have a flexible molecular backbone and are isomeric. Compounds 3, 4, and 5 are structural isomers with a rigid structural framework and containing pyrimidine/pyrazine in the center and two pendant arms bearing the alkyny...
Global concerns related to the rise in worldwide energy demand, along with the pledge to minimize greenhouse gas emissions, have encouraged developed nations to opt for clean, efficient, and sustainable nuclear energy. However, the generation of volatile radioactive by-products (such as ¹²⁹I and ¹³¹I) during the operation of a nuclear power plant i...
Two unique ionic covalent organic networks (iCONs) incorporated with guanidinium motifs were obtained and characterized by various techniques. Upon 8 h of treatment with iCON-HCCP (250 μg/mL), >97% killing of Staphylococcus aureus, Candida albicans, and Candida glabrata strains was observed. Antimicrobial efficacies against bacteria and fungi were...
The main contaminants in aqueous solutions that bio-magnify in living organisms include (but are not limited to) heavy metal-based toxic oxo-anions (CrO42—, MnO4—, ReO4—, HAsO4— etc.), anionic radioactive pollutants (such...
Energy‐economic separation of wide array of toxic pollutants from water using macro‐micro hierarchical porous crafted in an ionic organic framework is reported by Sujit K. Ghosh et al. in their Research Article (DOI: 10.1002/anie.202214095). The uniformly distributed ordered interconnected macropores in synergy with charged viologen units demonstra...
Die energieeffiziente Abtrennung toxischer Schadstoffe aus Wasser unter Verwendung von makro/mikro‐hierarchischen porösen Materialien in einem ionischen organischen Gerüst präsentieren Sujit K. Ghosh et al. in ihrem Forschungsartikel (DOI: 10.1002/ange.202214095). Die gleichmäßig verteilten, geordneten Makroporen in Synergie mit geladenen Viologen‐...
In case of pollutant segregation, fast mass diffusion is a fundamental criterion in order to achieve improved performance. The rapid mass transport through porous materials can be achieved by availing large open pores followed by easy and complete accessibility of functional sites. Inducing macroporosity into such materials could serve as ideal sol...
In case of pollutant segregation fast mass diffusion is a fundamental criterion in order to achieve improved performance. The rapid mass transport through porous materials can be achieved by availing large open pores followed by easy and complete accessibility of functional sites. Inducing macroporosity into such materials could serve as ideal solu...
A new di‐platinum (II) organometallic compound (3) has been synthesized from a readily available pyrimidine derivative in two steps. 3 is a conformationally flexible molecule due to the presence of ethereal linkages. The application of 3 as an acceptor tecton in supramolecular chemistry was explored using coordination‐driven self‐assembly protocol....
The use of direct arylation polymerization (DArP) as a viable strategy to obtain porous organic polymers (POPs) has not been explored to its full potential. Instead, other strategies (such as conventional cross-coupling reactions) are usually employed to yield POPs that employ expensive metal-based monomers whose syntheses require multiple steps. H...
The last decade witnessed a flourishing advancement in the design and synthesis of discrete Pt–based metallamacrocycles self‐assembled using coordination bonds. Such supramolecular entities were obtained using novel nitrogen–based ligands and have wide and versatile applications such as chemical sensors, catalysts, theranostic agents, optical mater...
The effective and efficient capture as well as storage of radioisotopes of iodine is of significant importance in the treatment of nuclear waste. Further, the use of radioisotopes of iodine in medical therapy requires proper capture of radioactive iodine. Thus, there is a pressing need to develop novel adsorbents obtained using easy and simple meth...
![Reaction conditions: (a) cis‐[Pd (PPh3)2Cl2], trimethylsilylacetylene,...](publication/360361350/figure/fig5/AS:11431281173755465@1689032402123/Reaction-conditions-a-cis-Pd-PPh32Cl2-trimethylsilylacetylene-CuI-and-Et3N_Q320.jpg)
Synthesis and characterization of a set of four Pt (II)–based organometallic compounds (7‐10) are being described. These molecules are unique since each of these contains three biologically active structural motifs, in the form of a pyrazine ring that connects a Pt‐alkynyl and a triazole ring. These organoplatinum molecules have been characterized...
Design and synthesis of unique photoluminescent triptycene-based porous polymers (TBP-OH and TBP-NH2) bearing active functional groups is described herein. Pd catalyzed Sonogashira cross-coupling reaction was utilized to obtain these polymeric networks that are nanoporous and strongly fluorescent in THF. In solid state, these polymers demonstrated...
Increasing levels of CO2 in the atmosphere have led to serious problems. In view of this, we synthesized nanoarchitectonics porous organic polymers (NPOPs) by a catalyst-free coupling reaction between cyanuric chloride and 4,4-diaminoazobenzene or bisphenol-A in a polymer framework involving a nucleophilic substitution reaction for CO2 capture. Fou...
A novel triptycene-based azo polymer (TBAP) was explored as a switching material in an atomic switch showing resistive change under voltage sweep and pulse. Current atomic force microscope (C-AFM) measurements...
We report herein a new triptycene derivative (1) with an azo functional group. This molecule has been used as a monomer to yield two linear polymers (TAFPs) that have several triptycene units dangling from the linear polymer chain. TAFPs are soluble in organic solvents and are thermally stable. TAFPs can be cast into thin films. Further, these poly...
This work describes facile synthesis of a porous polymeric material (T‐HCP) using readily available reagents. Specifically, T‐HCP is a thermally stable and hypercrosslinked polymer (HCP) that is essentially microporous with a high BET specific surface area (940 m² g⁻¹). Triptycene based polymers are known to feature internal free volume. Thus, the...
Coal-fired power plants are the highest contributor to global electricity generation. Flue gases from thermal power plants are rich in carbon dioxide. Thus, thermal plants also contribute substantially to the annual increase in the concentration of atmospheric CO2 (greenhouse gas) which in turn leads to increased global warming and ocean acidificat...
Nuclear energy is considered as the best alternative to fossil fuel to meet the ever-increasing global electricity demand. Nuclear electricity generation is not associated with direct emission of greenhouse gases unlike thermal power plants. On the flipside, tackling nuclear waste and spent fuel is a major issue, which becomes even more challenging...
We report the synthesis of metalorganic copolymers made from the palladium catalyzed Sonogashira cross-coupling reaction between various iron(II) clathrochelate building blocks with diethynyl-triptycene and fluorene derivatives. The target copolymers CCP1-5 were isolated in excellent yield and characterized by various instrumental analysis techniqu...
In the present study, we report the synthesis, characterization, molecular docking and theoretical studies of two new copper(II) [Cu2(L1)2(py)2]·H2O (1) and nickel(II) [Ni(L2)2] (2) coordination complexes, which are made through the coordination of (E)-N′-(5-bromo-2-hydroxybenzylidene) benzohydrazide (H2L1) and 1-((E)-(2-methoxyphenylimino) methyl)...
A unique set of polymers were conveniently obtained by marriage of ‘cubic’ octavinylsilsesquioxane (OVS) and ‘paddle wheel’ shaped triptycene using the simple and economical Friedel–Crafts reaction. The resulting ‘hybrid inorganic–organic polymers’ (STNPs) are nanoporous with higher surface areas than several previously reported porous polymeric ne...
Three novel pyrimidine based bis-uracil derivatives 1–3 were synthesized by the condensation reaction of 2-hydroxynaphthaldehyde with 6-amino-1,3-dimethylpyrimidine-2,-4(1H, 3H)-dione; 6-amino-1, 3-diethylpyrimidine-2,-4(1H, 3H)-dione, and 6-amino-1,-ethyl-3-methylpyrimidine-2,-4(1H, 3H)-dione, respectively and structurally characterized. The preli...
In the present study, we report synthesis, characterization, structural and theoretical studies of two copper(II) complexes, [Cu(py)2(L¹)2] (1) and [Cu(phen)(Ac)2-Cu2(Ac)4]n (2), and a nickel(II) complex, [Ni(bipy)(L)(Ac)] (3), where py = pyridine, L¹ = 3,5-dichloro-2-hydroxybenzaldehyde, phen = 1,10-phenanthroline, Ac = acetate ion, bipy = 2,2’-bi...
The synthesis of triptycene-based three-dimensional networks and their uptake towards various gases are described. The target polymers TPP1-3 were synthesized by employing a convenient palladium-catalyzed Suzuki-Miyaura cross-coupling reaction between a triptycene synthon bearing two peripheral dibromotetraphenyl benzene (TBT) units and various ary...
A set of unique triptycene-based and organic Schiff-base-linked polymers (TBOSBLs) are conveniently synthesized in which triptycene motifs are connected with 1,3,5-triformylphloroglucinol units via Schiff-base linkages. TBOSBLs are amorphous, thermally stable with a reasonable surface area (SABET up to 649 m²/g), and have abundant nanopores (pore s...
A set of five nanoporous (pore size <100 nm) amine-functionalized and triptycene-based organic polymers (TBPALs) were prepared using commercially available phenols (such as quinol and phloroglucinol) and triptycene amines. C–N bonds were formed in the polymerization reactions without employing transitional metal catalysts such as PdII or CuI. TBPAL...
Sustainable energy is the most valuable clean and renewable energy for the future. A simple, robust, and inexpensive ecofriendly method has been developed here to prepare chitosan-based zeolite porous biocomposites via solvent exchange followed by calcination. The resulting chitosan-based zeolite biocomposites were characterized using advanced tech...
A design and synthesis of three unique triptycene based polymers containing azo linkages in the side chain of polymer backbone is being reported herein for the first time. These triptycene based azo-polymers (TBAPs) have high solubility in common organic solvents due to the presence of pendent alkyl chains as well as triptycene motifs. TBAPs are we...
Gradual increase in CO2 emission due to energy production from fossils fuels is a major contributor to global warming. Alternatively, “carbon free” nuclear energy generates radioactive and carcinogenic iodine vapors. Thus, the need to develop efficient sorbents for capture of CO2 and I2 is justified. Herein, we report a Triptycene-based-Hydroxyl-Az...
A pyrimidine based organic donor clip with pendant pyridyl rings has been designed for its use in construction of a supramolecular coordination complex (SCC). This molecule is a new addition to the library of “nitrogen donor ligands” that have been used as building blocks to yield SCCs of various shapes and sizes. Its self‐assembly with a suitable...
Two new triptycene-based azobenzene-functionalized polymers (TBAFPs) have been synthesized using the well-known Pd-catalyzed Sonogashira cross-coupling polycondensation reaction between 2,6-diethynyltriptycene and (meta or para) dibromo-azobenzenes. Enhancement of the fluorescent emission intensity was observed upon trans → cis isomerization of −N═...
In the present investigation, we report the synthesis and characterization of three novel nickel(II) [Ni(L)2] (1) and copper(II) [Cu(L)2] (2a) and [Cu(L)2] (2b) complexes, which are made through the coordination of (E)-1-(2-methoxybenzylidine)-4-phenylethiosemicarbazone (HL) as bidentate N,S-ligand. Several modern techniques including experimental...
Two new organometallic compounds (1 and 2) containing multiple platinum(II) centers have been synthesized. 1 and 2 are structural isomers having the same molecular formula but they are different either in terms of the N-heterocycle present in the center or relative orientation of the two pendant arms bearing the alkynyl-Pt(PEt 3 ) 2 I units. 1 and...
In the present study, we use a dual approach comprising of experimental and computational techniques to report the syntheses, characterizations ( ¹ H NMR, ¹³ C NMR, FT-IR, UV–visible spectroscopy and X-ray structure determination) and theoretically evaluated the third order NLO response properties of the new organic compounds; 1-((E)-(2-methoxy-4-n...
Exploring the surface self-assembly of small molecules that act as building blocks (tectons) for complex supramolecular structures is crucial for realizing surface-supported functional molecular devices. Here, we report on the synthesis and surface self-assembly of a new pyrazine-derived molecule with pyridine pendants. Ambient scanning tunneling m...
The syntheses, characterizations, and biological activities of three organoplatinum compounds, each containing a triazole ring, are discussed. These organometallic compounds demonstrate superior cytotoxicity against osteosarcoma and human breast cancer cells relative to cisplatin, a well-known chemotherapeutic agent used for chemotherapy.
The synthesis and characterization of a new pyrazine-based ditopic organoplatinum(II) complex having a bite angle of 180° is reported. The facile and efficient syntheses are described of three discrete neutral Fe(II)/Pt(II) heterobimetallic SCCs with Pt(II) acceptor clips of different binding angles, 0, 120, and 180°. These new SCCs were characteri...
Two nanoporous azo polymers (NAPs) have been designed incorporating triptycene and porphyrin motifs in the polymer framework that are linked covalently by azo functional groups. NAPs are synthesized using metal-catalyst free polycondensations in basic medium. These are thermally stable, microporous (Type-I isotherms in N2 adsorption–desorption meas...
We report unique triptycene‐based alternating copolymers bearing long alkyl chains as pendants. Syntheses utilized 2,6‐diethynyltriptycene and appropriate alkyloxyarene monomers polymerized via Sonogashira cross‐coupling reaction to yield triptycene‐based poly(phenylene ethynylene)s. Resulting polymers are soluble in organic solvents and were chara...
The coordination driven self-assembly of three new “neutral” metallomacrocycles is described using a semi-rigid di-Pt(II) organometallic complex. These [2+2] macrocycles have distorted hexagonal cavities and are nanoscalar in dimension. Furthermore, it was observed that these neutral self-assembled discrete ensembles effectively shield the platinum...
Two nanoscalar and supramolecular metallacycles were self-assembled by employing a predesigned pyrazine based molecular “acceptor” clip with two different ditopic pyridyl “donor” tectons. The platina macrocycles were characterized by multinuclear NMR spectroscopy, mass spectrometry (ESI-MS), and elemental analyses. Molecular modelling using PM6 sem...
In the present study, we use a dual approach comprising of experimental and computational techniques to report the syntheses and characterizations of two novel nickel (II) [Ni(L)2] (1) and copper (II) [Cu(L)2] (2) coordination complexes, which are made through the coordination of 1-(E-(2, 4-dibromophenylimino) methyl) naphthalene-2-ol (HL) ligand....
Three new salen-type copper (II) and nickel (II) complexes viz. [Cu(L)2] (1); [Ni(L)2] (2); [Ni(L¹) (DMF)] (3), where HL = 2-((E)-(4-bromo-2-chlorophenylimino) methyl)-6-bromo-4-nitrophenol and HL¹= (E)-1-(3,5-dichloro-2-hydroxybenzylidene)-4,4-dimethylthiosemicarbazide; DMF = N, N-dimethylformamide, have been successfully achieved and structurally...
A unique irregular hexagon was self-assembled using an organic donor clip (bearing terminal pyridyl units) and a complementary organometallic acceptor clip. The resulting metallamacrocycle was characterized by multinuclear NMR, mass spectrometry, and elemental analyses. Molecular modeling confirmed hexagonal shaped cavity for this metallamacrocycle...
The quantitative, single step, self-assembly of a shape-persistent, three-dimensional C3v-symmetric, triptycene-based tris-terpyridinyl ligand initially gives a platonic-based cubic architecture, which was unequivocally characterized by 1D and 2D NMR spectroscopy, mass spectrometry, and single crystal X-ray structural analysis. The unique metal-lig...
Polymerization of 2,6,14-triethynyltriptycene and 1,3,5-tris(azidomethyl)-2,4,6-trimethylbenzene to yield a new microporous organic material (TTMP) is described. TTMP is thermally stable polymer with a high surface area, rendering it suitable to act as an adsorbent for gases such as CO2 and H2 as well as for organic small molecule adsorbates such a...
The syntheses and characterization of two cationic two-dimensional metallamacrocycles are described. Both the macrocycles utilize pyrazine molecule as donor tecton along with two flexible diplatinum(II) organometallic acceptor tectons. Formation of macrocycles was supported by elemental analyses (CHN), multinuclear NMR and electrospray ionization m...
DNA derived well-controlled arrangement of porphyrins has emerged as promising hybrid nanostructures. Exceptional biocompatibility and DNA-directed surface addressability coupled with rich symmetry features of the porphyrin have made these hybrid nanostructures attractive candidates for potential biomedical and biotechnological applications. Howeve...
Two new irregular hexagons (6 and 7) were synthesized from a pyrazine motif containing an organometallic acceptor clip [bearing platinum(II) centers] and different neutral donor ligands (4,4'-bipyridine or pyrazine) using a coordination-driven self-assembly protocol. The two-dimensional supramolecules were characterized by multinuclear NMR, mass sp...
Fluorescent materials have emerged as one of the promising candidates for chemical sensing due to their high sensitivity towards analytes that are relatively electron deficient such as nitroaromatics (NACs). Herein, four new 1,2,3-triazole functionalized dibromo monomers (2-5) have been synthesized. These dibromo monomers (2-5) have been subsequent...
In contemporary research, there is a growing interest in the development of novel porous materials that can be used as adsorbents for small gas molecules such as CO2 and H2. This is important from a perspective of more efficient energy alternative and a cleaner environment. Hyper-cross-linked polymers are a subclass of microporous organic polymers...
DNA derived well-controlled arrangement of porphyrins has emerged as promising hybrid nanostructures. Exceptional biocompatibility and DNA-directed surface addressability coupled with rich symmetry features of the porphyrin have made these hybrid nanostructures attractive candidates for potential biomedical and biotechnological applications. Howeve...
Synthesis of a new pyrazine-based “flexible” and ditopic platinum(II) organometallic clip (3) is being reported. Flexibility is incorporated by ether functional groups that bridge the rigid core (pyrazine) and periphery (PtIIcenters). Its self-assembly with various dicarboxylates in a 1:1 stoichiometric ratio yields [2 + 2] dimeric neutral metallac...
A facile and efficient synthesis of a series of five new pyrazine-based organometallic complexes is being reported. The complexes (2–6) have been fully characterized. Molecules 2, 3 and 6 were structurally characterized by single crystal X-ray crystallographic analyses. Additionally, anticancer properties of these organometallic complexes have been...
In contemporary research, there has been a surge in the efforts to design novel porous materials as adsorbents for CO2 capture. Polyamides are a class of robust polymers that are easy to synthesize from readily available starting materials. These have CO2-philic amide functional groups and hence are being considered as materials for CO2 adsorption...
The synthesis and characterization of a new pyrazine-based "flexible" and ditopic platinum(ii) organometallic molecule (3) is being reported. Flexibility in this molecule is due to the presence of ether functional groups that bridge the rigid core and periphery. Due to the presence of square planar Pt(ii) centers at the two ends, the molecule's pot...
Herein, we describe the successful construction of composite DNA nanostructures by the self-assembly of complementary symmetrical 2,6,14-triptycenetripropiolic acid (TPA)-DNA building blocks and zinc protoporphyrin IX (Zn PpIX). DNA-organic molecule scaffolds for the composite DNA nanostructure were constructed through covalent conjugation of TPA w...
Coordination of a triptycene-based ditopic Schiff base ligand (H2L) with Zn2+ leads to the formation of a novel trinuclear circular species. A combination of 1H NMR spectroscopy, infrared spectroscopy, mass spectrometry and elemental analysis allow the unambiguous characterization of H2L and Zn3L3•8H2O. DFT molecular modelling has been used to stud...
Two new supramolecular building blocks derived from pyrazine are introduced. These molecules, having pendant pyridine units covalently linked to central pyrazine ring, are structurally rigid with pre-defined bite angles. Therefore they can act as donor tectons in design of supramolecular hexagons using coordination driven self-assembly protocol. Mu...
Herein, facile synthesis and characterization of four triazole linked network polymers (TNPs) in high yields is described. These nitrogen rich polymers are derived using a "click" reaction between 2,6,14-triazido triptycene and various di- or triethynyl comonomers. The TNPs are microporous and exhibit high surface area (SABET up to 1348 m2 g-1). Du...
The synthesis and characterization of cationic two-dimensional metallamacrocycles having a hexagonal shape and cavity are described. Both macrocycles utilize a pyrazine motif containing an organometallic acceptor tecton with platinum(II) centers along with different donor ligands. While one macrocycle is a relatively larger [6 + 6], the other is a...
We report facile synthesis of a new triptycene based monomeric building block 2,6-diazidotriptycene
(DAZT) that has been utilized to synthesize a series of triptycene based and triazole linked alternate
co-polymer (TPT1-TPT4) via Cu(I)OAc catalyzed Sharpless “Click reaction”. The effect of reaction temperature
on regioselective incorporation of 1,2...
The design, synthesis, and characterization of a new pyrazine-based ditopic platinum(II) organometallic complex are reported. The molecular structure of the organoplatinum pyrazine dipod was determined by single-crystal X-ray crystallography. The potential utility of this organometallic ditopic acceptor as a building block in the construction of ne...
