Tamal Das

Tamal Das
CSIR - National Chemical Laboratory, Pune | NCL · Physical and Materials Chemistry Division (NCL)

Msc.

About

30
Publications
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426
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Introduction
I am working in the comutational chemistry field by applying quantum chemistry, my recent project work is the effect of microhydration on the ionisation energy of different tautomers of cytosine.

Publications

Publications (30)
Article
Disilenes with differently coordinated silicon atoms are not known. Here, we have shown the high yield synthesis of a range of disilenes ( 2 - 4 and 6 ) upon reaction of a hypersilyl silylene PhC(N t Bu) 2 SiSi(SiMe 3 ) 3 ( 1 ) with aliphatic chlorophosphines. The most striking characteristic of these disilenes is the presence of two differently co...
Article
Unprecedented formation of a series of unsymmetrical disilenes was achieved by reacting amidinato hypersilylsilylene and chlorophosphines with α-hydrogen atoms. The coordination number of the two doubly bound silicon atoms are different. Chlorophosphines without α-hydrogen atoms led to phosphinosilylene and silanes. Abstract Disilenes with differe...
Article
Full-text available
At the dawn of the Universe, the ions of the light elements produced in the Big Bang nucleosynthesis recombined with each other. In our present study, we have tried to mimic the conditions in the early Universe to show how the recombination process would have led to the formation of the first ever formed diatomic species of the Universe: HeH+, as w...
Article
Luminescent solvent-free organic liquids are known for their enhanced quantum yield, color tunability, and availability of a matrix for other dopants to generate hybrid luminescent materials with improved features for newer applications. Herein, we report a donor-acceptor based luminescent "exciplex liquid" by utilizing the slightly different elect...
Article
Selective and efficient hydroboration of esters and carbodiimides to alcohols and amines by two well-defined and readily accessible lithium complexes, 2,6-di-tert-butyl phenolate lithium (1a) and 1,1’-dilithioferrocene (1b) are described. A range of aliphatic, aromatic, and cyclic esters with various functional groups were selectively converted int...
Article
Full-text available
The reaction of IDipp with C5F5N led to functionalization of all three carbon atoms of the imidazole ring with HF2-as the counter-anion (1). Reactivity with 2,3,5,6-tetrafluoropyridine gives only C−F bond...
Article
Full-text available
A selective and efficient route for the deoxygenative reduction of primary to tertiary amides to corresponding amines has been achieved with pinacolborane (HBpin) using simple and readily accessible 2,6-ditertbutyl phenolate...
Article
A nacnac-based tridentate ligand containing a picolyl group (L) was employed to isolate a chlorogermylene (1). The reaction of 1 with another equivalent of GeCl2•dioxane surprisingly gave a pyridylpyrrolide based...
Article
Selective detection of explosives, especially TNT, is a highly desirable area of research and various explosives detection devices including fluorescent sensors are already in place. However, multi-mode sensors will be more useful and reliable than conventional fluorescent “Turn Off” sensors. One of the challenges is the development of selective se...
Article
The reactions of the germylenes, [(Dipp)NCMeCHCORGeCl] (1a: R = Me, 1b: R = Ph) with [Ir2Cl2(μ-Cl)2(η⁵-Cp*)2] led to the formation of the adducts [(Dipp)NCMeCHCORGeClIrCl2Cp*] (3a: R = Me and 3b: R = Ph). On the other hand, [Rh2Cl2(μ-Cl)2(η⁵-Cp*)2] does not react with the germylenes (1a and 1b). When the reactions of 1a and 1b are carried out with...
Article
The hydroboration of alkenes and alkynes using easily accessible lithium compounds [2,6-ditertbutyl phenolatelithium (1a) and 1,1' dilithioferrocene (1b)] have been achieved with good yields, high functional group tolerance and excellent...
Article
The seminal Urey–Miller experiments showed that molecules crucial to life such as HCN could have formed in the reducing atmosphere of the Hadean Earth and then dissolved in the oceans. Subsequent proponents of the “RNA World” hypothesis have shown aqueous HCN to be the starting point for the formation of the precursors of RNA and proteins. However,...
Article
Angetrieben durch Rearomatisierung: Das Addukt eines nukleophilen chiralen Phosphits mit einem Azaaren‐N‐allyl‐Salz erfährt eine basenvermittelte Aza‐Wittig‐Umlagerung. Diese Methode generiert effizient tertiäre und quartäre Stereozentren in Isochinolin‐, Chinolin‐ und Pyridinsystemen zusammen mit einer Alkengruppe zur weiteren Funktionalisierung....
Article
A phosphite mediated [2,3]‐aza‐Wittig rearrangement has been developed for the regio‐ and enantioselective allylic alkylation of six‐membered hetero‐aromatic compounds (azaarenes). The nucleophilic phosphite adduct of N‐allyl salts undergoes a stereoselective base mediated aza‐Wittig rearrangement and dissociation of the chiral phosphite for overal...
Article
Boron embedded aromatic hydrocarbons are a class of molecules known for peculiar electronic and/or optoelectronic properties and thereby benefitted for many potential applications. Among those, boronic ester and acid containing molecules have been widely used for sensing and molecular recognition applications, respectively. Here, we compare the sen...
Article
Full-text available
Stabilization of an amidinatosilylene with a bulky tris(trimethylsilyl)silyl substituent was realized with the preparation of PhC(NtBu)2Si{Si(SiMe3)3} (1) from PhC- (NtBu)2SiHCl2 with K{Si(SiMe3)3} in more than 90% yield. The highly deshielded 29Si NMR resonance (δ = 76.91 ppm) can be attributed to the absence of a π-donating substituent. The molec...
Article
Organic phosphors have been widely explored with an understanding that crystalline molecular ordering is a requisite for enhanced intersystem crossing. In this context, we explore the room temperature phosphorescence features of a solvent‐free organic liquid phosphor in air. Given alkyl chain substitution varied the physical states of bromonaphthal...
Article
Organic phosphors have been widely explored with an understanding that crystalline molecular ordering is a requisite for enhanced intersystem crossing. In this context, we explore the room temperature phosphorescence features of a solvent‐free organic liquid phosphor in air. Given alkyl chain substitution varied the physical states of bromonaphthal...
Article
Full-text available
Host‐guest chemistry is a functional model in supramolecular chemistry for the understanding of specific process occurring in biological systems. Herein, we disclose rationally designed and giant multi‐armed hexaphenylbenzene (HPB)‐based supramolecular frameworks which could encapsulate a variety of guest molecules in the voids of their crystal lat...
Article
Stimuli responsive tunable luminescence is a promising field of research. Even though mechanofluoroscence is widely studied, mechanophosphorescence stays unexplored. Here we report the mechano-driven fluorescence and phosphorescence variations of a pyrene tetraboronic ester derivative. The fluorochromic and room temperature phosphorescence features...
Article
Full-text available
Simple and readily accessible lithium compounds such as 2,6-ditertbutyl phenolate lithium (1a), 1,1' dilithioferrocene (1b) and nacnac lithium (1c) are found to be efficient single site catalysts for hydroboration of...
Article
This study demonstrates the preparation and structural characterization of a Si(IV) hydride (PhC(NtBu)2SiH(CH3)Cl) (1) and its use as a catalyst for cyanosilylation of a variety of aldehydes. Compound 1 represents the first neutral penta-coordinate silicon(IV) species that catalyzes cyanosilylation of aldehydes under mild condition.
Article
An efficient, metal free approach to 3-substituted 3-hydroxy oxindole by DBU mediated highly diastereoselective addition of aryl acetonitrile to N-protected isatin under mild condition has been developed. The reaction proceeds smoothly to produce respective cyanomethylated adducts in good yield and excellent diastereoselectivity. Further transforma...
Article
Full-text available
The transition metal free catalytic hydroboration of aldehydes and ketones is very limited and has not been reported with a well-defined silicon(iv) compound. Therefore, we chose to evaluate the previously reported silicon(iv) hydride [PhC(NtBu)2SiHCl2], (1) as a single component catalyst and found that it catalyzes the reductive hydroboration of a...
Article
Herein, we introduce isocyanide as a ligand in main group chemistry and describe the facile isolation of a Ge(ii) dication. The reaction of 2,6-dimethylphenylisocyanide with GeCl2 leads to the formation of a Ge(ii) dication with two [GeCl3](-) molecules as counter anions. The dicationic Ge(ii) center is bound to four isocyanide ligands and also hol...
Article
A simple, facile and environmentally benign intramolecular dehydrogenative coupling of a variety of 1,2-diarylethylenes for the synthesis of phenantherens in excellent yield has been described. This new methodology uses ceric ammonium nitrate (CAN) as a promoter at room tem-perature and has been extended to intermolecular synthesis of biaryl compou...
Article
An unusual diastereoselective Grignard reaction is explored, where the Grignard reagents are derived from 1,n-dihaloalkanes. A steric bias due to the presence of a quaternary centre adjacent to the acetonide ester at the benzylic position is responsible for the formation of an intramolecularly reduced product in almost quantitative yield. This ster...
Article
Melanin is the pigment found in human skin that is responsible for both photo-protection and photo-damage. Recently there have been reports that greater photo-damage of DNA occurs when cells containing melanin are irradiated with UV radiation, thus suggesting that the photo-products of melanin causes DNA damage. Photo-ionization processes have also...

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Projects

Projects (2)
Project
1) To gain a deeper understanding of the Origin of Life. 2) To understand the evolution of prebiotic molecules. 3) To explore the link between terrestrial and extra-terrestrial factors leading to the emergence of Life.