Mrituanjay D Pandey

Indian Institute of Technology Kanpur, Kānpur, Uttar Pradesh, India

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Publications (13)32.09 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: The sequential reaction of a phosphorus-based trishydrazone ligand, LH3 with anhydrous ZnCl2 and LnCl3·6H2O in a 2 : 2 : 1 stoichiometric ratio in the presence of triethylamine as the base leads to the formation of monocationic trinuclear complexes [L2Zn2Ln]Cl {Ln = Gd (), Tb (), Nd (), Eu () and L = [(S)P[N(Me)N[double bond, length as m-dash]CH-C6H3-2-O-3-OMe]3}. All the three metal ions, in each of these compounds, are arranged in a linear fashion. The two terminal Zn(ii) ions are encapsulated by three imino and three phenolate oxygen atoms while the lanthanide ion remains in the centre with an all-oxygen coordination environment. Detailed photophysical measurements reveal the complete absence of antenna sensitization in all the four complexes. However, a strong emission was found for and when excited directly at their f-f levels.
    Dalton Transactions 09/2013; · 3.81 Impact Factor
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    ABSTRACT: Various phosphorus-supported fluorescent probes have been synthesized by the condensation reaction of multi-functional phosphorus hydrazides with various fluorophore-containing carboxaldehydes. Compounds, thus prepared, in this study are (PhO)2P(O)[N(Me)–NCH–R] (1a, 1b), Ph2P(O)[N(Me)–NCH–R] (2b, 2c, 2d), PhP(O)[N(Me)–NCH–R]2 (3b, 3c), P(S)[N(Me)–NCH–R]3 (4b, 4c), P(O)[N(Me)–NCH–R]3 (5a, 5b, 5c), N3P3(O2C12H8)2[N(Me)–NCH–R]2 (6a, 6b, 6c), N3P3(O2C12H8)[N(Me)–NCH–R]4 (7a, 7b, 7c, 7d) and N3P3[N(Me)–NCH–R]6 (8b, 8c), where R=1-pyrenyl (a), 9-anthracenyl (b), 9-phenanthryl (c) and 7-(N,N′-diethylamino)-3-coumarinyl (d). All of these compounds have been characterized by various analytical techniques including 31P{1H} NMR spectroscopy. Compounds 1b, 2b, 3b, 4b, 5b, 5c and 6d have also been characterized by single crystal X-ray analysis. All of these phosphorus-supported compounds exhibit excellent fluorescence properties in aqueous solution at near physiological conditions.
    Tetrahedron 07/2011; · 2.80 Impact Factor
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    ABSTRACT: The reaction of the phosphorus trihydrazide, (S)P[N(Me)-NH(2)](3) (1) with quinoline-2-carboxaldehyde (C(9)H(6)N-2-CHO) in a 1:3 ratio afforded a trishydrazone, (S)P[N(Me)-N=CH-2-C(9)H(6)N](3) (2). Crystals of 2 were grown in three different solvent media affording an unsolvated (2, monoclinic, P2(1)/n) and two solvated (2·3H(2)O, trigonal, R3 and 2·2CH(3)OH, triclinic, P ̅1) crystal forms. Each of these, while possessing an essentially similar molecular structure, adopt different crystal packing giving rise to supramolecular structures mediated by a variety of weak interactions: O-H-N, O-H-O, C-H-N, C-H-O, C-H-S, C-H-π, π-π, N-π and S-π. The reaction of 2 with Ag(ClO(4))(2)·6H(2)O in methanol afforded a dinuclear cationic cage [Ag{(S)P[N(Me)-N=CH-2-C(9)H(6)N](3)}·ClO(4)](2) (3). The molecular structure of 3 reveals a dimeric structure consisting of two Ag(I) ions that are held together by two ligands. Only two arms of the tris hydrazone ligand are involved in coordination while an unprecedented P=S→Ag(I) coordination is seen. This results in the formation of an Ag(2)S(2) dimer that is encapsulated by two trishydrazone ligands. Both compounds 2 and 3 are photoluminescent.
    Dalton Transactions 07/2011; 40(31):7873-8. · 3.81 Impact Factor
  • Chemistry - An Asian Journal 07/2011; 6(9):2246-50. · 4.57 Impact Factor
  • Vadapalli Chandrasekhar, Mrituanjay D. Pandey
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    ABSTRACT: A novel dipyrene ligand 1 has been designed which shows intramolecular excimer formation in solution. Its specific interaction with Cu2+ or Hg2+ leads to the disruption of the excimer and results in a fluorescence-mediated sensing of these ions in a mixed organic-aqueous solution. Apart from steady-state studies, time-resolved fluorescence measurements also reveal that excimer-switch off caused by metal ion coordination leads to the selective detection of these ions.
    Tetrahedron Letters 04/2011; 52(16):1938–1941. · 2.40 Impact Factor
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    ABSTRACT: A phosphorus-supported fluorescent probe N 3 P 3 (O 2 C 12 H 8) 2 [N(Me)N=CHR] 2 (RCHO = 7-diethylamino-coumarin-3-aldehyde) has been synthesized by the condensation of gem-N 3 P 3 (O 2 C 12 H 8) 2 [N(Me)NH 2 ] 2 with 7-diethylamino-coumarin-3-aldehyde. This compound has been shown to be an excellent fluorescence-based chemosensor of Cu 2+ and Ag + ions in aqueous solution. In recent years, there has been an increased research interest in the development of fluorescent chemosensors 1-3 that show high specificity and selectivity towards the detection of metal ions. The design of chemosensors consists of incorporating them with suitable binding sites and signaling subunits. Interaction of the binding sites with metal ions should result in a detectable response in the signaling unit such as change in fluorescence emission intensity (for a fluorescence-based chemosensor). Chemosensors based on changes in fluorescence emission are of particular interest in view of the good detection limits that can be achieved using this technique. Several types of fluorescence-based chemosensors for various types of metal ions are known in literature 4-8 . We have been working on phosphorus-supported ligand systems for some time now 9 . For example, using (S)P[N(Me)N=CHC 6 H 4 –2-OH] 3 (LH 3) we were able to assemble novel neutral trinuclear derivatives (L 2 M 3) using divalent metal ions 10 . On the other hand, using trivalent metal ions afforded mononuclear compounds. 10 Modification of the ligand to (S)P[N(Me)N=CH-C 6 H 4 –2-OH–3-OMe] 3 allowed us to prepare several 3d–4f assemblies 11 , some of which were shown to possess interesting magnetic properties including single-molecule magnet behaviour 12 . More recently we have also shown that this ligand design could be further modulated such that their metal complexes possessed third-order NLO properties 13 .
    Indian Journal of Chemistry Section a 04/2011; 50:453-458. · 0.79 Impact Factor
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    ABSTRACT: This Communication describes a novel adenine-pyrene conjugate (1) and its solid-state structure with silver and copper ions. Single-crystal studies of metal complexes of 1 offer insight into molecular interactions and provide a basis to rationalize possible interactions in the solution state, leading to excimer formation. The robust nature of this interaction was further confirmed by deposition of the silver complex on a graphite surface, which exhibited a remarkable resemblance to its solid-state structure. The structural basis of selective excimer formation in the presence of Ag(+) ions presents a viable approach for ratiometric detection of these ions.
    Inorganic Chemistry 03/2010; 49(5):2020-2. · 4.59 Impact Factor
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    ABSTRACT: A phosphorus-supported multidentate ligand (S)P[N(Me)N=CH-C(6)H(3)-2-OH-4-N(CH (2)CH(3))(2)](3) (1) has been used to prepare mononuclear complexes LM [M = Fe (2) Co (3)] and trinuclear complexes L(2)M(3) [M = Mn (4), Ni (5), Zn (6), Mg (7), Cd (8)]. In both 2 and 3 the ligand binds the metal ion in a facial coordination mode utilizing three imino nitrogen (3N) and three phenolic oxygen (3O) atoms. The molecular structures of L(2)Mn(3), L(2)Ni(3), L(2)Zn(3), L(2)Mg(3), and L(2)Cd(3) (4-8) are similar; two trihydrazone ligands are involved in coordination to hold the three metal ions in a linear fashion. Each of the trishydrazone ligands behaves as a trianionic hexadentate ligand providing three imino and three phenolic oxygen atoms for coordination to the metal ions. The coordination environment around the two terminal metal ions is similar (3N, 3O) while the central metal ion has a 6O coordination environment. Third-order non-linear optical properties of these compounds as measured by their two-photon absorption (TPA) cross section reveals that while 1 does not possess obvious TPA activity, complexes 2 (3213 GM) and 4 (3516 GM) possess a large TPA cross section at 770 nm.
    Inorganic Chemistry 03/2010; 49(9):4008-16. · 4.59 Impact Factor
  • Vadapalli Chandrasekhar, Arun Kumar, Mrituanjay D. Pandey
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    ABSTRACT: Unsymmetrical diorganotellurium(IV) dihalides, Ar′(Ar)TeCl2 [Ar′=2-(R-CHN-C6H3Me; R=1-pyrenyl, 9-anthracenyl and 9-phenanthrenyl; Ar=4-MeO-C6H4, 1-C10H7, 2,4,6-Me3-C6H2, C6H5, 4-Me-C6H4] were synthesized from transmetallation reactions of Ar′HgCl and ArTeCl3. Orthomercuration of the Schiff’s bases (Ar′H) afforded Ar′HgCl. All of these compounds have been characterized with the help of IR, multinuclear (1H, 13C) solution NMR and ESI-HRMS spectrometry. X-ray crystal structures of pyrenyl Ar′HgCl; pyrenyl Ar′(Ar)TeCl2 (Ar=4-MeO-C6H4); anthranyl Ar′(Ar)TeCl2 (Ar=4-MeO-C6H4 and 1-C10H7) and; phenathranyl Ar′(Ar)TeCl2 (Ar=1-C10H7) have been determined. Intramolecular Hg/Te⋯N interactions are present in these structures. Fluorescence studies of these compounds have also been carried out.
    Journal of Organometallic Chemistry - J ORGANOMET CHEM. 01/2010; 695(1):74-81.
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    ABSTRACT: A modular ligand design allowed the assembly of four phosphorus-supported pyrene-containing ligands. The number of pyrene arms could be varied from 1 to 6 depending on the phosphorus support. While ligands containing one and three pyrene arms are excellent fluorescence-based sensors of Cu2+, the ligand containing two pyrene arms shows a high specificity for Mg2+.
    Tetrahedron. 01/2009; 65(23):4540-4546.
  • Vadapalli Chandrasekhar, Prasenjit Bag, Mrituanjay D. Pandey
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    ABSTRACT: Phosphorus hydrazides PhP(O)[N(Me)NH2]2, (S)P[N(Me)NH2]3, and N3P3[N(Me)NH2]6 were condensed with 7-diethylaminocoumarin-3-aldehyde (RCHO) to afford the corresponding hydrazones PhP(O)[N(Me)NCHR]2 (1), (S)P[N(Me)NCHR]3 (2), and N3P3[N(Me)NCHR]6 (3). The structural characterization of 1–3 was carried out by their HRMS, 1H and 31P{1H} NMR spectra. The molecular structure of 2 was established by a single-crystal X-ray analysis. Interaction of 1 and 2 with various transition metal ions revealed substantial fluorescence enhancement upon interaction with Cu2+ enabling a selective detection mechanism for this metal ion. However, such a fluorescence enhancement was not observed in the case of 3. A 1:1 complex [2·Zn][ClO4]2·4CH2Cl2 was isolated in the reaction of 2 with Zn(ClO4)2·6H2O. The molecular structure of this complex revealed that the ZnII is encapsulated by the ligand utilizing a 3N, 3O coordination set.
    Tetrahedron. 01/2009; 65(47):9876-9883.
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    ABSTRACT: Modification of important physicochemical properties of aqueous surfactant solutions can be achieved by addition of environmentally benign room temperature ionic liquids (ILs). While low aqueous solubility of "hydrophobic" ILs limits the amount of IL that may be added to achieve desired changes in the physicochemical properties, hydrophilic ILs do not have such restrictions associated to them. Alterations in the key physicochemical properties of aqueous solutions of a common nonionic surfactant Triton X-100 (TX100) on addition of up to 30 wt % hydrophilic IL 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) are reported. The presence of micellar aggregates in as high as 30 wt % [bmim][BF4]-added aqueous TX100 solutions is established by dynamic light scattering and fluorescence probe behavior. Increasing the concentration of [bmim][BF4] results in decrease in average micellar size and aggregation number and increase in critical micelle concentration, indicating an overall unfavorable aggregation process. Increase in the dipolarity and the microfluidity of the probe cybotactic region within the palisade layer of the micellar phase upon [bmim][BF4] addition implies increased water penetration and the possibility of TX100-[bmim][BF4] interactions. While the changes in some of the physicochemical properties indicate the role of [bmim][BF4] to be similar to a cosurfactant, the IL acts like a cosolvent as far as changes in other properties are concerned. Effectiveness of IL [bmim][BF4] in modifying physicochemical properties of aqueous TX100 is demonstrated.
    The Journal of Chemical Physics 12/2007; 127(18):184501. · 3.16 Impact Factor
  • Maroof Ali, Abhra Sarkar, Mrituanjay D Pandey, Siddharth Pandey
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    ABSTRACT: The addition of only approximately 1.7 wt% (approximately 0.06 M) ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate to aqueous solutions of six popular cationic dyes resulted in the precipitation of almost all of the dye from the solution.
    Analytical Sciences 09/2006; 22(8):1051-3. · 1.57 Impact Factor