BITS Faculty Publications
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Item Synthesis and Single-Crystal Structure of an Unusual Heptacoordinate Cadmium(II) Complex, [Cd(medien)(NO3)2] (medien = bis(2-aminoethyl)methylamine).(ACTA, 1998) Laskar, Inamur RahamanMolecular geometry and coordination number play the key role in exploring the chemistry of a coordination compound.Item Synthesis, Characterization and Thermal Studies of Bis(2-aminoethyl)methylamine(medien) Complexes of Cadmium(II). Single Crystal Structure of Cd(medien)I2.(ACTA, 1998) Laskar, Inamur RahamanThe synthesis and characterization of bis complexes of bis(2-aminoethyl) amine (dien) with transition and non transition metals are of interest as these complexes can potentially exist in three isomeric formsItem First structural characterisation of nitro–nitrito linkage isomers of nickel(II): synthesis and single crystal structures of [NiL2(NO2)2] and [NiL2(ONO)2] [L = 1-(2-aminoethyl)piperidine](RSC, 1998) Laskar, Inamur RahamanThe linkage isomers trans-bis[1-(2-aminoethyl)piperidine]dinitronickel(II) (brown) 1 and trans-bis[1-(2-aminoethyl)piperidine]dinitritonickel(II) (blue) 2 have been synthesized and characterised by X-ray single crystal structure analysis.Item Synthesis of s-fac/mer bis(N2-methyldiethylenetriamine, L) nickel(II): X-ray single crystal structures of s-fac[NiL2](NO3)2 and mer[NiL2](CF3CO2)2(Springer, 1999-06) Laskar, Inamur Rahaman[NiL2](NO3)2 (1) and [NiL2](CF3CO2)2 (2) (L = N2-methyldiethylenetriamine] have been synthesized and their X-ray single crystal structures have been determined. The triamines are ligated to NiII s-facially in (1) and meridionally in (2), with a NiN6 chromophore in each complex.Item One-pot synthesis of strong solid state emitting mono-cyclometalated iridium(iii) complexes: study of their aggregation induced enhanced phosphorescence(RSC, 2012) Laskar, Inamur RahamanStrong solid-state greenish-blue emitting, mono-cyclometalated iridium complexes, [Ir(ppy)(PPh3)2(H)(Cl)], 2a and [Ir(F2ppy)(PPh3)2(H)(Cl)], 2b [ppyH = 2-phenylpyridine; F2ppyH = 2-(2′,4′-difluoro)phenylpyridine], have been synthesized by a convenient route. The ‘aggregation induced enhanced phosphorescence (AIEP)’ activity exhibited by these complexes has been rationalized.Item Synthesis of an aggregation-induced emission (AIE) active salicylaldehyde based Schiff base: study of mechanoluminescence and sensitive Zn(ii) sensing(RSC, 2017) Laskar, Inamur RahamanSyntheses of multi-functional Aggregation-Induced Emission (AIE) active molecules in a simple manner have been drawing great attention in current luminescence materials research. In this report a simple diamine molecule (N1-tritylethane-1,2-diamine(1)) is reacted with salicylaldehyde using a Schiff-base technique which results in a new AIE active organic molecule [2-((2-(tritylamino)ethylideneamino)methyl)phenol (2)]. Computational calculations support that the nature of the transition is intra-molecular charge transfer/twisted intramolecular charge transfer (ICT/TICT). The mechanism of AIE has been attributed to restricted intramolecular rotation (RIR). Packing diagrams support that the nature of the aggregation is J-aggregation. The compound, 2, exhibits an irreversible mechanoluminescence (ML) property with a drastic colour change from blue to green (λmax, 445 nm → 512 nm) upon grinding. However, it undergoes a reversible transition with the same colour change (blue → green) through applying pressure axially (using a hydraulic press). The reversible transition is observed by lowering the temperature of 2 to that of liquid nitrogen. The causes of such transitions showing variations in the emission colour upon different triggers have been investigated. In addition, 2 has been successfully tested for the sensing of Zn(II) and shows a rare turn-on luminescence change, the mechanism behind which has been explored. The detection limit for Zn(II) is determined to be 0.064 ppm.