• Rabindranath Mukherjee

Articles written in Journal of Chemical Sciences

• Dicopper complexes of relevance to tyrosinase modelling: An overview

A number of dicopper(II) complexes containing binucleating, primarily nitrogen donor ligands havingm-xylyl spacers between the coordination units of relevance to tyrosinase activity and a brief account of the recent results obtained using a new non-Schiff base binucleating ligand providing only two-nitrogen coordination at each copper centre are described in this paper. This new system exhibits tyrosinase activity. A dihydroxo-bridged copper(II) complex has also been obtained with a novel ligand assembly formed as an impurity during our desired ligand synthesis. A brief review has been presented in this field emphasising the nature of the ligand systems and the reaction conditions.

• Dicopper complexes of relevance to tyrosinase modelling: An overview

• Modelling tyrosinase monooxygenase activity. Activation of dioxygen by dicopper(I) complexes and characterisation of dicopper(II) complexes

Activation of dioxygen on dicopper(I) centres was systematically investigated using a group of open-chain and a macrocyclicm-xylyl-based dinucleating ligand from a bioinorganic viewpoint. Even though intermediate peroxodicopper(II) species was not detected (even at −80°C for the open-chain system), the putative intermediate reacted with C–H groups in ligands giving oxygenated products (C–OH groups). Absorption, spectroscopic and magnetic properties of the final dicopper(II) complexes have been investigated.

• Effect of chelate-ring over the stabilization of copper-dioxygen adducts

• Fixation of CO2 in air: Synthesis and crystal structure of a μ3-CO3-bridged tricopper(II) compound

A novel trinuclear copper(II) compound [{(L3)Cu(OClO3)}33-OCO2)][ClO4] has been synthesised using an N-tridentate symmetrical pyridylalkylamine ligand, N-methyl-N,N-bis(2-pyridylmethyl) amine (L3). The structure of the complex has been determined by X-ray crystallography; it is found to crystallise in the hexagonal space group P63/m with a = 13·936(2), b = 13·936(2), c = 14·895(3) Å, α = β = 90°, γ = 120°. The complex possesses a 6̅ symmetry axis passing through the carbon atom of the triply bridging carbonate ion, with the three symmetry related copper ions connected to one another through the oxygen atoms from the bridging carbonato group, giving an equilateral triangular array of copper centres. Each copper ion has distorted square pyramidal environment with the basal plane formed by three nitrogen atoms of the ligand L3 and the oxygen atom of the bridging carbonato group. The apical position at each copper is provided by the weak oxygen coordination from the perchlorate ion.

• Two-dimensional supramolecular networks via C-H$\cdots$Cl and N-H$\cdots$Cl interactions utilizing bidentate neutral pyridine amide coordinated MnIICl2 tectons

Reaction of 𝑁-(phenyl)-2-pyridinecarboxamide (HL1) and 𝑁-(𝑝-tolyl)-2-pyridinecarboxamide (HL2) ligands with MnCl2.4H2O affords complexes [(HL1)2MnCl2] 1 and [(HL2)2MnCl2] 2. The structures of 1 and 2 were determined by three-dimensional X-ray crystallography revealing that the MnII ions assume distorted octahedral geometry with coordination by two HL1/HL2 ligands providing two pyridine N and two amide O and two chloride ions. Notably, secondary interactions [C-H$\cdots$Cl (pyridine 3-H hydrogen) and N-H$\cdots$Cl (amide NH hydrogen)] triggered by MnII-coordinated chloride ions acting as hydrogen bonding acceptors generate self-complementary dimeric tectons, which lead to 2D supramolecular architectures.

• # Journal of Chemical Sciences

Volume 132, 2020
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• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019