Two simple biphenyl-Appended (2-pyridyl)alkylamine N-bidentate ligands, Le and Lm, having ethylene and methylene spacers between donor groups, with bite angles Le â 100° and Lm â 80°, dictate pseudotetrahedral and trigonal-bipyramidal geometries in six high-spin Ni(II)-halide complexes, [Ni(Le)X2] and [Ni(Lm)2X](ClO4) (where X = Cl-, Br-, I-), respectively. The structures in the solid state, determined using X-ray crystallography, and in solution, determined using spectroscopic methods (UV-vis-NIR and paramagnetic 1H NMR), which complement each other, are described. © 2017 American Chemical Society.

Narasimha N. Murthy

Department Of Chemistry

Divya Sasi

Venkatachalam Ramkumar

Fulltext

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

ACS Omega

Two new bis- and mono-tridentate chelated iron complexes, [FeII(LH)2](ClO4)2·C2H5OH (1) and [FeIII(LH)Cl3]·0.5CH2Cl2 (2), with facially capping N-tridentate ligand, 2-(5,7-dihydro-6H-dibenzo[c,e]azepin-6-yl)-N-(pyridin-2-ylmethyl)ethan-1-amine, incorporating biphenyl-append (LH), have been synthesized and characterized by X-ray crystal structure, spectroscopic (FTIR, UV–Vis and ESI-MS) and magnetic susceptibility measurements. Structure of 1 reveals pseudo-octahedral geometry around Fe(II) with two ligands (LH) arranged in trans-facial manner, in two crystallographic independent molecules, Mol. A and Mol. B, differing in biphenyl twist angles, ϕ = 43.7° and 45.1°. Complex 2 has similar geometry with Fe(III) having one facially capping ligand, LH and three chlorides (Cl−), also in two crystallographic independent molecules, Mol. A and Mol. B, differing by biphenyl twist angles, ϕ = 40.9° and −42.7°. The UV–Vis absorption spectrum of 2 in CH3CN suggests competitive coordination between the two weakly-coordinating tertiary amine nitrogen atoms having biphenyl-append, and the solvent, CH3CN. The qualitative magnetic susceptibility measurements for 1 and 2 at 296 K provide moments of 4.2 μB and 2.7 μB, respectively, suggesting nearly high-spin, Fe(II) (S = 2) and a rare intermediate-spin, Fe(III) (S = 3/2). © 2018 Elsevier Ltd

Polyhedron

Bis- and mono-tridentate chelated iron complexes with a new facially capping unsymmetrical nitrogen ligand: X-ray structural and spectroscopic studies

Facile hydrolysis of a phosphodiester promoted by a dicopper bis(μ-hydroxo) complex containing a new biphenyl appended N-bidentate ligand led to the isolation of the first example of hexameric copper pyrophosphate through 'in situ self assembly'. © 2009 The Royal Society of Chemistry.

Chemical Communications

First hexanuclear copper(ii) pyrophosphate through hydrolysis of phosphodiester with a dicopper complex

Chemistry - A European Journal

Spectroscopically Characterized Synthetic Mononuclear Nickel-Oxygen Species

Chemical Reviews

Distortion Pathways of Transition Metal Coordination Polyhedra Induced by Chelating Topology

Journal of the American Chemical Society

Two-Electron HCl to H2 Photocycle Promoted by Ni(II) Polypyridyl Halide Complexes

A Robust Ni(II) α-Diimine Catalyst for High Temperature Ethylene Polymerization

Bite-Angle-Regulated Coordination Geometries: Tetrahedral and Trigonal Bipyramidal in Ni(II) with Biphenyl-Appended (2-Pyridyl)alkylamine N,N′-Bidentate Ligands

Journal	Data powered by TypesetACS Omega
Publisher	Data powered by TypesetAmerican Chemical Society
ISSN	24701343
Open Access	Yes