Thermochromism in copper(II) complexes: thermal, spectroscopic, solid-state broadline 1H NMR and room-temperature single-crystal x-ray analysis of bis(N,N′-dimethyl-1,2-ethanediamine)copper(II) dinitrate

Koner, Subratanath ; Ghosh, Ashutosh ; Chaudhuri, Nirmalendu Ray ; Mukherjee, Alok K. ; Mukherjee, Monika ; Ikeda, Ryuichi (1993) Thermochromism in copper(II) complexes: thermal, spectroscopic, solid-state broadline 1H NMR and room-temperature single-crystal x-ray analysis of bis(N,N′-dimethyl-1,2-ethanediamine)copper(II) dinitrate Polyhedron, 12 (11). pp. 1311-1317. ISSN 0277-5387

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0277-5387(00)84321-1

Abstract

The complex bis(N,N′-dimethyl-1,2-ethanediamine)copper (II) dinitrate, Cu (NN′-dmen)2(NO3)2, undergoes a first-order thermochromic phase transition at ca 148°C, changing from blue-violet to blue. The low-temperature phase has been characterized by X-ray crystallography. The copper ion possesses distorted (4+2) octahedral geometry with two five-membered chelate rings, in the δλ conformation, forming the CuN4 plane [CuN = 2.000(6) and 2.033(7) Å] and oxygens from the two nitrate groups weakly coordinated in the two axial coordination sites [CuO = 2.506(8) Å]. The broad-line 1H NMR indicates the onset of a dynamic disorder of diamine chelate rings at the phase transition temperature region. The electronic spectrum broadens on phase transition.

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