X-irradiation of single crystals of several tri-coordinated Cu(I) monomer and dimer complexes studied by EPR revealed that Cu(I) monomer complexes form Cu(II) complexes while X-irradiation of the Cu(I) dimer complexes has no such effect. The formation of Cu(II) complexes is attributed to the addition of a radiogenic atom on the Cu(I) precursor. The absence of any structural changes due to the X-irradiation of the Cu(I) dimer complexes is discussed based on the electronic structure of these complexes.

Sundara Ramaprabhu

Department Of Physics

copper complex

copper ion

dimer

monomer

analytic method

article

conformational transition

Crystal Structure

electron spin resonance

molecular model

structure analysis

X IRRADIATION

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Electron paramagnetic resonance study of X-irradiated tri-coordinated copper(I) complexes

Journal of Molecular Structure

X-Ray irradiation of a single crystal of chlorobis(l-isopropylimidazolidine-2-thione)copper(i) led to the formation of two copper(n) species whose structures were studied by EPR spectroscopy. The EPR parameters provide information on the structural changes which characterize the formation of the four-co-ordinated copper(n) species when the three-co-ordinated copper(i) precursor reacts with radiogenic radicals formed during the irradiation and provide insight into the reaction mechanism. ©The Royal Society of Chemistry 2000.

Journal of the Chemical Society, Dalton Transactions

Four-co-ordinated copper(II) species obtained by X-ray irradiation of a three-co-ordinated copper(I) complex: A single crystal EPR study

Twenty-five inclusion complexes formed by bis(N-alkylimidazolidine-2-thione)cuprous halides with the small, chlorine-containing guest molecules CCl4, CHCl3, CH2CA2, CH3CCl3 or C2H2Cl2, have been prepared. Their 63Cu and 35Cl NQR spectra have been measured over the temperature range 77-300 K. For the corresponding bromides the 79Br and/or 81Br spectra have also been investigated. The studies reveal the number and symmetry of different inclusion site. The onset of rapid reorientation of the guest molecules is indicated by the fading out of their NQR signals between 77 and 300 K, whereas the resonances from the host molecules usually persist throughout this temperature range. However, as evidenced by discontinuities in the temperature-dependence of the NQR frequencies of the hosts, sixteen of the complexes show one or more phase-changes in this temperature-range.

Fulltext

Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences

An NQR study of inclusion compounds formed between small chlorine-containing molecules and bis(N-alkylimidazolidine-2-thione)Cu(I) halide complexes

Bis(N-methylimidazolidinethi-2-one)copper(I) chloride has been synthesized and its crystal structure determined. X-Irradiation of a single crystal of this compound leads to the formation of a CuII complex which was studied by EPR: it was shown that this species results from the addition of a radiogenic Cl atom on the CuI precursor. The structural changes induced by this reaction are revealed by the g-tensor and by the hyperfine tensors of one copper and two chlorine nuclei. The structure of this S2Cl2Cu type complex was compared with other sulfur- or chlorine-containing CuII complexes.

Journal of the Chemical Society, Faraday Transactions

Oxidation of a tricoordinated CuI complex to a tetracoordinated CuII species. A single-EPR study

Copper-63 nuclear quadrupole resonance frequencies and molecular geometries of three-co-ordinate complexes of copper(I) halides with N-alkylimidazolidinethione and thiazolidinethione ligands

Inorganica Chimica Acta

NQR studies of polyhalocuprate(I) anions

Zeitschrift für Naturforschung A

Crystal Structure and NQR of Two Copper (I) Complexes of 4,6-Dimethylpyrimidine-2-thione

Journal	Journal of Molecular Structure
ISSN	00222860
Open Access	No