Three complexes of the general formula trans/cis-[Ru^(II)(dppme)(N–N)Cl₂] {dppme is H₂C=C(CH₂PPh₂)₂ and N–N is 1,2-diaminocyclohexane (trans/cis-(1)) and 1-methyl-1,2-diaminopropane (trans-(2)} were obtained by reacting trans-[RuCl₂(dppme)₂] with an excess amount of corresponding diamine in CH₂Cl₂ as  a solvent. The complexes were characterized by an elemental analysis, IR, ¹H, ¹³C and ³¹P{1H}NMR, FAB-MS and Uv-visible. The trans-(1) (kinetic product) readily isomerizes to the cis-(1) (thermodynamic product) and this process was followed by using ³¹P{¹H} NMR, cyclic voltammetry  and UV–vis. The electrochemical studies on complex (1) reveal that the Ru(III)/Ru(II) couples are sensitive to the isomer (trans/cis) formed. The structureof cis-(1) isomer was confirmed by X-ray analysis and ³¹P{¹H} NMR. Transfer-hydrogenation reactions for reduction of trans-4-phenyl-3-butene-2-one were conducted using complexes trans/cis-(1) and trans-(2). The electronic spectra of cis/trans-(1) in dichloromethane were calculated with the use of time-dependent DFT methods.

Title

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 117, 3 January 2014, Pages 250–258

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Publisher Country

Palestine

Publication Type

Both (Printed and Online)

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Year

2014

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