Cis/trans-isomerism of complexes RuCl2(S-dmso)tpy), tpy = terpyridine ligand
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Zeitschrift fuer Anorganische und Allgemeine Chemie 631 (2-3): 491--495 (2005)

The mol. structure of the precursor compd. trans-RuCl2(DMSO)(terpy) for Ru(terpy)2+ contg. complexes was detd. for the trihydrate (terpy = 2,2':6',2\dq-terpyridine) (triclinic, P1̅, a 8.6232(17), b 8.6723(17), c 14.274(3) \AA, a 93.09(3), b 94.69(3), g 108.18(3)°, Z = 2, dc = 1.772, 5436 independent reflections, 337 refined parameters, R1 = 0.0366, wR2 = 0.0844 ( I \textgreater 2s(I))). The mol. exhibits S-bonded DMSO with the S:O bond in the Ru(h3-terpy) plane and axially positioned chloride ligands. Electrochem. studies of the cis/trans reaction product mixt. in CH2Cl2 showed 2 oxidn. processes for the reversible Ru(II)/(III) transitions but irreversible redn. Only one reversible oxidn. wave and a uniform 1H-NMR spectrum were obsd. for the isolated product in case of the related RuCl2(dmso)(mtpy) (mtpy = 4'-(4-methylphenyl)-2,2':6',2\dq-terpyridine), the electrochem., NMR and S:O vibrational stretching values allowed us to identify this product as the trans isomer. on SciFinder(R)
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