Stabilities and Near UV. Charge transfer spectra of binuclear and heterobinuclear complexes of N,N′-bis-[2-(2-pyridylmethyl-amino)-ethyl]-oxamide with transition-metal ions
✍ Scribed by Urs-Peter Buxtorf; Andreas Zuberbühler
- Publisher
- John Wiley and Sons
- Year
- 1973
- Tongue
- German
- Weight
- 452 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
i t u t far anorgaiiischc Chemic, TJniversitat Bawl (9. X. 72) Szrmmary. Tlic forniation of complexes of N, ~'-bis-~2-(2-pyriclvlmethyl-amino)-ethJ;11-oxainicle (PAOH,) with Mn2+, Fez++, Coz+, Ni2+, C U ~+ ant1 Zn2+ has been stucdied potentiometrically and spectrophotometrically. Desidcs mononuclear species, PAOFI, forms the binuclear or heterobinuclcar complcxcs CU~(P,\OH,)~+, Cu,PAO2+, Zn,PX02+, CuKiPA02-k, and probably CUZIII'AO~+. Somc of thesc fivc compounds show an IJV. absorption band near 350 nm reminiscent of that of dimeric copper acetate. The results suggcst that charge transfrr from the oxarnidato group to Cu2+-is rcsponsiblt: for the near UV. absorption.
N, N'-Bis-(2-dimethylamino-ethy1)-oxamide (DEOXH,) [l]
[Z] and related compounds 131 [4] easily form binuclear copper complexes. Structure I has been verified by X-ray analysis of the dithiocyanate Cu,DEOX( SCN),. 2DMF crystallised from dimetliylformamide 1. 51. These binuclear complexes and dimeric copper acetate (Cu-Cu distance = 2.64 ) have in common: a relatively weak UV.-band near 350 nm and spin-spin interaction of the copper atoms as deduced from ESR. and magnetic susceptibility. As the properties of dimeric alkanoates have attracted considerable attention (see e g . [7] [8]), we thought it worth-while to search for ligands that would form binuclear or heterobinuclear complexes of the general structure I with metal ions other than Cu2+.