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BY-NC-ND 3.0 license Open Access Published by De Gruyter June 2, 2014

Darstellung und Struktur von tripod-Cobalt-Aminocarboxylato-Komplexen / Syntheses and Structure of tripod Cobalt Aminocarboxylate Complexes

Volker Sernau , Gottfried Hüttner , Martin Fritz , Bernd Janssen , Michael Büchner , Christiane Emmerich , Olaf Walter , Laszlo Zsolnai , Diethelm Günauer and Thomas Seitz

Reaction of triphos (CH3C(CH2P(Ph)2)3) with Co(II)aq(BF4)2 followed by reaction with aminoacids leads to the cationic complexes 1-6 ([triphosCoNH2CH(R)COO]+ (R = H; Gly (1), R = methyl: L-Ala (S-2), D-Ala (R-2), R = isopropyl: L-Val (3), R = N -propyl: L - Pro (4), R = phenyl: D-phenylglycine (5), R = benzyl: L - Phe (6 )), which can be isolated in good yields by crystallization as their B(Ph)4- salts. The analogous reaction of the modified tripod ligand PhCH2C(CH2P(Ph)2)3 with L-alanine leads to the complex [PhCH2C(CH2P(Ph)2)3Co(L-Ala)]+, 7. The cations 1-7 have been characterized by spectroscopic methods and their structures determined by X -ray analyses which unequivocally demonstrate pentacoordinated Co(II) centers.

Received: 1995-1-12
Published Online: 2014-6-2
Published in Print: 1995-11-1

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