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Reaction of triphos (CH 3 C(CH 2 P(Ph) 2 ) 3 ) with Co (II)  aq (BF 4 ) 2  followed by reaction with aminoacids leads to the cationic complexes 1-6 ([triphosCoNH 2 CH(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 PhCH 2 C(CH 2 P(Ph) 2 ) 3  with L-alanine leads to the complex [PhCH 2 C(CH 2 P(Ph) 2 ) 3 Co(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.

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