Metallkomplexe mit biologisch wichtigen Liganden, LXVIII. Metallorganische Asparaginato‐Cobaltkomplexe als Liganden für Alkali‐Ionen

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Abstract
Metal Complexes of Biologically Important Ligands, LXVIII[1]. – Organometallic Asparaginato Cobalt Complexes as Ligands for Alkaline IonsThe trischelate complexes of the dianion of aspartic acid and β‐methylaspartic acid (η5‐C5Me5) magnified image ] (R = H, Me) form adducts with alkali iodides MI (M = Li, Na, K). The polymeric structure of (η5‐C5Me5)Co(L‐asp.–2H+)KI (1c) was determined by X‐ray diffraction. In the crystal of 1c the potassium ions are surrounded by five oxygen atoms of the carboxylate groups whereby two oxygen atoms form bridges between two K+ ions. Similarly, trischelate complexes 4 and 5 have been obtained from (η5‐C5Me5)Co(CO)I2 and 2,3‐diaminopropionic, 2,4‐diaminobutyric acid, and asparagine, respectively.

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