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Synthesis and X‐ray Crystal Structure of Bis[oxamide dioximato‐κ 2 N , N′ ](oxamide dioxime‐κ 2 N , N′ )cobalt(III) Perchlorate Hexahydrate
Author(s) -
Bélombé Michel M.,
Nenwa Justin,
Lönnecke Peter,
HeyHawkins Evamarie
Publication year - 2009
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200801252
Subject(s) - oxamide , chemistry , cobalt , deprotonation , crystal structure , molecule , inorganic chemistry , ion , crystallography , salt (chemistry) , ionic bonding , medicinal chemistry , stereochemistry , organic chemistry
Co(OAc) 2 reacts with oxamide dioxime (H 2 oxado) in water in the presence of ClO 4 – ions to produce [Co(Hoxado) 2 (H 2 oxado)]ClO 4 · 6H 2 O ( 1 ), where Hoxado – is the anion of H 2 oxado, derived from the deprotonation of one of the two hydroximinic groups, and in which oxidation of Co II to Co III (in air) had occurred. 1 is the first example of a salt in which the cation, [Co(H 2 oxado) 3 ] 3+ , is doubly deprotonated to generate the chiral cation, [Co(Hoxado) 2 (H 2 oxado)] + . The central cobalt cation is pseudo‐octahedrally coordinated by six nitrogen atoms. In the solid state, the complex cations form centro‐symmetric dimers via O–H ··· O bridges. The bulk structure is consolidated by an extended three‐dimensional network of O–H ··· O and N–H ··· O bridges that interconnect the ionic constituents and the water molecules.