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Self‐Assembly and Structure of Cobalt(II) Complexes Using Diaminodiamide Ligands
Author(s) -
Chao MinShiun,
Lu HorngHwa,
Tsai MingLiao,
Hsieh TsungHsuan,
Lin ChienMin
Publication year - 2009
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200900135
Subject(s) - chemistry , moiety , crystallography , cationic polymerization , cobalt , octahedron , ligand (biochemistry) , hydrogen bond , crystal structure , stereochemistry , octahedral molecular geometry , coordination geometry , molecule , inorganic chemistry , biochemistry , receptor , organic chemistry
The self‐assembly of Co(II) with two diaminodiamide ligands, 4,7‐diazadecanediamide and 4,8‐diazaundecanediamide, gave two different crystals, [(C 8 H 18 N 4 O 2 )Co(OH) 2 Co(C 8 H 18 N 4 O 2 )]Cl 2 ( 1 ) [Co(C 9 H 20 N 4 O 2 )(Cl)(H 2 O)]·Cl·2H 2 O ( 2 ). Structures of 1 and 2 were characterized by single‐crystal X‐ray diffraction analysis. Structural data for 1 shows a novel type of binuclear complex with distorted octahederal coordination geometry around the Co atoms through the hydroxo bridges. By using inter‐connector N‐H···N hydrogen bonding interactions as building forces, each cationic moiety [(C 8 H 18 N 4 O 2 )Co(OH) 2 Co(C 8 H 18 N 4 O 2 )] 2+ is linked to neighboring ones, producing a charged hydrogen‐bonded 1D chain‐like structure. The chains are further connected into a 2D layer in a (4,4)‐topology via N‐H···Cl free hydrogen‐bonding interactions. Structural data for 2 indicate that the cobalt atom adopts a six‐coordinated N 2 O 4 environment, giving a distorted octahedral geometry, where two N‐ and two O‐donor sets of ligand located at equatorial positions and one water and one chloride occupied at axial positions. Through NH···Cl‐Co and OH···Cl‐Co contacts, each cationic moiety [Co(C 9 H 20 N 4 O 2 )(Cl)(H 2 O)] + in 2 is linked to neighboring ones, producing a charged hydrogen‐bonded 1D chainlike structure. Thus, the crystal‐engineering approach has proved successful in the solid‐state packing due to steric strain effect of the diaminodiamide ligand.