Synthesis, characterization and crystal structure of the first trinuclear MFe2(M = Cu and Ni) complexes based on nitroprusside

✍ Scribed by Bei-Chuan Zhou; Hui-Zhong Kou; Yong Li; Ming Xiong; Ru-Ji Wang

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 437 KB
• Volume: 21
• Category: Article
• ISSN: 0256-7660
• DOI: 10.1002/cjoc.20030210911

✦ Synopsis

Three new complexes [ Ni ( H2L ) ] [ Fe( CN 15 (NO 12 * 6H20 ( 1 , [Ni( HzL) ] [ Fe ( CN (NO)]z 4H20 (2) and [ Cu ( HzL) 1 [ Fe-(CN)s(NO) ]2*4H20 ( 3 ) ( L = 3,lO-bis ( 2-aminoethyl)-l, 3 , 5 , 8,lO112-hexaazacyclotetradecane) are prepared and characterized by IR, elemental analyses and single-crystal X-ray analyses, indicating that they are the first examples of trinuclear nitroprusside-bridged W e z (M = Cu and Ni) complexes. In the three complexes, the central metal atoms (M) are all six-coordinated by the nitrogen atoms from the macrocyclic ligand and two cyano-bridges at the trans-positions to form distorted octahedral confrprations. The axial N-M-N linkage is nearly vertical to the equatorial plane defined by four coordinating N atoms of macrocyclic ligand. The CGN-Ni bond angle of 172.6" in compleox 1 is apparently larger than those in complexes 2 and 3 ( 152.57" and 136.37'. respectively) . The three complexes are all connected by hydrogen bonds into 3D networks.

This study shows that the cyano-bridged trinuclear species could be generated via the control of the charge of the building blocks.