Fine‐Tuning of Linear Hexa‐Cobalt and Defective Penta‐Cobalt Metal‐String Complexes
作者： Geng-Min Lin , Marc Sigrist , Er-Chien Horng , Chun-hsien Chen , Chen-Yu Yeh
关键词:
摘要: The ligand, 2, 7-bis(α-5-phenylpyrazinamino)-1, 8-naphthyridine (H2bphpzany), was synthesized by the reaction of 7-dichloro-1, with 2-amino-5-phenylpyrazine in presence potassium tert-butoxide under palladium(0)-catalyzed conditions. Linear defective penta-cobalt metal-string complex [Co5(bphpzany)4(NCS)2] (1) and hexa-cobalt Co611+ [Co6(bphpzany)4(NCS)2](PF6) (2) each containing four bphpzany2– ligands were synthesized, their structure determined using single-crystal X-ray diffraction. 1 consists two lantern-type dinuclear Co2 fragments at terminal positions one rare octacoordinated cobalt center forming a linear [Co2···Co···Co2] chain. magnetic susceptibility measurement shows quartet ground state significant spin-orbital contribution central CoII ion. Complex 2 configuration wrapped its reveals two-stages behavior spin-states S = 1/2 K, 3/2 300 K. cyclic voltammograms display three redox waves E1/2 +0.97, +0.71 –1.02 V for 1, +1.32, +0.99, +0.64, –0.14 respectively. values single-molecular resistance are 15.5 (±4.84) 16.1 (±10.4) MΩ,
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