Cyano-bridged Molecular Square: [Ni(iprtacn)Fe(phen)2(CN)2]2(PF6)4·6CH3CN - Preparation, Structure, Magnetic Properties and Binding with DNA
文摘
The cyano-bridged molecular square Ni(iprtacn)]2[Fe(phen)2(CN)2]2(PF6)4·6CH3CN (1) (iprtacn = 1,4,7-triisopropyl-1,4,7-triazacyclononane, phen = 1, 10-phenanthroline) was prepared and its crystal structure, magnetic properties, and binding with DNA were characterized. The four metal ions NiIIFeIINiIIFeII of the complex 1 are almost coplanar. Magnetic susceptibilities measured over the range of 2–300 K show weak antiferromagnetic interactions between the two nickel(II) ions; best fitting for the experimental data leads to J = –1.27 cm–1. UV/Vis and fluorescence spectra show that the complex is able to displace DNA-bound EB and bind to DNA with strong interactions.