Cyano-bridged Molecular Square: [Ni(iprtacn)Fe(phen)<sub>2sub>(CN)<sub>2sub>]<sub>2sub>(PF<sub>6sub>)<sub>4sub>·6CH<sub>3sub>CN - Preparation, Structure, Magnetic Properties and Binding with DNA
文摘
The cyano-bridged molecular square Ni(iprtacn)]<sub>2sub>[Fe(phen)<sub>2sub>(CN)<sub>2sub>]<sub>2sub>(PF<sub>6sub>)<sub>4sub>·6CH<sub>3sub>CN (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 Ni<sup>IIsup>Fe<sup>IIsup>Ni<sup>IIsup>Fe<sup>IIsup> 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<sup>–1sup>. UV/Vis and fluorescence spectra show that the complex is able to displace DNA-bound EB and bind to DNA with strong interactions.