A New Nitrosyl-bridged Bimetallic Nitroprusside Complex: Synthesis, Crystal Structure, Supramolecular Self-assembly and Spectral Behavior of Interactions with DNA

作者：Sun Yun Ming; Dong Feng Ying^*; Wang Da Qi; Li Yan Tuan; Dou Jian Min

来源：Journal of Inorganic and Organometallic Polymers and Materials, 2010, 20(4): 657-665.

DOI：10.1007/s10904-010-9388-z

• Nitroprusside complex
• Crystal structure
• Supramolecular self-assembly
• pi-pi stacking
• DNA binding
• Spectrum

A new nitrosyl-bridged bimetallic nitroprusside complex, [Ba(phen)(3)(H(2)O)][Fe(CN)(5)NO]center dot 1.5phen center dot 2H(2)O (phen = 1,10-phenanthroline) (1), has been synthesized and characterized by elemental analysis and single crystal X-ray diffraction. The crystal structure analysis reveals that complex 1 crystallizes in the triclinic space group PA <<. The asymmetric structural unit is comprised of one [Ba(phen)(3)(H(2)O)](2+) complex cation, one [Fe(CN)(5)NO](2-) complex anion, 1.5-uncoordinated phenanthroline molecules and two lattice water molecules. The complex ions are linked into a 1D chain-like arrangement by the trans CN and NO groups in nitroprusside. The six-coordinated Fe-atom forms a distorted octahedral coordination configuration, and the Ba-atom has a nine-coordinate monocapped antiprismatic geometry. Five types of pi-pi stacking interactions of phenanthroline and some intra- and intermolecular hydrogen bonds are observed in the 3D supramolecular self-assembly. Absorption spectroscopy, fluorescence titration and viscometry studies of the interaction between complex 1 and calf thymus DNA indicate that complex 1 is a moderate metallo-intercalator with the intrinsic binding constant of 3.70 x 10(4) M(-1) and the linear Stern-Volmer quenching constant of 5.98 x 10(4) M(-1).

• 出版日期2010-12
• 单位青岛农业大学; 中国海洋大学; 聊城大学