Sophia University

About: Sophia University is a education organization based out in Tokyo, Japan. It is known for research contribution in the topics: Nonlinear system & Catalysis. The organization has 4986 authors who have published 7657 publications receiving 106567 citations. The organization is also known as: Jōchi Daigaku.

A Novel DNA Helical Wire Containing HgII-Mediated T:T and T:G Pairs

Abstract: Numerous applications of metal-mediated base pairs (metallo-base-pairs) to nucleic acid based nanodevices and genetic code expansion have been extensively studied. Many of these metallo-base-pairs are formed in DNA and RNA duplexes containing Watson-Crick base pairs. Recently, a crystal structure of a metal-DNA nanowire with an uninterrupted one-dimensional silver array was reported. We now report the crystal structure of a novel DNA helical wire containing HgII -mediated T:T and T:G base pairs and water-mediated C:C base pairs. The Hg-DNA wire does not contain any Watson-Crick base pairs. Crystals of the Hg-DNA wire, which is the first DNA wire structure driven by HgII ions, were obtained by mixing the short oligonucleotide d(TTTGC) and HgII ions. This study demonstrates the potential of metallo-DNA to form various structural components that can be used for functional nanodevices.

Reactions of [RuCl2(NO)(terpy)]+ (terpy = 2,2′ : 6′,2″-terpyridine) with mono anions such as NO2−, Br− and N3−, and structural studies on terpyridineruthenium having a nitrosyl ligand

Abstract: [RuCl2(NO)(terpy)]PF6 ([1]PF6) has been synthesized by the reaction of K2[RuCl5(NO)] with terpy and characterized by single-crystal X-ray crystallography. [1]PF6 has a structure in which the two chloro ligands are located trans to each other with the nitrosyl ligand on the plane of the terpy ligand. Reactions of [1]PF6 with mono anions such as NO2−, Br− and N3− have been investigated. Its reactions with NO2− in H2O and CH3OH afford nitrosylterpyridineruthenium complexes, [Ru(OH)(NO2)(NO)(terpy)]PF6 ([2]PF6) and [RuCl(OCH3)(NO)(terpy)]PF6 ([3]PF6), respectively, whose geometrical configurations differ from that of [1]+. The Br−-substituted complex of [1]+, [RuBr2-(NO)(terpy)]PF6 ([4]PF6), and two solvated complexes, [RuCl2(CH3CN)(terpy)] ([5]) and [RuCl(CH3CN)2(terpy)]PF6 ([6]PF6), have been formed in its reactions with Br− and N3−. Structures of [2]PF6, [3]PF6 and [4]PF6 have been determined by singal-crystal X-ray crystallography and compared with each other.