Institution: | a Research Institute for Science and Technology, Kinki University, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan b Department of Chemistry, Kinki University, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan |
Abstract: | Two novel tetracopper(I) and tetrasilver(I) complexes Cu4(atdz)6](ClO4)4·2CH3OH (1) and Ag4(atdz)6](ClO4)4 (2), have been prepared using 2-amino-1,3,4-thiadiazole (atdz), and their crystal structures and properties have been determined. On each tetranuclear complex, two Cu or Ag atoms (M) are bridged by two atdz ligands to form a six-membered N2M2N2 framework. The two N2M2N2 frameworks are in parallel linked by another atdz ligand to provide the tetranuclear structure with a rectangular M4 core. The four Cu or Ag atoms possess a trigonal-square geometry. The two adjacent M M separations are (3.096(1) and 3.412(1) Å) and (3.316(2) and 3.658(2) Å) for 1 and 2, respectively. On both tetranuclear complexes there are two species of hydrogen bonds between the ClO4 ? anions and the NH2 group of atdz ligands. It is proposed that the hydrogen bonds are related to the stabilization of the tetranuclear structure during the crystallization process. |