Z. Glavcheva, H. Umezawa, S. Okada
Aug 1, 2004
Citations
0
Influential Citations
16
Citations
Journal
Materials Letters
Abstract
Abstract New pyridinium–metal iodide complexes were synthesized. The 4-substituted pyridinium iodides X–C5H4N+–CH3I−, where X=methyl, amino, cyano, methoxycarbonyl, carbamoyl, or dimethylamino group, were found to form 2:1 crystalline complexes with ZnI2, except for the carbamoyl derivative, and 1:1 complexes with PbI2. Three SHG active complexes were found from the lead complexes. Among the complexes prepared, the crystal structures of bis(4-cyano-1-methylpyridinium) tetraiodozincate (CNP/ZnI4), bis(4-dimethylamino-1-methylpyridinium) tetraiodozincate (DAP/ZnI4), and 1-methyl-4-carbamoylpyridinium triiodoplumbate (CP/PbI3) were investigated. It was found that DAP/ZnI4 and CNP/ZnI4 crystallized in centrosymmetric monoclinic C2/c space group, while the structure of CP/PbI3 was refined in noncentrosymmetric orthorhombic P212121 space group. It was also established that the inorganic parts of both DAP/ZnI4 and CNP/ZnI4 crystals were composed of [ZnI4]2− anions with tetrahedral structure, and the inorganic moieties of CP/PbI3 consisted of one-dimensional face-sharing lead iodide octahedra. CP/PbI3 was assessed to have approximately one-fourth of the nonlinear optical coefficient (d) of 3-methyl-4-nitropyridine-1-oxide (POM).