Silver

Synthesis, crystal structure and spectral studies of silver(I) cyclohexyldiphenylphosphine complexes: towards the biological evaluation on malignant and non-malignant cells

“…The geometry of these complexes depends on the metal-to-ligand ratios, the counter ion present, and the solvent being used [41][42][43][44][45]. Tertiary phosphine complexes of silver(I) of the type [AgXLn], where L = tertiary phosphine, n = 1-4, and X = coordinating or non-coordinating anion, were first prepared as early as 1937, and several publications have resulted on this topic [46][47][48][49][50]. The reaction of silver(I) salts with monodentate tertiary phosphines in a 1:2 stoichiometric ratio generally results in the formation of either monomeric [AgX(PR3)2]/[Ag(PR3)2]X [51][52][53][54][55][56][57][58][59][60][61] or dimeric complexes [AgX(PR3)2]2 [61][62][63] depending on the donor properties of the phosphine ligand, the bulkiness of the ligand, and the donor properties of the anion.…”

“…The metal centers in the majority of the neutral [AgX(PR3)2] and [AgX(PR3)2]2 complexes are predominantly four coordinate, with the anion acting as either a bidentate chelating ligand or as a bridging ligand. Two or three coordination have been found only when the anion is a weak donor or the substituents on the phosphine ligand are bulky [48,55,[58][59][60][61].…”