Vibrational studies of one-dimensional conductors: K2Pt(CN)4Br0.3⋅3H2O and K2Pt(CN)4Cl0.3⋅3H2O

Abstract
Raman and infrared spectra of K2Pt(CN)4⋅Br0.3⋅3H2O, KCP (Br); K2Pt(CN)4⋅Cl0.3⋅3H2O, KCP(Cl), and K2Pt(CN)4⋅3H2O were obtained at ambient and nonambient conditions of temperature and pressure. The systems KCP(Br) and KCP(Cl) represent very interesting and unusual materials for ir–Raman spectroscopic studies because while neutron and x‐ray diffraction measurements confirm the assignment of a noncentrosymmetric space group, the observable effects of the unit cell asymmetry are so slight, with respect to the vibrations of the Pt(CN)2−4 moiety, that the group may be considered as being present in a symmetric D2h environment (vide infra).