New quasi-one-dimensional tetracyanidoplatinate, Cs4[Pt(CN)4](CF3SO3)2: Synthesis, structure, and physical characterization
The synthesis and some physical properties of a new quasi-one-dimensional tetracyanidoplatinate, Cs4[Pt(CN)4](CF3SO3)2 (CsCP(OTf)) are reported and described in comparison to the well-known K2[Pt(CN)4]Br0.30·3.2H2O (KCP). Single-crystal X-ray diffraction reveals Pt–Pt spacings to be greater than those of KCP by 5% longitudinal and 38% transverse, but much shorter than comparable spacings in other non-partially oxidized platinates. Anomalies are observed between temperatures 100 K and 200 K: (1) Longitudinal DC conductivity is two orders of magnitude higher and is non-monotonic with temperature, showing a minimum at around 170 K. (2) Nuclear magnetic resonance (NMR) longitudinal relaxation time T1 is at least three orders of magnitude higher than that of KCP, and is also non-monotonic with temperature, showing a sharp peak at around 120 K. Since X-ray diffraction reveals no structural transition at 120 K, these suggest a possible lattice freezing or stiffening at around 120 K.
Author Supplied Keywords
Quasi-one-dimensional conductors, DC conductivity, Nuclear magnetic resonance
Citation: Pilot Scholars Version (Modified MLA Style)
Gapud, A. A.; Weber, A. P.; Alexander, J. A.; Pham, L.; Khan, A.; Leatherbury, R. I.; Reyes, A. P.; Lumata, L. L.; Kuhns, P. L.; Valente, Edward J.; and Sykora, R. E., "New quasi-one-dimensional tetracyanidoplatinate, Cs4[Pt(CN)4](CF3SO3)2: Synthesis, structure, and physical characterization" (2014). Chemistry Faculty Publications and Presentations. 27.
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