New quasi-one-dimensional tetracyanidoplatinate,Cs4[Pt(CN)4](CF3SO3)2: Synthesis,structure, and physical characterization |
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| Authors: | AA Gapud AP Weber JA Alexander L Pham A Khan RI Leatherbury AP Reyes LL Lumata PL Kuhns EJ Valente RE Sykora |
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| Institution: | 1. Department of Physics, University of South Alabama, 411 N. University Blvd., Mobile, AL 36688, USA;2. Department of Chemistry, University of South Alabama, 411 N. University Blvd., Mobile, AL 36688, USA;3. Department of Electrical and Computer Engineering, University of South Alabama, 411 N. University Blvd., Mobile, AL 36688, USA;4. National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 32310, USA;5. Chemistry Department, University of Portland, 5000 N. Willamette Blvd., Portland, OR 97203, USA |
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| Abstract: | The synthesis and some physical properties of a new quasi-one-dimensional tetracyanidoplatinate, Cs4Pt(CN)4](CF3SO3)2 (CsCP(OTf)) are reported and described in comparison to the well-known K2Pt(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. |
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| Keywords: | Quasi-one-dimensional conductors DC conductivity Nuclear magnetic resonance |
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