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DTA-TGA, crystal and molecular structure determination and vibrational studies of potassium nitroprusside sesquiquarterhydrate, K2[Fe(CN)5NO]·1.25H2O

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Abstract

The crystal structure of the title compound has been determined from diffractometer data and refined with isotropic thermal parameters to finalR w factors ofR=0.058 andR w =0.056. It crystallizes in the orthorhombic space groupp212121 (No. 19), witha=9.706(7),b=18.826(6), andc=25.258(6) Å. The asymmetric unit contains four nitroprusside ions, eight potassium ions, and five water molecules, one of which shows disorder. The infrared spectra of the polycrystalline compound, both normal and with different degrees of deuteration at temperatures ranging from liquid nitrogen to room temperature, were obtained. The vibrational spectra present an unusual number of fundamental and first overtone NO stretching bands and a rich structure in the water bending region, in accordance with the existence of inequivalent nitroprusside ions and water molecules.

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Authors and Affiliations

  1. Programa QUINOR, Departamento de Química Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 esquina 115, C.C.962, 1900, La Plata, República Argentina

    J. I. Amalvy (Member of the “Carrera del Investigador Científico” CICPBA (Comisión de Investigaciones Científicas de la Provincia de Buenos Aires), República Argentina), E. L. Varetti (Members of the “Carrera del Investigador Científico” CONICET) & P. J. Aymonino (Members of the “Carrera del Investigador Científico” CONICET)

  2. Instituto de Física e Química de Sao Paulo, Universidade de Sao Paulo, Caixa Postal 369, 13.560, Sao Carlos, S.P., Brasil

    E. E. Castellano

  3. Departamento de Física, Facultad de Ciencias Exactas, Universidad National de La Plata, 49 esquina 115, C.C.67, 1900, La Plata, República Argentina

    O. E. Piro (Members of the “Carrera del Investigador Científico” CONICET) & G. Punte (Members of the “Carrera del Investigador Científico” CONICET)

Authors
  1. J. I. Amalvy
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  2. E. L. Varetti
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  3. P. J. Aymonino
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  4. E. E. Castellano
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  5. O. E. Piro
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  6. G. Punte
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Additional information

This work is part of a doctoral dissertation, performed while a fellow of CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), República Argentina.

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Amalvy, J.I., Varetti, E.L., Aymonino, P.J. et al. DTA-TGA, crystal and molecular structure determination and vibrational studies of potassium nitroprusside sesquiquarterhydrate, K2[Fe(CN)5NO]·1.25H2O. Journal of Crystallographic and Spectroscopic Research 16, 537–555 (1986). https://doi.org/10.1007/BF01161042

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  • DOI: https://doi.org/10.1007/BF01161042

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