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Crystal structure and thermal behavior of a chromium-piperazinium phosphate

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Abstract

(C4N2H12)CrO(H1.5PO4)2·H2O has been synthesized hydrothermally using piperazine as organic template. Its crystal structure was solved ab initio using synchrotron powder X-ray diffraction data [monoclinic, a = 16.9649(4) Å, b = 9.8609(2) Å, c = 7.14375(14) Å, and β = 94.896(3)°, space group P21/a, Z = 4]. 1D structure is composed by isolated infinite anionic chains [CrO(H1.5PO4)2]n (vertex-sharing {CrO6} octahedra joined by phosphate moieties). Their 2D plate-like morphology is propitiated by a very strong inter-chain interaction (P–O···H···O–P symmetric hydrogen bonds). KAS isoconversional method was applied to determine the activation energy for both thermal and thermo-oxidative decomposition of (C4N2H12)CrO(H1.5PO4)2·H2O.

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Acknowledgements

We thank financial support from Spanish MINECO (PI201060E013, MAT2010-15094, Factoría de Cristalización—Consolider Ingenio 2010 and Técnicos de Infraestructuras Científico-Tecnológicas grant PTA2011-4903-I to Z.A. and PTA2011-4950-I to S.A.K.) and FEDER.

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Author notes

  1. Iván da Silva

    Present address: ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxfordshire, OX11 0QX, UK

Authors and Affiliations

  1. SpLine, Spanish CRG Beamline at the ESRF, European Synchrotron Radiation Facility, BP 220, 38043, Grenoble, France

    Iván da Silva & Germán R. Castro

  2. Instituto de Ciencia de Materiales de Madrid-ICMM/CSIC, Cantoblanco, 28049, Madrid, Spain

    Iván da Silva & Germán R. Castro

  3. Departamentos de Química Física y Analítica y Química Orgánica e Inorgánica, Universidad de Oviedo – CINN, 33006, Oviedo, Spain

    Zakariae Amghouz, Aránzazu Espina, Sergei A. Khainakov, Santiago García-Granda & José R. García

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  1. Iván da Silva
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  4. Aránzazu Espina
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Corresponding author

Correspondence to José R. García.

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da Silva, I., Castro, G.R., Amghouz, Z. et al. Crystal structure and thermal behavior of a chromium-piperazinium phosphate. J Therm Anal Calorim 117, 1179–1186 (2014). https://doi.org/10.1007/s10973-014-3894-0

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  • DOI: https://doi.org/10.1007/s10973-014-3894-0

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