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Powder diffraction studies of 1,2- and 1,3-diaminopropane octamolybdates

Maciej P. Grzywa 1Wieslaw Lasocha 1,2

1. Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences (ICSC), Niezapominajek 8, Kraków 30239, Poland
2. Jagiellonian University, Faculty of Chemistry, Ingardena 3, Kraków 30-060, Poland

Abstract

Molybdates are very important compounds which are used in a wide range of applications such as lubricants, catalyst and corrosion inhibitors. In this work, synthesis and results of powder diffraction studies of 1,2- and 1,3-diaminopropane octamolybdates are presented.

The compounds have been obtained by reaction of molybdic acid with 1,2-diaminopropane and 1,3-diaminopropane in acidic solution (acetic acid, formic acid), respectively. Crystal structures have been determined by X-ray powder diffraction method.

The lattice parameters and space groups were determined using PROSZKI package [1]. The crystal structure models were obtained by global optimization methods (FOX program [2]) and by direct methods (EXPO program [3]). Final refinements by the Rietveld method were performed using Jana2000 [4] and GSAS [5-6] programs.

Investigated octamolybdates crystallize in the monoclinic space groups: P21/n and P21/c with: a=11.524(2), b=17.415(3), c=7.900(2) Å, β=109.87(2)°, V=1491.0(4) Å3 (1,2-diaminopropane) and a=12.696(2), b=15.176(2), c=7.838(2) Å, β=96.89(2)°, V=1499.2(4) Å3 (1,3-diaminopropane). Both compounds were also investigated using TG/DSC, IR and XRPD thermal decomposition studies.

Fig.1. Structure scheme for [Mo8O26]4- anion.


[1] W. Łasocha, K. Lewinski, PROSZKI–a system of programs for powder diffraction data analysis, J. Appl. Crystall., 27, 1994, 437-438
[2] V. Favre–Nicolin, R. Cerny, J. Appl. Cryst., 2002, 35, 734–743
[3] A. Altomare, M. C. Burla, M. Camalli, B. Carrozzini, G. L. Cascarano, C. Giacovazzo, A. Guagliardi, G. Moliterni, G. Polidori, R. Rizzi, J. Appl. Cryst., 1999, 32, 339–340
[4] V. Petricek, M. Dusek, L. Palatinus, Jana2000. The crystallographic computing system. Institute of Physics, Praha, Czech Republic, 2000
[5] A. C Larson, R. B. Von Dreele, GSAS, Los Alamos National Laboratory Report LAUR 86-748, 2000
[6] B. H. Toby, EXPGUI, J. Appl. Cryst. 34, 2001, 210-213

The support of the Polish MEiN; grant 1T09A 07730 is gratefully acknowledged.

 

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Presentation: Poster at 11th European Powder Diffraction Conference, Poster session, by Maciej P. Grzywa
See On-line Journal of 11th European Powder Diffraction Conference

Submitted: 2008-04-30 15:33
Revised:   2009-06-07 00:48