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The high‐temperature oxidation of the rare earth metals holmium and neodymium with the amine pyrazole gave the two new compounds [Ho(Pz)3(PzH)3] (1) and [Nd(Pz)3(PzH)4] (2) (pyrazole, PzH = C3H3NNH; pyrazolate anion, Pz− = C3H3NN−). 1 exhibits a one dimensional chain structure with the unusually high number of twelve nitrogen atoms that form a hexagonal antiprism as coordination polyhedra around HoIII. 2 consists of monomeric molecules containing trivalent neodymium with the coordination number of nine. The coordination polymer 1 shows both a higher thermal stability as well as a packing of a dinstinctively higher density than monomeric 2. Both compounds were investigated by low‐temperature single crystal X‐ray analysis, Mid IR, Far IR and Raman spectroscopy. Simultaneous DTA/TG and temperature dependent x‐ray powder diffraction were used as combinatory methods to investigate the thermal properties of both compounds.
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Quitmann et al. (2005) studied this question.
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