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The Unsubstituted Rare Earth Pyrazolates [Nd(Pz) 3 (PzH) 4 ] and ∞ 1 [Ho(Pz) 3 (PzH) 3 ]: Structural Diversity from Monomers to a Coordination Polymer
Author(s) -
Quitmann Catharina C.,
MüllerBuschbaum Klaus
Publication year - 2005
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200400509
Subject(s) - crystallography , pyrazole , coordination number , monomer , chemistry , coordination polymer , neodymium , lanthanide , raman spectroscopy , infrared spectroscopy , denticity , molecule , powder diffraction , coordination complex , crystal structure , polymer , ion , stereochemistry , metal , organic chemistry , laser , physics , optics
The high‐temperature oxidation of the rare earth metals holmium and neodymium with the amine pyrazole gave the two new compounds ∞ 1 [Ho(Pz) 3 (PzH) 3 ] ( 1 ) and [Nd(Pz) 3 (PzH) 4 ] ( 2 ) (pyrazole, PzH = C 3 H 3 NNH; pyrazolate anion, Pz − = C 3 H 3 NN − ). 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 Ho III . 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.