Thermal properties of the hybrid compound [Cu(en).sub.2./sub.(VO.sub.3./sub.).sub.2./sub.]·3H.sub.2./sub.O-phase analysis upon heating and cooling. Crystal structure characterization of its two polymorphic modifications

0543051 - FZÚ 2022 RIV NL eng J - Journal Article
Stehlíková, G. - Gyepes, R. - Bystrický, R. - Škrátek, M. - Vaněk, Přemysl - Tatiersky, J.
Thermal properties of the hybrid compound [Cu(en)₂(VO₃)₂]·3H₂O-phase analysis upon heating and cooling. Crystal structure characterization of its two polymorphic modifications.
Journal of Molecular Structure. Roč. 1230, Apr (2021), č. článku 129930. ISSN 0022-2860. E-ISSN 1872-8014
Institutional support: RVO:68378271
Keywords : copper vanadate * ethylenediamine ligand * modulation * phase transition * magnetic measurement
OECD category: Inorganic and nuclear chemistry
Impact factor: 3.841, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.molstruc.2021.129930

The inorganic-organic hybrid compound [Cu(en)2(VO3)2]•3H2O (1) was prepared by crystallization at room temperature from the CuSO4•5H2O – KVO3 – ethylenediamine – H2O system. Upon cooling 1, phase transition occurred at 176 K. Single-crystal diffraction analysis of the high- temperature and low- temperature phases has shown both phases to be polymeric, incorporating metavanadate chains (VO3)n n- –coordinated via oxygen atoms to copper(II) atoms. The four remaining positions of the copper atoms with octahedral environment are taken by nitrogen atoms of two ethylenediamine ligands. The low-temperature phase exhibits displacive modulation in its structure. The band gap of the high-temperature phase is 2.95 eV. The compound is paramagnetic (1.79 μB) and exhibits no distinct magnetic interactions.
Permanent Link: http://hdl.handle.net/11104/0320357