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Phase Transition and Crystal Structure of the Monomeric Europium(II) Thiolate Eu(SC 36 H 49 ) 2
Author(s) -
Angelkort Joachim,
van Smaalen Sander,
Hauber Sven Oliver,
Niemeyer Mark
Publication year - 2007
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.200600398
Subject(s) - europium , crystallography , valence (chemistry) , phase transition , chemistry , crystal structure , diffraction , phase (matter) , bond length , crystal (programming language) , monomer , isopropyl , materials science , condensed matter physics , polymer , physics , ion , optics , organic chemistry , programming language , computer science
Single crystal X‐ray diffraction of Eu(SC 36 H 49 ) 2 has revealed a first order phase transition at a temperature of 119 K, that involves a reduction of the specific volume by 1 %. The transition corresponds to a doubling of the unit cell, as it is the result from reorientations of isopropyl groups that appear at peripheral sites of the organic ligands. It is argued that a denser packing is achieved at the expense of a less favourable conformation of one of the two crystallographically‐independent complexes in the low‐temperature phase. The Bond‐Valence method is used to show that interactions of equal strengths are present between europium and both sulphur atoms and both coordinating phenyl rings.