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The Coordination Polymer Cr(en) 2 As 2 VO 7 Consisting of Alternating VO 4 Tetrahedra and As 2 O 5 Handles Decorated by Cr 3+ Centered Complexes
Author(s) -
Rasmussen Maren,
Näther Christian,
Bensch Wolfgang
Publication year - 2021
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.202100035
Subject(s) - crystallography , octahedron , hydrogen bond , moiety , tetrahedron , ethylenediamine , coordination polymer , crystal structure , ring (chemistry) , chemistry , infrared spectroscopy , materials science , stereochemistry , molecule , inorganic chemistry , organic chemistry
The new coordination polymer Cr(en) 2 As 2 VO 7 (en=ethylenediamine) was synthesized under solvothermal conditions as deep red crystals. In the crystal structure VO 4 tetrahedra and As 2 O 5 handles formed by corner‐sharing of two AsO 3 pyramidal units are joined by common oxygen atoms into an undulated chain that is directed along the crystallographic b‐axis. The chain is decorated by [Cr(en) 2 ] 3+ complexes with the Cr 3+ cation having bonds to two terminal O 2− anions of the As 2 O 5 moiety thus generating a CrN 4 O 2 octahedron, which displays a cis‐configuration. The connection mode between Cr 3+ and As 2 O 5 leads to formation of a six‐membered CrAs 2 O 3 ring. The chains are arranged in a layer‐like fashion in the (001) plane and these layers are stacked along [001]. A large number of N−H⋅⋅⋅O and C−H⋅⋅⋅O hydrogen bonds generate a three dimensional network. A Hirshfeld surface analysis was performed for visualizing the extended interchain interactions. The hydrogen bonding interactions are clearly detected in the IR spectrum. The UV‐Vis spectrum shows an absorption at 2.3 eV which is in agreement with the red color of the sample.