Crystal structure of ammonium/potassium trans-bis­(N-methyl­iminodi­acetato-κ3O,N,O′)chromate(III) from synchrotron data

Acta Crystallographica Section E: Crystallographic Communications

Choi, J.-H.¹  Moon, D.² 

[1] Department of Chemistry, Andong National University, Andong 36729, Republic of Korea;Pohang Accelerator Laboratory, POSTECH, Pohang 37673, Republic of Korea

关键词: CRYSTAL STRUCTURE;    SYNCHROTRON RADIATION;    AMMONIUM/POTASSIUM SALT;    BIS(METHYLIMINODIACETATO)CHROMATE(III) ION;    MIDA;    TRANS-FACIAL CONFIGURATION;    HYDROGEN BONDING;   

DOI  :  10.1107/S2056989016011804

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

The structure of the title compound, [(NH4)0.8K0.2][Cr(C5H7NO4)2] (C5H7NO4 is methyl­iminodi­acetate; mida), has been determined from synchrotron data. The CrIII atom is located on a centre of symmetry and is coordinated by two N atoms and four O atoms of two facially arranged tridentate mida ligands, displaying a slightly distorted octa­hedral coordination environment. The Cr—N and mean Cr—O bond lengths are 2.0792 (14) and 1.958 (14) Å, respectively. The cation site is located on a twofold rotation axis and shows occupational disorder, being occupied by ammonium and potassium cations in a 0.8:0.2 ratio. In the crystal, inter­molecular hydrogen bonds involving the N—H groups of the ammonium cation as donor and the two non-coordinating O atoms of the carboxyl­ate group as acceptor groups consolidate the three-dimensional packing.

【 授权许可】

CC BY