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A Novel Chromium 18‐Azametallacrown‐6 Complex with Antiferromagnetic Interactions
Author(s) -
Chen GongJun,
Gao ChunYan,
Gu Wen,
Liu Xin,
Yan ShiPing,
Tian JinLei,
Liao DaiZheng
Publication year - 2011
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.201000305
Subject(s) - chromium , deprotonation , hexacoordinate , antiferromagnetism , chemistry , crystallography , ring (chemistry) , ligand (biochemistry) , chromium compounds , metal , ion , intramolecular force , stereochemistry , physics , organic chemistry , biochemistry , receptor , silicon , condensed matter physics
Abstract A new nanometer‐sized hexanuclear chromium azametallacrown complex, [Cr 6 (ashz) 6 (H 2 O) 6 ] · 11H 2 O ( 1 ), was isolated from the reaction of Cr(ClO 4 ) 3 · 6H 2 O and N ‐acetylsalicylhydrazide (H 3 ashz). Six triply‐deprotonated ligands (ashz 3– ) link six chromium ions by hydrazide N–N groups, thus generating a hexanuclear chromium aggregate with a 18‐membered ring system. The binding mode of the ligand enforces that the six ring metal ions are not located in a plane, but with a chair conformation. Interestingly, the resulting chiralities of the hexacoordinate chromium atoms alternate between Λ and Δ forms. Magnetic susceptibility data of the complex indicate intramolecular antiferromagnetic coupling of the Cr III atoms.