ISSN:
1572-8854
Keywords:
Copper(II) halide
;
mxied valence
;
twinned crystal
;
chain structure
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract The essentially anaerobic reaction of CuBr2 and 14ane-N4 in water/acetone solvent (14ane-N4 = 1,4,8,11-tetraazacyclotetradecane) yields a mixed valence Cu(I)/Cu(II) compound. The compound is orthorhombic, space group Pcnn, with a = 23.6310(1) Å, b = 23.6429(2) Å, c = 12.4537(1) Å and V = 6957.95(9) Å3 with Z = 16, for ρcalc = 2.349 g/cc. Refinement of a twinned crystal with 8,504 unique reflections yielded final values of R1 = 0.0725 (|F| 〉 2σ) and w R2 = 0.114 and a goodness of fit of 1.448. The compound contains chains of Cu(14ane-N4)2+ cations and CuBr3 2− anions, which are linked together by long semicoordinate Cu(II)···Br bonds. The chains run perpendicular to the c axis and are arranged in layers in which the chains alternately run parallel to the (1 1 0) and to the (1 −1 0) crystal directions. The Cu(II) ion is coordinated by the tetradentate macrocycle to yield an approximate square planar coordination. The CuBr3 2− anions have a nearly trigonal planar with Cu–;Br(ave) = 2.38(1) Å.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1009581922377
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