One-dimensional magnetism and crystal structure of catena-di-bromobis(3,5-dimethylpyridine)copper(II)
article
Crystals of catena-di-μ-bromobis(3,5-dimethylpyridine)copper(II) are monoclinic, space group P21/a. The unit cell constants are a=13.900(2), b=14.416(2), c=4.097(1) Å, β=93.49(2)°, V=819.4 Å3 and Z=2. The structure was determined from powder data using a Guinier-Johansson focussing powder camera. The structure was solved using a simplex method for function minimization to a conventional R-value of 0.13. The structure consists of infinite linear chains parallel to c in which the copper coordination is distorted elongated octahedral. Cu-Br distances were found to be 2.449(7) and 3.286(7) Å, whereas the Cu-N bond length is 2.02(2) Å. All distances are in the range usually observed for this type of compounds. The antiferromagnetic superexchange interactions between adjacent CuII ions (J = -21 cm-1) has been compared with those observed in structural similar CuBr2L2 compounds. The differences in observed J-values are discussed briefly, in relation to the structural variations. It appears that very small changes in structural parameters strongly affect the magnetic exchange. ?? 1979 Verlag Chemie, GmbH.
Topics
TNO Identifier
228678
ISSN
03404285
Source
Transition Metal Chemistry, 4(5), pp. 305-307.
Publisher
Kluwer Academic Publishers
Pages
305-307
Files
To receive the publication files, please send an e-mail request to TNO Repository.