catena-Poly[dibromozinc(II)-mu-ethylenediamine-N:N']: resolution of structural anomalies resulting from the interpretation of vibrational spectra.
The title structure, [ZnBr2(C2H8N2)], is made up of infinite -ZnBr2-(en)-ZnBr2-(en)- zigzag chains. Each repeat unit contains a trans ethylenediamine ligand [N-C-C-N -179 (1) degrees ], which bridges two approximately tetrahedral but crystallographically distinct Zn atoms. One Zn atom is bisected by a crystallographic twofold axis, whereas the other has mirror symmetry. Even though the crystal packing does not allow significant interaction between Zn and N atoms on adjacent chains, it does facilitate extensive intermolecular N-H...Br hydrogen bonding (N...H 2.69-2.96 A).
Pritchard
R G
RG
Department of Chemistry, UMIST, Manchester M60 1QD, England. robin.pritchard@umist.ac.uk
Eaton
N
N
McDonald
S
S
Strickland
P
P