Journal
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
Volume -, Issue 8, Pages 1176-1179Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b009771n
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The reaction of zinc(II) bromide with pyrazine yielded the two coordination polymers [ZnBr2(pyz)] 1 and [ZnBr2(pyz)(2)] 2. Crystal structures of these two compounds show that 1 is a 1-D zigzag chain polymer while 2 forms a regular square-grid (4,4) network. Adjacent grids in 2 are slipped in one direction so that the axial bromide ions on one layer project into the cavities of the grids in adjacent layers. The solid-state reaction of 1 with pyrazine yields 2, and 2 in its turn is readily converted into 1 by heating. The activation energy of the latter process has been determined as 99.8 kJ mol(-1).
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