Crystallisation of flexible dipyridyl ligands with Cd(NO4-bis(4-pyridyl)butane]; [Cd 2 (NO 3 ) 4 (Py 2 C 5 H 10 ) 3 (H 2 O)] 5 [Py 2 C 5 H 10 = 1,5-bis(4-pyridyl)pentane] and [Cd(NO 3 ) 2 (Py 2 C 6 H 12 ) 2 ] 6 [Py 2 C 6 H 12 = 1,6-bis(4-pyridyl)hexane]. The compounds were characterised by X-ray single crystal diffraction studies. In compounds 1, 2, 4 and 6 the cadmium ions are hexa-co-ordinate with a slightly distorted octahedral geometry. Compounds 3 and 5 both display examples of a less common hepta-co-ordinate cadmium ion geometry. Compounds 2, 3 and 6 exhibit novel modes of interpenetration.
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