New polymeric manganese azide derivatives with quinazoline

Two new polymeric derivatives of the (azido)Mn-II system with formula [Mn(H2O)(mu-N-3)(N-3)(quinaz)(2)](n) (1) and [Mn(mu-N-3)(2)](n) (2) (quinaz) (2) (quinaz = quinazoline) have been structurally and magnetically characterised. Compound I crystallises in the triclinic system, space group P1, and consists of 1D chains with single end-to-end azido bridges. These chains give a two-dimensional supramolecular arrangement by means of H-bond interactions. Compound 2 crystallises in the monoclinic system, space group C2/c, and contains a square alternating 2D network bridged by azido ligands in the end-to-end coordination mode. Compound 2 exhibits some unusual features, such as the unprecedented linear coordination of the azido bridge. Magnetic analysis reveals moderate antiferromagnetic coupling, with J values in good agreement with the expected range, as a function of the Mn-N-N bond angles. (c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005.