Acta Crystallographica, Section C: Crystal Structure Communications p. m5-m8 (2011)
Update date:2022-08-03
Topics:
Boehle, Tony
Eissmann, Frank
Weber, Edwin
Mertens, Florian O. R. L.
The title compounds, [Mn(C10H8O6)] n and [Zn(C10H8O6)]n, are isomorphous coordination polymers prepared from 2,5-dimeth-oxy-terephthalic acid (H2dmt) and the respective metal(II) salts. Both complexes form three-dimensional metal-organic frameworks with each M II centre bridged by four 2,5-dimeth-oxy-terephthalate (dmt2-) anions, resulting in the same type of network topology. The asymmetric unit consists of one M II cation on a twofold axis and one half of a dmt2- anion (located on a centre of inversion). In the crystal structure, the M II centres are coordinated in a rather unusual way, as there is a distorted tetra-hedral inner coordination sphere formed by four carboxyl-ate O atoms of four different dmt2- anions, and an additional outer coordination sphere formed by two meth-oxy and two carboxyl-ate O atoms, with each of the O atoms belonging to one of the four different dmt2- anions forming the inner coordination sphere. Consideration of both coordination spheres results in a super-dodeca-hedral coordination geometry for the M II centres. Besides the numerous M II...O inter-actions, both structures are further stabilized by weak C - H...O contacts.
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