Trinuclear Mn/Zn based microporous coordination polymers as efficient catalysts for ipso-hydroxylation of boronic acids.

Two microporous coordination polymers based on hourglass trinuclear building units, [Mn(bpdc)(bpy)]·2DMF and [Zn(bpdc)(bpy)]·2DMF·4HO (bpdc = 4,4'-biphenyl dicarboxylic acid, bpy = 4,4'-bipyridine), have been synthesized under solvothermal conditions employing DMF as the solvent. Each structure consists of two crystallographically distinct M (M1 and M2) centers that are connected via carboxylate bridges from six bpdc ligands, generating a trinuclear metal cluster, [M(bpdc)(bpy)]. Cluster representation of the structure resulted in an interpenetrated net of rare hex topological type.

Redetermined structure of 4,4'-bi-pyridine-1,4-phenyl-enedi-acetic acid (1/1) co-crystal.

The asymmetric unit of the title 1:1 co-crystal, C10H8N2·C10H10O4, consists of one half-mol-ecule each of 4,4'-bi-pyridine and 1,4-phenyl-enedi-acetic acid: the complete mol-ecules are generated by crystallographic inversion centres. The dihedral angle between the -CO2H group and the benzene ring in the diacid is 73.02 (7)°.