Magneto-structural analysis of metal-orotato coordination complexes based on NH⋯O and OH⋯O supramolecular synthon

Two new supramolecular synthon induced single crystals of metal-orotato complexes of formula [Cu(Orotate)·2H2O]2 (1), [Mn(Orotate)2·2H2O]·2H2O] (2), have been engineered and synthesized by self-assembly of metal salts with orotic acid in presence of 25% ammonia solution. Although both complexes crystallize in similar crystal system and different coordination geometries [(square planar (1), octahedral (2)] but identical synthon patterns recur after complex formation. NH⋯O, OH⋯O synthons were the only artifact for both the hydrogen bonded metal–organic architecture. X-ray structural analysis, EPR, temperature independent paramagnetism (TIP) analysis, have been discussed. DFT calculation is used to rationalize the magnetic behavior of both the complexes. These calculations underline the pathway of magnetic exchange interactions through NH⋯O, OH⋯O supramolecular synthons and confirm, that the magnetic interactions propagate through such contacts in complex 1 and 2.

Graphical abstractThe DFT calculations underline the pathway of magnetic exchange interactions through NH⋯O, OH⋯O supramolecular synthons and confirm that the magnetic interactions propagate through such contacts in reported metal-orotato complexes.Figure optionsDownload full-size imageDownload as PowerPoint slide