March 3, 20260 citationsOpen Access

Hydro-thermal synthesis and crystal structure of polybis-(μ3-3,4-di-amino-benzoato)manganese, a layered coordination polymer.

MKMuhammad Kaleem Khosa PWPaul T Wood SHSimon M Humphrey

Key Points

The crystal structure comprises a two-dimensional coordination polymer formed by manganese ions and the μ3-N,O,O' ligand, creating infinite layers.
Intra-layer N-H⋯O and inter-layer N-H⋯N hydrogen bonds stabilize the structure, contributing to its layered formation.
The synthesis is achieved via hydro-thermal methods, ensuring precise control over the coordination of manganese ions in the polymer.
Comparative analysis with similar complexes highlights the unique characteristics of the C7H7N2O2 anion's role in coordination.

Abstract

The hydro-thermal synthesis and crystal structure of the title two-dimensional coordination polymer, polybis-(μ3-3,4-di-amino-benzoato-κ3 N 3,O,O')manganese(II), Mn(C7H7N2O2)2 n , are described. The Mn2+ cation (site symmetry ) adopts a tetra-gonally elongated trans-MnN2O4 octa-hedral coordination geometry and the μ3-N,O,O' ligand (bonding from both carboxyl-ate O atoms and the meta-N atom) links the metal ions into infinite (10) layers. The packing is consolidated by intra-layer N-H⋯O and inter-layer N-H⋯N hydrogen bonds. The structure of the title compound is compared with other complexes containing the C7H7N2O2 - anion and those of the related M(C8H8NO2)2 (M = Mn, Co, Ni, Zn) family, where C8H8NO2 - is the 3-amino-4-methyl-benzoate anion.

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