Synthesis and Characterization of Two New Mn(II) Coordination Polymers Containing Different Metal-Carboxylate Chain Motifs

Abstract

Two Mn(II) coordination polymers, formulated as [Mn(Hhtpa)₂(bpa)₂(H₂O)]_n (1) and {[Mn(htpa)(H₂O)]·H₂O}_n (2) (htpa = 4-carboxyphenylacetate, bpa = 1,2-di(4-pyridyl)-ethane), have been synthesized by the hydrothermal reaction and characterized by single-crystal X-ray diffraction, elemental analysis, IR, and thermo-gravimetric analyses (TGA). The structures of both compounds are based on different Mn(II)-carboxylate chain motifs. Complex 1 is a one-dimensional coordination polymer featuring μ₂-carboxyl bridged MnO₄N₂ octahedra. Complex 2 contains Mn-O inorganic chains, featuring μ₂-O bridged MnO₆ octahedra, which are interconnected further by interchain htpa ligands to form a two-dimensional coordination polymer.

Keywords::

• 4-carboxyphenylacetic acid
• coordination polymers
• crystal structure
• manganese