Structural and functional studies on coordination polymers based on 5-tert-butylisophthalic acid and N,N′-bis-(4-pyridylmethyl) piperazine

Abstract

By using 5-tert-butylisophthalic acid (H₂tbip) and N,N′-bis-(4-pyridylmethyl) piperazine (bpmp), three coordination polymers formulated as {[Co(bpmp)(tbip)]·H₂O}_n (1), {[Ni(bpmp)_1.5(tbip)(H₂O)]·H₂O}_n (2), and {[Cd(bpmp)_1.5(tbip)]·3H₂O}_n (3) have been synthesized under hydrothermal conditions. All complexes were characterized by single crystal X-ray diffraction analysis, powder X-ray diffraction analysis, elemental analysis, infrared spectroscopy and thermogravimetric analysis. The results show that complex 1 presents a 3D 6-connected network. Complex 2 shows a three-fold interpenetrating framework based on subunits with {4⁶.6⁴}-bnn hexagonal BN topology while complex 3 shows a 2D → 3D polycatenation framework containing 2D bilayer motifs as the fundamental building units. The photocatalytic properties of complexes 1 and 2 have been evaluated and the results show that they are active as a catalyst for the decomposition of Rhodamine B under visible light. The photoluminescence properties of complex 3 were also assessed in the solid state at room temperature.