Highly Stable Five-Coordinated Mn(II) Polymer [Mn(Hbidc)]_n (Hbidc=1H-Benzimidazole-5,6-dicarboxylate): Crystal Structure, Antiferromegnetic Property, and Strong Long-Lived Luminescence

A novel five-coordinated Mn(II) polymer 1H-benzimidazole-5,6-dicarboxylato manganese (II) ([Mn(Hbidc)]_n, 1) possessing abundant hydrogen bonds and π−π stacking interactions, synthesized by the hydrothermal reaction between MnSO₄ and a multifunctional organic aromatic ligand H₃bidc, displays antiferromagnetic character, strong long-lived red luminescence (λ_max = 726 nm and τ = 0.3 ms) as well as high thermal stability (up to ca. 500 °C).