Observation of tancoite-like chains in a one-dimensional metal-organic polymer

Abstract

A hydrothermal reaction of diphenic acid, NaOH, water and the corresponding lanthanide salt at a pH of ∼5.5 gives rise to a new one-dimensional metal-organic coordination polymer, ¹ ∝ [M₂(H₂O)₂ (C1₄H₈O₄)₃] (M = Nd, Dy or Y). The structure is built up from a network of distorted dodecahedral MO₈ units and the diphenate anions. The M atoms are connected through an oxygen atom, giving rise to tancoite-like chains, to which the diphenate anions are grafted completing the one-dimensional structure. Magnetic studies indicate only paramagnetic behavior in the temperature range 4-300 K for M = Dy. The compounds exhibit photoluminescence at room temperature with the main emission band at 450 nm (λ_ex = 338 nm).