Two second-order non-linear optical coordination polymers with noninterpenetrating honeycomb-like 2-D (6,3)-type networks

Two isostructural metal-organic frameworks, [ML(H2O)(4)](n) (M = Y(II) (1) and Nd(II) (2)), NaH2L = 5-sulfoisophthalic monosodium salt), have been synthesized by hydrothermal reactions. Each metal is nine-coordinate with a distorted tricapped trigonal prismatic arrangement. L3- is a mu(3) bridge to generate a homometallic 2-D noninterpenetrating (6,3) honeycomb-like topological network structure. The luminescence spectra indicate emission maxima at 406 and 402 nm, respectively. Compounds 1 and 2 show second-harmonic generation responses that are 0.5 and 0.8 times that of urea, respectively. [GRAHICS].