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Abstract Three new coordination polymers (CPs), Cu (NDC) (Fbtx) (H 2 O) ⋅ 1. 5H 2 O n (1), Co (NDC) (Fbtx) (H 2 O) 2 ⋅ 0. 5Fbtx n (2), and Co 2 (NDC) 2 (Fbtx) n (3), were synthesized by employing acid‐base mixed ligands of rigid 1, 4‐naphthalenedicarboxylic acid (H 2 NDC) and flexible bis (1, 2, 4‐triazole‐1‐ylmethyl) ‐2, 3, 5, 6‐tetrafluorobenzene (Fbtx) under both hydrothermal and microwave‐assisted reaction conditions. Single‐crystal structure analysis establishted that both compounds 1 and 2 exhibit two‐dimensional (2D) layered structures, while compound 3 features a three‐dimensional (3D) complicated framework. The geometries of metal ions vary from square pyramidal (in 1 and 3) to distorted octahedral (in 2). Topological strudy showed that compounds 1 and 2 have exposed common 4‐connected 4 4 ‐ sql net, while compound 3 has made a novel 4, 5‐connected net with point symbol of (4 3 ⋅ 6 2 ⋅ 7) (4 3 ⋅ 6 4 ⋅ 7 2 ⋅ 8). The catalytic performance of the three complexes for the solvent‐free ring‐opening polymerization of L ‐lactide has been investigated. The results indicated that compound 3 with coordinatively unsaturated cobalt (II) sites showed good activity and the molecular weight of the polymer obtained was high. Moreover, the complex 3 catalyst could be recycled up to five times with the retention of both catalytic activity and crystal structure.
Tao et al. (Wed,) studied this question.