A series of coordination polymers assembled from d10 metals and a new multidentate N-donor ligand: syntheses, structures, and photoluminescent properties

Abstract

Seven new coordination polymers based on d¹⁰ metals and multidentate N-donor ligands, namely [Na_0.4Cd₄(htpmb)(L¹)_3.2(Cl)₂(H₂O)_2.4]·0.8H₂L¹·1.6H₂O (1), [Cd₄(htpmb)(L¹)₃(OH)₂(H₂O)₂]·3H₂O (2), [Zn₂(htpmb)(L¹)₂]·H₂L¹·H₂O (3), [Zn₂(htpmb)(L¹)₂]·3H₂O (4), [Zn₂(htpmb)(HL²)₄] (5), [Zn₂(htpmb)(L³)₄] (6), and [Cd₄(htpmb)(L⁴)₂(OH)₂(H₂O)₃]·8H₂O (7), where htpmb = hexakis(3-(1,3,4-triazol-1-yl)phenoxy-methyl)benzene, H₂L¹ = 1,4-benzenedicarboxylic acid, H₂L² = 2-hydroxy-benzoic acid, HL³ = benzoic acid and H₃L⁴ = 5-hydroxy-1,3-benzenedicarboxylic acid, have been synthesized under hydrothermal conditions. Compounds 1 and 2 display the same 3D framework with new binodal 6-connected (4⁵·5⁵·6⁵)(4⁶·6⁹) topology based on dinuclear Cd(II) units. Compounds 3 and 4 show identical 3D 2-fold interpenetrating frameworks with rare binodal 4-connected (4·6⁴·8)(4²·6²·8²) topology. Compounds 5 and 6 reveal a similar 1D chain structure. Compound 7 exhibits a 1D double chain structure. The complexes were structurally characterized by single-crystal X-ray diffraction analyses, elemental analyses, powder X-ray diffraction (PXRD), ultraviolet-visible absorption spectra (UV-vis), and infrared spectra (IR). The influences of coordination modes of the htpmb, and pH values on the structures of the coordination polymers have been discussed. The effects of central metals, carboxylate anions, and N-donor ligand on the final topologies have been discussed. The luminescent properties of the seven compounds have also been investigated in detail.