Synthesis and characterization of two self-catenated networks and one case of pcu topology based on the mixed ligands

Abstract

Reactions of 2,2′-(naphthalene-1,5-diylbis(oxy))diacetic acid (H₂ndd) and two types of metal salts with different auxiliary ligands: 4,4′-bipyridine (4,4′-bipy), 1,4-di(1H-imidazol-1-yl)benzene (DIMB) and 1,4-bis[(1H-imidazol-1-yl)methyl]benzene (BIMB), yield two self-catenated networks and a classic pcu network. The structures of compounds 1–3 are elucidated by single crystal X-ray diffraction. Topological analysis reveals that the compound 1 is a new (4,8)-connected self-catenated network with point symbol of (3²·4²·5²)(3²·4⁹·5¹²·6⁵)₂ based on the trinuclear zinc clusters as an eight-connected node. 2 is an eight-connected self-catenated network with ilc topology and 3 is a 6-connected pcu network. Photoluminescent properties and thermogravimetric analyses for 1–3 were also investigated in detail.