Helical Coordination Polymers Based on A Tripodal N‐donor Ligand

Abstract

The coordination polymers [Cu2(tpim)2]·2H2O (1) and [Co(H2tpim)2(MoO4)2] (2) [Htpim = 2,4,5‐tri(4‐pyridyl)‐imidazole] were synthesized. Their structures were determined by single‐crystal X‐ray diffraction and further characterized by elemental analyses, IR spectroscopy, and TG analyses. Compounds 1 and 2 both contain chiral helical‐layer structures. Compound 1 exhibits a novel 3D (3,3,4)‐connected framework with (4·6·8)(6·82)(4·6·83·10) topology, which is constructed from left‐ and right‐ helices. Compound 2 displays a 2D chiral helical‐layer structure which can be rationalized as a (3,6)‐connected 2D kgd (kagome dual) net, and these 2D layers are further extended by hydrogen‐bonding interactions to form a 3D supramolecular network. By comparing compounds 1 and 2, it is believed that the tripodal N‐containing ligand (Htpim) plays a key role in the construction of helical coordination polymers. In addition, the photoluminescence property of compound 1 and the magnetic property of compound 2 were studied.

Construction and Properties of Ag-I Polymeric Clusters Attach with Nitrogen Heterocyclic Transition Metal Moiety

“…Nitrogen heterocyclic complexes are metal organic frameworks with speci c structures formed by using nitrogen heterocyclic organic compounds as ligands and connecting with the central metal. A simple nitrogen heterocyclic ring is an organic compound containing a ve-membered or six-membered heterocyclic structure in the molecule, which means that there is at least one nitrogen atom in the heterocyclic ring [22] . Nitrogen heterocyclic ligands can form π-π interactions between rings to further stabilize the structure of the complex [23][24][25][26][27] .…”