New coordination polymers with extended arm cyclotriguaiacyclene ligands: 1D chains, and interpenetrating or polycatenating 2D (42.62)(4.62)2 networks

Abstract

A series of new 1D chain and 2D coordination polymers with cyclotriguaiacylene-type ligands are reported. A zig-zag 1D coordination chain is found in complex [Cd₂(4ph4py)(NO₃)₃(H₂O)₂(DMA)₂]·(NO₃)·(DMA)₄, where 4ph4py = tris[4-(4-pyridyl)benzoyl]-cyclotriguaiacylene and DMA = dimethylacetamide, while complex [Zn(4ph4py)₂(CF₃COO)(H₂O)]·(CF₃COO)(NMP)₇, where NMP = N-methylpyrrolidone, has a doubly bridged coordination chain structure. Complexes [M(3ph3py)(NO₃)₂]·(NMP)₄ where M = Co or Zn, 3ph3py = tris[3-(3-pyridyl)benzoyl]cyclotriguaiacylene, are isostructural and feature 1D ladder coordination chains. Complexes [Cd₂(4ph4py)₂(NO₃)₄(NMP)]·(NMP)₉(H₂O)₄ and [Co(4ph4py)(H₂O)₂]·(NO₃)₂·(DMF)₂, where DMF = dimethylformamide, both have (3,4)-connected 2D coordination polymers with a rare (4².6²)(4.6²)₂ topology. A 2D coordination polymer with this topology is also found in complex [Co₂(3ph4py)₂(NO₃)(H₂O)₅]·(NO₃)₃·(DMF)₉ where 3ph4py = tris[3-(4-pyridyl)benzoyl]cyclotriguaiacylene. All 2D coordination polymer complexes are interpenetrating or polycatenating. [Co₂(3ph4py)₂(NO₃)(H₂O)₅]³⁺ polymers form a 2D→3D polycatenation showing self-complementary “hand-shake” interactions between the host-type ligands.