Two NiII Complexes with Interesting Topologies Constructed from 5-Aminoisophthalic Acid with Rigid Bis(imidazole) Ligands

Two new NiII complexes, [Ni2(AIP)2(bib)1.5]·4H2O (1) and [Ni(AIP)(bibp)(H2O)]·H2O (2) (AIP = 5-aminoisophthalic acid, bib = 1,4-bis(1-imidazolyl)benzene and bibp = 4,4'-bis(1-imidazolyl)biphenyl), have been synthesised hydrothermally and characterised by IR, elemental, single-crystal X-ray diffraction, and powder X-ray diffraction analyses. Topology analysis reveals that complex 1 is a 2D bilayer network, containing a new tetranodal (3,3,4,5)-connected (63)2(65·8)(68·82) configuration. Complex 2 exhibits a 2D?3D inclined polycatenate framework based on the 2D 44-sql net. In addition, the thermal stability of the two complexes was also studied.