Design, Syntheses, Structures And Properties Of Transition Metal Coordination Compounds Based On 5-aminoisophthalic Acid

In recent years, the design and synthesis of supramolecular networks that provide new shapes, sizes and chemical environments as well as the searches for new molecular-based functional materials causes an increasing interest in supramolecular chemistry. This is not only due to their abundant structural diversity, but also they are fundamental steps to discover and construct various fundamental supramolecular devices or technologically useful materials.Carboxylic acid ligands have been commonly used in the construction of supramolecular complexes which may be due to their functional groups potentially capable of participating in both coordination bonding and weaker non-covalent interactions. 5-aminoisophthalic acid is a fine bridging ligand with multiple coordination modes and can be used to construct novel supramolecular compounds with particular function.In the present thesis, the polycarboxylate ligand 5-aminoisophthalic acid and chelated ligand, such as 1, 10-phenanthroline and 2, 2'-bipyridine, etc, were used. Two N atoms from the chelate ligand (phen or bipy) may occupy two coordination positions of metal ions, thus the feasibility of coordination is counteracted at space. So, low dimensional or layered compounds can be synthesized.This paper consists of three sections except the introduction as follows: Chapter 1: Two novel polymers 1 [Cd(Haip)2(H2O)2]·2H2O﹠2 [Mn2(aip)2(H2O)2] (H2aip = 5-aminoisophthalic acid) were synthesized through the self-assembly with 5-aminoisophthalic acid as bridged ligand. Complex 1 is a two-dimensional framework which is quite different from the reported complex [Cd(aip)(H2O)]·H2O. The Cd atom is six-coordinated with a greatly distorted octahedral geometry. Complex 2 exhibits a 1D chain structure, the Mn atom is six-coordinated. Three-dimensional novel supramolecular frameworks were constructed by hydrogen bonds and theπ-πinteraction in the complexes 1 and 2.Chapter 2: Five supramolecular complexes were synthesized by using rigid ligand 5-aminoisophthalic acid and chelating bidentate ligand 1,10-phenanthroline: 3-4 [M(aip)(phen)(H2O)3]·3H2O﹠ 5 [Zn(aip)(phen)]·3H2O 6 [Mn(aip)(phen)(H2O)]·H2O﹠ 7 [Cu(aip)(phen)(H2O)]·3H2O ( M= Co,Ni,aip = 5-aminoisophthalate,phen = 1,10-phenanthroline). Both 3 and 4 are mononuclear complexes. The Zn (II) centre of complex 5 lies in a distorted tetrahedron configuration. Complex 6 is a 1D chain structure, and complex 7 is a two-dimensional supramolecular network through intermolecular hydrogen bonds. They have the same ligands but have different coordination environment around the metal ion. So, they display unidentical structures.Chapter 3: Two supramolecular complexes were synthesized by using bridged ligand 5-aminoisophthalic acid, 2,2'-bipyridine and 3-amino-1,2,4-triazole: 8 [Cu(Haip)(2,2'-bipy)(H2O)]·3H2O, 9 [Zn(aip)(atz)]·3H2O (H2aip = 5-aminoisophthalic acid; atz = 3-amino-1,2,4-triazole). In complex 8, the Cu atom is five-coordinated. In complex 9, the Zn (II) centre lies in a distorted [ZnN2O2] tetrahedral coordination sphere with two oxygen atoms and one nitrogen atom from three aip ligands as well as one nitrogen atom from one atz ligand.