Effect of N-donor auxiliary ligands on the engineering of crystalline architectures of a series of lead(ii) complexes with 5-amino-2,4,6-triiodoisophthalic acid

Abstract

The aqueous medium reactions of lead(II) nitrate with H 2 ATIBDC as a main ligand and bipy or biim as an auxiliary ligand lead to the two fascinating coordination polymers:and H 2 ATIBDC ¼ 5-amino-2,4,6-triiodoisophthalic acid]. The interesting chiral three-dimensional (3D) network [Pb(ATIBDC)] (3) is obtained in the absence of any auxiliary ligands.Complex 1 is a one-dimensional (1D) helical chain, which further arrays into a 3D supramolecular metal-organic framework (MOF) with a 1D channel through the hydrogen-bonding and strong offset p/p stacking interactions. Furthermore, a 1D hydrogen-bonded helical water chain was found in 1. Interestingly, complex 1 exhibits reversible adsorption/desorption to water molecules. Framework 1 falls within the category of ''recoverable collapsing'' and ''guest-induced re-formation'' frameworks. Complex 2 features a fascinating 3D MOF. It displays a novel four-connected 4 6 6 8 -SOD (sodalite) zeotype network structure with 1D nanotubular channels. Complex 3 crystallizes in the chiral space group P3 1 and possesses a 3D honeycomb-like structure built up from a 1D Pb(II)-carboxylate-bridged helical chain with a 3 1 helix and ATIBDC 2À ligand. The coordination modes of the ATIBDC 2À ligand and crystalline architectures of the complexes are greatly dependent on the auxiliary ligands. The thermal stability and solid state fluorescent properties have been studied. Adsorption/desorption properties reveal that 2 may be used as an adsorbent material for some guest molecules. The study broadens the still very limited use of H 2 ATIBDC as a spacer and lead(II) ion for crystal engineering of MOFs with channels and cavities. These compounds represent the first examples of lead(II) complexes with H 2 ATIBDC.

Synthesis, structure and properties of three 1D d10 metal–organic coordination polymers with 5-amino-2,4,6-triiodoisophthalic acid

“…On the basis of the above considerations, as a continual study of the previous work focusing on the main group p block metal ion lead(II) with the ATIBDC 2À ligand [29], in this contribution we will describe the preparation, crystallography and properties of a series of 1D d 10 metal-organic coordination polymers with H 2 ATIBDC in order to further understand the coordination chemistry of H 2 ATIBDC. With the introduction of different kinds of auxiliary imidazole ligands: the chelating ligand 2,2 0 -biimidazole (biim) and the flexible bridging spacer 1,1 0 -(1,4-butanediyl)bis(imidazole) (bbi) (Scheme S1), three new 1D coordination polymers: (2) and [Cd(ATIBDC)(bbi)] n (3), have been obtained.…”

Preparation and characterization of two supramolecular complexes with 5-amino-2,4,6-triiodoisophthalic acid under N-donor auxiliary ligand intervention

“…We had finished a systematic study focusing on the p-block metal Pb(II) with ATIBDC 2À ligand [19]. In this paper, we will describe our recent research results of the synthesis, crystallography, and properties of two supramolecular complexes with H 2 ATIBDC in order to further understand the coordination chemistry of H 2 ATIBDC with d 10 metal ions, the roles of three I atoms in the supramolecular assembly.…”

Synthesis, crystal structure, and luminescent properties of metal complexes bearing 2,6-pyridine-diacylhydrazide ligands: supramolecular assemblies via intermolecular interactions

“…Among these ligands, aromatic carboxylate-containing or amide-containing ligands are often employed due to their facile coordination to metal ions and inclination to form H-bonds of COOHÁÁÁN, COOHÁÁÁO, and N-HÁÁÁO, etc., as well as the potential p-p stacking interaction between the aromatic rings [14,17,19,23,30,31]. N,N 0 -bis(salicyl)-2,6-pyridine-dicarbohydrazide (H 6 L) ligand possesses eleven potential donor groups (one pyridine group, four carbonyl groups, two phenolic groups, and four amide moieties).…”

“…The process of the self-assembly of a supramolecular framework is based on the extension of individual molecules by noncovalent or weak covalent interactions, including Van der Waals, electrostatic and hydrophobic interactions, hydrogen bonds, as well as p-p and ion-p stacking [11][12][13][14][15][16][17][18][19][20][21]. Among these, hydrogen bonding and p-p stacking interactions have been considered to play active roles in the formation of ordered supramolecular chains, layers, and three-dimensional frameworks, the research on which is of great interest for the development of supramolecular chemistry [22][23][24][25][26][27][28][29].…”