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Syntheses and Properties of Coordination Polymers Based on a Long Rigid N-heterocyclic Ligand

Author: HanGang
Tutor: HouHongWei
School: Zhengzhou University
Course: Inorganic Chemistry
Keywords: coordination polymers rigid N-heterocyclic ligand channels thermochemical stability catalytic performance
CLC: O634
Type: Master's thesis
Year: 2013
Downloads: 10
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Abstract


During the recent decades, the direction of the development of the coordination polymers is toward functional coordination polymers with specific properties. Porous and large channel-based polymers not only have remarkable architectures and, more importantly, such coordination polymers have the actual value of the application in fluorescence, molecular recognition, gas storage, conductivity, nonlinear optical materials and exchange adsorption. So people show great interest in design and synthesis of coordination polymers besides exploring related properties. In this paper, we chose a long rigid ligand2,6-bis(3-(pyrid-3-yl)-1,2,4-triazolyl) pyridine (H2bptp) with transition metal ions in the reaction under solvothermal conditions to construct the coordination polymers with helix channels. And then using mixed ligand strategy, by the introduction of rigid aromatic carboxylic acids, the coordination polymers with novel structure were obtained. We also investigated systematic study and analysis of synthesis law about related coordination polymers, and explored some of the properties of the polymers.This paper includes the following three parts:1. The combination of rigid N-heterocyclic ligand2,6-bis (3-(pyrid-3-yl)-1,2,4-triazolyl) pyridine (H2bptp) as a single ligand with metal ions affords9coordination polymers with helix channels under solvothermal conditions. In the polymer8, we found that a slightly distorted rectangular channel with the four central metal ions in four vertices of the rectangle and the coordinated water molecules in the center of the diagonal of the rectangular channel. And the size of the rectangular channel is about4.699A×4.2754A. The polymer8may be a potential of gas adsorbent and heterogeneous catalyst. By introduction of rigid aromatic carboxylic ancillary ligands, two new polymers were obtained with secondary building units including H2bptp and metal ions, wherein the polymer10contains channel structure like "folding paper lantern".2. The solid-state fluorescences of the ligand H2bptp, the corresponding auxiliary acids and polymers containing d10electronic configuration have also been investigated. The impact about the ligand and the central metal ions were discussed.3. Thermal and chemical stability of the polymer2,3were performed; the reasons that the polymers constructed of rigid N-heterocyclic ligand can exist stably in conventional solvents and alkali environments were presented. Catalytic performances of polymers1,3,5,7,8and11were also studied. Furthermore, the performances of polymers constructed of rigid N-heterocyclic ligand in this regard were discussed. The possible causes that the catalytic efficiency of coordination polymers is different in the same catalytic system were analyzed.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Elements of the organic polymer
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