Construction of multifunctional lanthanide coordination polymers with hydrazide ligand

การคิดค้นสารประกอบแลนทาไนด์โคออดิเนชันพอลิเมอร์เชิงหลายหน้าที่กับลิแกนด์ไฮดราไซด์

Name: Chatphorn Theppitak

keyword: Coordination polymers

; Lanthanide

; Hydrazide

; Photoluminescence

; Magnetism

; CO2 adsorption

Abstract: In this research, a range of lanthanide complexes incorporating hydrazide ligands have been synthesized and their photoluminescent sensing, magnetic, and CO2 adsorption properties were investigated. Three series of lanthanide (III) coordination complexes with hydrazide ligands have been synthesized and structurally characterized. The first series, [Ln(bzz)(NO3)(NO3)2] (1Ln; Ln = 1Sm, 2Eu, 3Gd, 4Tb, 5Dy), were obtained by slow evaporation methods at room temperature and feature a discreate structure. The complex molecules are assembled into a 3D supramolecular structure via intermolecular N−HO hydrogen bonds. The complexes in second series, [Ln(bzz)(ben)3(H2O)]H2O (2Ln; Ln = 6Pr, 7Nd, 8Sm, 9Eu, 10Gd, 11Tb, 12Dy, 13Er), were synthesized by hydrothermal methods at 110 oC. The bzz ligands occurred in situ generated to benzoate (ben) ligands and both bzz and ben ligands are bridged the central Ln3+ ions to form a one-dimensional (1D) polymeric chain. The third series of the complexes, [Ln3(ben)3] (3Ln; Ln = 14Eu, 15Gd, 16Tb, 17Dy, 18Er, 19Tm, 20Yb, 21Lu), were also formed at 145 oC by using hydrothermal method. The bzz ligand was found to be completely hydrolyzed to generate the ben ligand under hydrothermal conditions. The coordination assemblies feature a 1D zigzag chain built up by a low coordination number of the 6- and 7-fold of Ln3+ centers. It is interesting that 2Ln can be transformed into the 3Ln structure upon heating at 400 °C Moreover, the Eu- and Tb-containing complexes have shown red and green luminescence emissions in the solid state at room temperature under UV radiation. They could be used as fluorescent probes for the selective detections of acetone and Co2+ ions. Concurrently, the Gd (10Gd, 15Gd) and Dy (12Dy, 17Dy) based complexes exhibit weak antiferromagnetic interactions between the central Ln3+ ions. Furthermore, two novel lanthanide complexes bearing the bzz and ben ligands, [Sm2(bzz)(ben)6(H2O)3]0.5H2O (22Sm) and [Eu(bbz)(ben)3)] (23Eu), were synthesized through in situ ligand formation under hydrothermal conditions. Complex 22Sm displays a 1D double-chain structure, while complex 23Eu exhibits a 3D channel with a 4-connected (66) dia topology. High-pressure CO2 sorption of 22Sm at 298 K was found to be 376.7 cm3 g-1 (42.5 wt%) under a pressure of 50 bar. Whereas, 23Eu exhibits red emission in a solid state at room temperature

Thammasat University. Thammasat University Library

Address: BANGKOK

Email: preserv@tu.ac.th

Name: Kittipong Chainok

Role: advisor

Name: Supakorn Boonyuen

Role: co-advisor

Name: Winya Dungkaew

Role: co-advisor

Created: 2022

Modified: 2023-12-01

Issued: 2023-12-01

วิทยานิพนธ์/Thesis

application/pdf

DOI: 10.14457/TU.the.2022.582

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Chemistry

Grantor: Thammasat University

©copyrights Thammasat University

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