Synthesis, Structural Characterization and Ligand-Enhanced Photo-Induced Color-Changing Behavior of Two Hydrogen-Bonded Ho(III)-Squarate Supramolecular Compounds

Synthesis, Structural Characterization and Ligand-Enhanced Photo-Induced Color-Changing Behavior of Two Hydrogen-Bonded Ho(III)-Squarate Supramolecular Compounds

Two coordination polymers (CPs) with chemical formulas, [Ho<sub>2</sub>(C<sub>4</sub>O<sub>4</sub>)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)(H<sub>2</sub>O)<sub>8</sub>]&#183;4H<sub>2</sub>...

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Main Authors: Chih-Chieh Wang, Szu-Yu Ke, Yun Feng, Mei-Lin Ho, Chung-Kai Chang, Yu-Chun Chuang, Gene-Hsiang Lee
Format: Article
Language:English
Published: MDPI AG 2019-08-01
Series:Polymers
Subjects:
coordination polymer
metal-organic framework
hydrogen bond
supramolecular architecture
color change
Online Access:https://www.mdpi.com/2073-4360/11/8/1369
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spelling doaj-4e601dc5cf624fdb847a0f7b731994552020-11-25T02:53:05ZengMDPI AGPolymers2073-43602019-08-01118136910.3390/polym11081369polym11081369Synthesis, Structural Characterization and Ligand-Enhanced Photo-Induced Color-Changing Behavior of Two Hydrogen-Bonded Ho(III)-Squarate Supramolecular CompoundsChih-Chieh Wang0Szu-Yu Ke1Yun Feng2Mei-Lin Ho3Chung-Kai Chang4Yu-Chun Chuang5Gene-Hsiang Lee6Department of Chemistry, Soochow University, Taipei 11102, TaiwanDepartment of Chemistry, Soochow University, Taipei 11102, TaiwanDepartment of Chemistry, Soochow University, Taipei 11102, TaiwanDepartment of Chemistry, Soochow University, Taipei 11102, TaiwanInstrumentation Center, National Taiwan University, Taipei 10617, TaiwanInstrumentation Center, National Taiwan University, Taipei 10617, TaiwanMaterials Science Group, National Synchrotron Radiation Research Center, Hsinchu 30076, TaiwanTwo coordination polymers (CPs) with chemical formulas, [Ho<sub>2</sub>(C<sub>4</sub>O<sub>4</sub>)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)(H<sub>2</sub>O)<sub>8</sub>]&#183;4H<sub>2</sub>O (<b>1</b>) and [Ho(C<sub>4</sub>O<sub>4</sub>)<sub>1.5</sub>(H<sub>2</sub>O)<sub>3</sub>] (<b>2</b>), (C<sub>4</sub>O<sub>4</sub><sup>2&#8722;</sup> = dianion of squaric acid, C<sub>2</sub>O<sub>4</sub><sup>2&#8722;</sup> = oxalate), have been synthesized and their structures were determined by single-crystal X-ray diffractometer (XRD). In compound <b>1</b>, the coordination environment of Ho(III) ion is eight-coordinate bonded to eight oxygen atoms from two squarate, one oxalate ligands and four water molecules. The squarates and oxalates both act as bridging ligands with &#956;<sub>1,2</sub>-<i>bis</i>-monodentate and <i>bis</i>-chelating coordination modes, respectively, connecting the Ho(III) ions to form a one-dimensional (1D) ladder-like framework. Adjacent ladders are interlinked via O&#8722;H&#8901;&#8901;&#8901;O hydrogen bonding interaction to form a hydrogen-bonded two-dimensional (2D) layered framework and then arranged orderly in an AAA manner to construct its three-dimensional (3D) supramolecular architecture. In compound <b>2</b>, the coordination geometry of Ho(III) is square-antiprismatic eight coordinate bonded to eight oxygen atoms from five squarate ligands and three water molecules. The squarates act as bridging ligands with two coordination modes, &#956;<sub>1,2,3</sub>-<i>tris</i>monodentate and &#956;<sub>1,2</sub>-<i>bis</i>-monodentate, connecting the Ho(III) ions to form a 2D bi-layered framework. Adjacent 2D frameworks are then parallel stacked in an AAA manner to construct its 3D supramolecular architecture. Hydrogen bonding interactions between the squarate ligands and coordinated water molecules in <b>1</b> and <b>2</b> both play important roles on the construction of their 3D supramolecular assembly. Compounds <b>1</b> and <b>2</b> both show remarkable ligand-enhanced photo-induced color-changing behavior, with their pink crystals immediately turning to yellow crystals under UV light illumination.https://www.mdpi.com/2073-4360/11/8/1369coordination polymermetal-organic frameworkhydrogen bondsupramolecular architecturecolor change
collection DOAJ
language English
format Article
sources DOAJ
author Chih-Chieh Wang
Szu-Yu Ke
Yun Feng
Mei-Lin Ho
Chung-Kai Chang
Yu-Chun Chuang
Gene-Hsiang Lee
spellingShingle Chih-Chieh Wang
Szu-Yu Ke
Yun Feng
Mei-Lin Ho
Chung-Kai Chang
Yu-Chun Chuang
Gene-Hsiang Lee
Synthesis, Structural Characterization and Ligand-Enhanced Photo-Induced Color-Changing Behavior of Two Hydrogen-Bonded Ho(III)-Squarate Supramolecular Compounds
Polymers
coordination polymer
metal-organic framework
hydrogen bond
supramolecular architecture
color change
author_facet Chih-Chieh Wang
Szu-Yu Ke
Yun Feng
Mei-Lin Ho
Chung-Kai Chang
Yu-Chun Chuang
Gene-Hsiang Lee
author_sort Chih-Chieh Wang
title Synthesis, Structural Characterization and Ligand-Enhanced Photo-Induced Color-Changing Behavior of Two Hydrogen-Bonded Ho(III)-Squarate Supramolecular Compounds
title_short Synthesis, Structural Characterization and Ligand-Enhanced Photo-Induced Color-Changing Behavior of Two Hydrogen-Bonded Ho(III)-Squarate Supramolecular Compounds
title_full Synthesis, Structural Characterization and Ligand-Enhanced Photo-Induced Color-Changing Behavior of Two Hydrogen-Bonded Ho(III)-Squarate Supramolecular Compounds
title_fullStr Synthesis, Structural Characterization and Ligand-Enhanced Photo-Induced Color-Changing Behavior of Two Hydrogen-Bonded Ho(III)-Squarate Supramolecular Compounds
title_full_unstemmed Synthesis, Structural Characterization and Ligand-Enhanced Photo-Induced Color-Changing Behavior of Two Hydrogen-Bonded Ho(III)-Squarate Supramolecular Compounds
title_sort synthesis, structural characterization and ligand-enhanced photo-induced color-changing behavior of two hydrogen-bonded ho(iii)-squarate supramolecular compounds
publisher MDPI AG
series Polymers
issn 2073-4360
publishDate 2019-08-01
description Two coordination polymers (CPs) with chemical formulas, [Ho<sub>2</sub>(C<sub>4</sub>O<sub>4</sub>)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)(H<sub>2</sub>O)<sub>8</sub>]&#183;4H<sub>2</sub>O (<b>1</b>) and [Ho(C<sub>4</sub>O<sub>4</sub>)<sub>1.5</sub>(H<sub>2</sub>O)<sub>3</sub>] (<b>2</b>), (C<sub>4</sub>O<sub>4</sub><sup>2&#8722;</sup> = dianion of squaric acid, C<sub>2</sub>O<sub>4</sub><sup>2&#8722;</sup> = oxalate), have been synthesized and their structures were determined by single-crystal X-ray diffractometer (XRD). In compound <b>1</b>, the coordination environment of Ho(III) ion is eight-coordinate bonded to eight oxygen atoms from two squarate, one oxalate ligands and four water molecules. The squarates and oxalates both act as bridging ligands with &#956;<sub>1,2</sub>-<i>bis</i>-monodentate and <i>bis</i>-chelating coordination modes, respectively, connecting the Ho(III) ions to form a one-dimensional (1D) ladder-like framework. Adjacent ladders are interlinked via O&#8722;H&#8901;&#8901;&#8901;O hydrogen bonding interaction to form a hydrogen-bonded two-dimensional (2D) layered framework and then arranged orderly in an AAA manner to construct its three-dimensional (3D) supramolecular architecture. In compound <b>2</b>, the coordination geometry of Ho(III) is square-antiprismatic eight coordinate bonded to eight oxygen atoms from five squarate ligands and three water molecules. The squarates act as bridging ligands with two coordination modes, &#956;<sub>1,2,3</sub>-<i>tris</i>monodentate and &#956;<sub>1,2</sub>-<i>bis</i>-monodentate, connecting the Ho(III) ions to form a 2D bi-layered framework. Adjacent 2D frameworks are then parallel stacked in an AAA manner to construct its 3D supramolecular architecture. Hydrogen bonding interactions between the squarate ligands and coordinated water molecules in <b>1</b> and <b>2</b> both play important roles on the construction of their 3D supramolecular assembly. Compounds <b>1</b> and <b>2</b> both show remarkable ligand-enhanced photo-induced color-changing behavior, with their pink crystals immediately turning to yellow crystals under UV light illumination.
topic coordination polymer
metal-organic framework
hydrogen bond
supramolecular architecture
color change
url https://www.mdpi.com/2073-4360/11/8/1369
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