Synthesis, structure, spectroscopic and ferroelectric properties of an acentric polyoxotungstate containing 1:2-type [Sm(α-PW₁₁O₃₉)₂]¹¹⁻ fragment and D-proline components

Yingjie Liu; Hailou Li; Jingli Zhang; Junwei Zhao; Lijuan Chen

doi:10.1016/j.saa.2014.06.076

Synthesis, structure, spectroscopic and ferroelectric properties of an acentric polyoxotungstate containing 1:2-type [Sm(α-PW₁₁O₃₉)₂]¹¹⁻ fragment and D-proline components

Spectrochim Acta A Mol Biomol Spectrosc. 2015 Jan 5:134:101-8. doi: 10.1016/j.saa.2014.06.076. Epub 2014 Jun 24.

Authors

Yingjie Liu¹, Hailou Li², Jingli Zhang², Junwei Zhao³, Lijuan Chen⁴

Affiliations

¹ Institute of Molecular and Crystal Engineering, Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, PR China; College of Medicine, Henan University, Kaifeng, Henan 475004, PR China.
² Institute of Molecular and Crystal Engineering, Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, PR China.
³ Institute of Molecular and Crystal Engineering, Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, PR China; State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China. Electronic address: zhaojunwei@henu.edu.cn.
⁴ Institute of Molecular and Crystal Engineering, Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, PR China. Electronic address: ljchen@henu.edu.cn.

PMID: 25011039
DOI: 10.1016/j.saa.2014.06.076

Abstract

An organic-inorganic hybrid mono-Sm(III) substituted phosphotungstate KNa3[HPro]₇[Sm(α-PW₁₁O₃₉)₂]·Pro·₁₈H₂O (1) (Pro=D-proline) has been synthesized in the conventional aqueous solution and structurally characterized by elemental analyses, inductively coupled plasma atomic emission spectrometry (ICP-AES) analyses, IR spectra, UV spectra, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA) and single-crystal X-ray diffraction. The molecule of 1 consists of a classical 1:2-type [Sm(α-PW₁₁O₃₉)₂](11-) fragment and free D-proline components. It should be pointed out that the synergistic action between the in-situ formed chiral [Sm(α-PW₁₁O₃₉)₂](11-) fragment and chiral D-proline components results in the formation of the chiral 1. The luminescence emission of 1 reveals three characteristic bands that derive from the (4)G₅/₂→(6)H₅/₂, (4)G₅/₂→(6)H₇/₂ and (4)G₅/₂→(6)H₉/₂ transitions of the Sm(III) cation as well as the synergistic contribution of the O→W transitions of [α-PW₁₁O₃₉](7-) moieties and a π(*)-n or π(*)-π transitions of Pro. Its ferroelectric behavior has been measured.

Keywords: Ferroelectricity; Luminescence; Polyoxometalate; Polyoxotungstate; Proline.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Chemistry Techniques, Synthetic
Crystallography, X-Ray
Luminescence
Molecular Structure
Organometallic Compounds / chemistry*
Phosphotungstic Acid / chemistry
Proline / chemistry*
Spectrophotometry, Atomic
Spectrophotometry, Infrared
Spectrophotometry, Ultraviolet
Thermogravimetry
Tungsten / chemistry*
X-Ray Diffraction

Substances

Organometallic Compounds
Phosphotungstic Acid
Proline
Tungsten