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Published on: February 15, 2016
Structure and spectroscopy of Tb[Au(CN)2]3.3H2O
Peter A Tanner1, Xianju Zhou, Wing-Tak Wong
1Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong S.A.R., PR China.
The Journal of Physical Chemistry. B
|July 21, 2006
Summary
This study details the crystal structure and spectral properties of lanthanide gold cyanide hydrates. Researchers analyzed electronic and vibrational spectra to understand their unique layered structures and optical behavior.
Area of Science:
- Inorganic Chemistry
- Solid-State Chemistry
- Materials Science
Background:
- Lanthanide coordination compounds with cyanide ligands exhibit diverse structural motifs and interesting photophysical properties.
- Understanding the relationship between crystal structure and spectroscopic behavior is crucial for designing new functional materials.
Purpose of the Study:
- To elucidate the crystal structure and characterize the vibrational and electronic spectra of terbium gold cyanide trihydrate (Tb[Au(CN)2]3.3H2O).
- To investigate the spectroscopic properties of related lanthanide compounds (Ln[Au(CN)2]3.3H2O, Ln = Y, Pr, Sm, Eu, Tb) to confirm their isostructural nature.
- To analyze the f-f electronic transitions and vibronic structures in Tb[Au(CN)2]3.3H2O at low temperatures.
Main Methods:
- X-ray crystallography to determine the layered hexagonal structure and coordination environment of Tb3+.
- Infrared (IR) and Raman spectroscopy to study vibrational modes.
- Electronic absorption and emission spectroscopy at variable temperatures (down to 1.5 K).
Main Results:
- Tb[Au(CN)2]3.3H2O crystallizes in a hexagonal P6(3)/mcm space group with a tricapped trigonal prism coordination for Tb3+.
- The series Ln[Au(CN)2]3.3H2O (Ln = Y, Pr, Sm, Eu, Tb) were confirmed to be isostructural.
- Electronic spectra of Eu[Au(CN)2]3.3H2O indicated a D3h spectroscopic site symmetry for Eu3+.
- Detailed interpretation of f-f electronic transitions in Tb[Au(CN)2]3.3H2O and assignment of vibronic bands, particularly those involving water stretching modes.
Conclusions:
- The crystal structure and spectroscopic data are consistent, revealing insights into the electronic and vibrational properties of these lanthanide gold cyanide complexes.
- The study highlights the influence of water molecules on the vibronic structure and the behavior of CN stretching modes.
- The findings contribute to the understanding of structure-property relationships in lanthanide-based coordination compounds.
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