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Self‐Assembled Tetrameric Lanthanide‐Containing Germanotungstates [(Ln 2 GeW 10 O 38 ) 4 (W 3 O 8 )(OH) 4 (H 2 O) 2 ] 26− : Syntheses, Crystal Structure, Photoluminescence and Electrochemical Properties.
Author(s) -
Khan Imran,
Kaushik Reetam,
Tiwari Ranjay K.,
Mbomekallé Israël,
Oliveira Pedro de,
Matono Takashi,
Ooyama Haruka Egawa,
Sadakane Masahiro,
Hussain Firasat
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201903379
Subject(s) - lanthanide , isostructural , crystallography , infrared spectroscopy , triclinic crystal system , powder diffraction , spectroscopy , thermogravimetric analysis , photoluminescence , crystal structure , materials science , analytical chemistry (journal) , fourier transform infrared spectroscopy , chemistry , nuclear chemistry , inorganic chemistry , ion , organic chemistry , physics , optoelectronics , quantum mechanics
A series of six lanthanide‐containing germanotungstates of the formula: [(Ln 2 GeW 10 O 38 ) 4 (W 3 O 8 )(OH) 4 (H 2 O) 2 ] 26− (Ln=Sm ( 1 ), Eu ( 2 ), Gd ( 3 ), Tb ( 4 ), Dy ( 5 ), Ho ( 6 ) have been synthesized under ambient conditions. The synthetic procedure involves the use of trilacunary Na 10 [A‐α‐GeW 9 O 34 ]⋅16H 2 O as a preformed precursor along with lanthanide salts in 0.5 M potassium chloride solution. The interaction of the trilacunary Na 10 [A‐α‐GeW 9 O 34 ]⋅16H 2 O with the lanthanide salts leads to the formation of a tetrameric structure with four [GeW 10 O 36 ] 8− dilacunary Keggin units incorporating eight lanthanide ions and three additional tungsten atoms. All the polyanions were structurally characterized by Fourier‐transform infrared spectroscopy (FT‐IR), Single Crystal X‐ray Diffraction (SC‐XRD), UV/Visible spectroscopy, thermogravimetric analysis (TGA), electrochemistry, Electron‐spray ionization mass spectroscopy (ESI‐MS), Powder X‐ray diffraction (PXRD) and photoluminescence. FT‐IR spectroscopy reveals that all the polyanions are isomorphous and SC‐XRD shows that all the polyanions are isostructural and crystalize in the triclinic crystal system with P 1 ‾space group. Some of the polyanions show good photoluminescence properties. The cyclic voltammograms (CVs) of all the six compounds exhibit the same shape, each being composed of a pronounced reduction wave.