TY - JOUR
T1 - Synthesis and Structural Analysis of Novel Phosphonium Hexatungstate Complexes
AU - Saha, Sumit
AU - Zakharov, Lev N.
AU - Captain, Burjor
AU - Keszler, Douglas A.
N1 - Funding Information:
This material is based upon the work supported by the National Science Foundation and Center for Sustainable Materials Chemistry under Grant No. CHE-1102637.
Publisher Copyright:
© 2020, Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2021/5
Y1 - 2021/5
N2 - Sodium tungstate reacted with tetramethyl- and tetrabutyl-phosphonium bromide in presence of hydrochloric acid to afford two new phosphonium hexatungstate compounds ((CH3)4P)2W6O19, 1, and ((CH3CH2CH2CH2)4P)2W6O19, 2, respectively. Under similar conditions, sodium tungstate reacted with methyltriphenyl-, allyltriphenyl-, butyltriphenyl- and benzyltriphenyl-phosphonium bromides to yield four new phosphonium hexatungstate compounds (CH3Ph3P)2W6O19, 3, (CH2CHCH2Ph3P)2W6O19, 4, (CH3CH2CH2CH2Ph3P)2W6O19, 5, and (C6H5CH2Ph3P)2W6O19, 6, respectively. All six compounds appeared to be stable in air, and were structurally characterized by a combination of FTIR, elemental analyses, and single-crystal X-ray diffraction analyses. The steric effect of the phosphonium cation was investigated and found to cause no significant change on the average bond distances of the hexatungstate anion. The crystal structure analyses of these compounds showed that hexatungstate anions were isolated and the distance between the anions increases with increase in the bulkiness of the surrounding phosphonium cations. Moreover, thermal stability and heat absorption of all six compounds were evaluated using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC).
AB - Sodium tungstate reacted with tetramethyl- and tetrabutyl-phosphonium bromide in presence of hydrochloric acid to afford two new phosphonium hexatungstate compounds ((CH3)4P)2W6O19, 1, and ((CH3CH2CH2CH2)4P)2W6O19, 2, respectively. Under similar conditions, sodium tungstate reacted with methyltriphenyl-, allyltriphenyl-, butyltriphenyl- and benzyltriphenyl-phosphonium bromides to yield four new phosphonium hexatungstate compounds (CH3Ph3P)2W6O19, 3, (CH2CHCH2Ph3P)2W6O19, 4, (CH3CH2CH2CH2Ph3P)2W6O19, 5, and (C6H5CH2Ph3P)2W6O19, 6, respectively. All six compounds appeared to be stable in air, and were structurally characterized by a combination of FTIR, elemental analyses, and single-crystal X-ray diffraction analyses. The steric effect of the phosphonium cation was investigated and found to cause no significant change on the average bond distances of the hexatungstate anion. The crystal structure analyses of these compounds showed that hexatungstate anions were isolated and the distance between the anions increases with increase in the bulkiness of the surrounding phosphonium cations. Moreover, thermal stability and heat absorption of all six compounds were evaluated using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC).
KW - Inorganic cluster
KW - Phosphonium bromide
KW - Polyoxometalate complex
KW - Sodium tungstate
KW - X-ray diffraction
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U2 - 10.1007/s10876-020-01835-2
DO - 10.1007/s10876-020-01835-2
M3 - Article
AN - SCOPUS:85104301131
VL - 32
SP - 693
EP - 702
JO - Journal of Cluster Science
JF - Journal of Cluster Science
SN - 1040-7278
IS - 3
ER -