Inorganic–organic hybrids of the phosphotungstate Keggin anion and a Schiff base cation
We present two organic-inorganic hybrids [C<sub>9</sub>H<sub>9</sub>N<sub>4</sub>O]<sub>3</sub>[PW<sub>12</sub>O<sub>40</sub>]·C<sub>9</sub>H<sub>8</sub>N<sub>4</sub>O·4CH<sub>3</sub>OH (1) and [C<sub>9</sub>H<sub>9</sub>N<sub>4</sub>O]<sub>3</sub>[PW<sub>12</sub>O<sub>40</sub>]·C<sub>9</sub>H<sub>8</sub>N<sub>4</sub>O (2) consisting of 4-(salicylideneamino)-1,2,4-triazole cations and Keggin type phosphotungstate anions. Compounds 1 and 2 are characterized by NMR, UV-Vis, IR spectroscopy, and single-crystal X-ray diffraction studies. The crystal structures of compounds 1 and 2 show additional organic Schiff base molecules as lattice components. The analysis of the electron paramagnetic resonance (EPR) spectra of compounds 1 and 2 shows a peak at a <i>g</i>-value of 2.0023, characteristic of a free radical species. The attempted spin-trapping reaction of compound 2 with C<sub>9</sub>H<sub>18</sub>NO [(2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO)] resulted in the formation of single crystals of [C<sub>9</sub>H<sub>18</sub>NO]<sub>3</sub>[PW<sub>12</sub>O<sub>40</sub>] (3) consisting of the TEMPOnium cation and phosphotungstate anion. Finally, compound 2 has been used as a radical initiator for free radical polymerization of styrene to polystyrene.
Authors
- Rishukumar Panday (ORCID: https://orcid.org/0000-0001-9784-8478)
- Sabbani Supriya
- Neeraj Kumar Mishra (ORCID: https://orcid.org/0000-0002-5562-7519)
Institutions
- Jawaharlal Nehru University (IN)
- Indian Institute of Science Education and Research Pune (IN)
Publication Details
- Journal
- Dalton Transactions
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d4dt03480e
- Citations
- 2
- Primary Topic
- Polyoxometalates: Synthesis and Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.04