Related Experiment Video
Updated: May 15, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
Inorganic-organic hybrids of the phosphotungstate Keggin anion and a Schiff base cation
Neeraj Kumar Mishra1, Rishukumar Panday2, Sabbani Supriya1
1School of Physical Sciences, Jawaharlal Nehru University, New Delhi - 110067, India. ssabbani@jnu.ac.in.
Abstract:
We present two organic-inorganic hybrids [C9H9N4O]3[PW12O40]·C9H8N4O·4CH3OH (1) and [C9H9N4O]3[PW12O40]·C9H8N4O (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 g-value of 2.0023, characteristic of a free radical species. The attempted spin-trapping reaction of compound 2 with C9H18NO [(2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO)] resulted in the formation of single crystals of [C9H18NO]3[PW12O40] (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.
Related Concept Videos
Valence Bond Theory
Hybridization of Atomic Orbitals II
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Predicting Molecular Geometry
Gravimetry: Inorganic And Organic Precipitating Agents

