Silicotungstic acid nanoparticles dispersed in the micropores of Cr-pillared clay as efficient heterogeneous catalyst for the solvent free synthesis of 1,4-dihydropyridines

- Cr-P clay served as efficient support for dispersion of silicotungstic acid.
- IR and UV-Vis study illustrates the structural integrity of the STA particles.
- The interlayer spacing of Cr-P was retained after incorporation of STA particles.
- The particle size of the supported STA is in the range of 15-25 nm.
- The STA/Cr-P material highly efficient catalyst for synthesis of 1,4-dihydropyridines.