Solid state synthesis, thermal, spectral, optical, crystal structure and atomic packing studies of 2-(3-Hydroxyphenyl)-2,3-dihydroquinazolin-4(1H)-one

The environment friendly solid state synthesis is adopted for the synthesis of molecular complex, 2-(3-Hydroxyphenyl)-2,3-dihydroquinazolin-4(1H)-one, (ANHB) with utmost yield. The phase diagram (PD) of anthranilamide (AN) 3-hydroxybenzaldehyde (HB) system gives the compositional behavior of composites in the entire range, and has identified the formation of two eutectics and a molecular complex. The novelty and structural behavior of ANHB was studied using FTIR, NMR, UV-vis, fluorescence, DSC and PXRD techniques. The various thermodynamic characterizations of eutectics and complex are done using the heat of fusion values obtained from DSC. The single crystal XRD (SCXRD) and atomic packing studies of grown ANHB crystal infer that ANHB crystallizes in centro-symmetric triclinic space group P 1 with two molecules in the asymmetric unit and four molecules in the unit cell. The synthesized complex shows fluorescence emission in visible region.