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摘要
The aim of this review is to emphasize solvent free or green synthesis, a most efficient utilization of starting materials to give maximum yield, and an alternative route to producing novel promising materials. In this regard the phase diagram study has shown applications in the determination of the precise composition of binary compounds of a specific nature and in the identification of the parameters that affect the crystal growth. To provide an overview worthy of phase diagram, physicochemical, thermal and structure investigations; studies of eleven systems, namely, urea-m-nitrobenzoic acid, urea-p-nitrophenol, urea-resorcinol, benzoin-o-phenylenediamine, pyrene-m-dinitrobenzene, vanillin-p-anisidine, resorcinol-p-dimethylaminobenzaldehyde, benzophenone-diphenylamine, anthracene-picric acid, 8-hydro xyquinoline-salicylic acid and 8-hydroxyqunoline-1,2,3-trihydroxybenzene forming organic complexes, have been reported. In addition, the original data of a newly synthesized complex of m-hydroxybenzaldehyde (HB) and p-chloroaniline (CA) is being reported for the first time. The phase diagram of HB-CA system also shows the formation of a complex in 1:1 M ratio, and two eutectics on either side of the complex. The complex's formation was studied using FTIR, NMR, DSC and powder X-ray diffraction techniques. The thermodynamic parameters such as heat of mixing, entropy of fusion, roughness parameter, interfacial energy and excess thermodynamic functions were calculated using the heat of fusion values. The single crystal growth and the atomic packing studies of some of the complexes have confirmed the formation of complexes. The optical transmittance efficiency and transparency of novel HB-CA complex crystal were found to be 70% and 399 nm, respectively.
- 出版日期2013
