نتایج جستجو برای: calixarene
تعداد نتایج: 421 فیلتر نتایج به سال:
Calixarene-Ti complexes were grafted onto SiO2 (0.18-0.24 Ti nm-2) to form isolated and accessible Ti centers persistently coordinated to multidentate calixarene ligands. Grafted Ti-tert-butylcalix[4]arenes gave Ti K-edge absorption spectra with pre-edge features at 4968.6-4968.9 eV, independently of Ti surface density and of their use in epoxidation catalysis. The structure and reactivity of g...
Introduction Calixarene, a third generation receptor easily synthesized by condensation of phenol and formaldehyde, provides a peerless three dimensional structure with several functional sites and gives flexibility to act as a specific receptor (Fig. 1)1-10. It has a chemical and thermal stability. It is insoluble in aqueous phase while slightly soluble in organic solvents, melts at high tempe...
In this research, Quantum-mechanical calculations were performed at the HF method with the 6-31+G*basis set and at the B3LYP method with the 6-31+G* basis set in the gas phase and five solvents such as water, DMSO, methanol, ethanol and dichloromethane at six temperatures. According to these theoretical results of IR, we extracted thermo chemical parameters such as enthalpy (∆H Kcal/mol), Gibbs...
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