Lanthanide complexes of a steroid-substituted benzocrown ether were synthesised. The metal-to-ligand ratio of all the metal complexes is 1∶1. The ligand 4′-[(cholesteryloxy)carbonyl]-benzo-15-crown-5 is a monotropic...Lanthanide complexes of a steroid-substituted benzocrown ether were synthesised. The metal-to-ligand ratio of all the metal complexes is 1∶1. The ligand 4′-[(cholesteryloxy)carbonyl]-benzo-15-crown-5 is a monotropic liquid crystal, displaying a cholesteric mesophase. The lanthanide complexes with nitrate counter-ions form a highly viscous mesophase, decomposing at the clearing point. The transition temperatures change as a function of the lanthanide ion. The corresponding lanthanide complexes with dodecylsulphate (DOS) counter-ions do not form a mesophase. In both cases, the metal complexes have a much lower melting point than the parent ligand.展开更多
The aggregating properties of Cz-C-n (n = 3, 6, 10) have been investigated by means of fluorescence method in DMSO-H2O binary solvent. The measured CAC and C F values indicate that the aggregating tendency of the amp...The aggregating properties of Cz-C-n (n = 3, 6, 10) have been investigated by means of fluorescence method in DMSO-H2O binary solvent. The measured CAC and C F values indicate that the aggregating tendency of the amphiphilic compounds Cz-C-n containing crown ether increases with the length of alkyl chains, similar to that of carbazole compounds with long alkyl chains.展开更多
A novel super-molecular complex, [Na(DB18C6)(CH3CN)]2Mo6O19, was obtained by solvothermal reaction and characterized by elementary analysis, IR, 1H NMR, gumbc spectrum and X-Ray diffraction experiment. The compound cr...A novel super-molecular complex, [Na(DB18C6)(CH3CN)]2Mo6O19, was obtained by solvothermal reaction and characterized by elementary analysis, IR, 1H NMR, gumbc spectrum and X-Ray diffraction experiment. The compound crystallizes in monoclinic space group P21 / n with a=1.187 1(3) nm, b=2.096 3(6) nm, c=1.415 8(4) nm, β=110.854(5)° and Z=4. The complex contains four basic units: Na+, CH3CN, DB18C6和Mo6O192-. Sodium ions located in the cavity of dibenzo-18-crown-6 with 6 Na-O bonds and the crown ether-sodium ion complex is supported on the terminal oxygen atoms of the typical Lindqvist isopolyanion Mo6O192- via the coordinative interactions. Mo6O192- located between two DB18C6 and led to the formation of the "hamburger" structure. The crystal is stabilized by van der waals force and interaction of π-π system. CCDC: 272936.展开更多
文摘Lanthanide complexes of a steroid-substituted benzocrown ether were synthesised. The metal-to-ligand ratio of all the metal complexes is 1∶1. The ligand 4′-[(cholesteryloxy)carbonyl]-benzo-15-crown-5 is a monotropic liquid crystal, displaying a cholesteric mesophase. The lanthanide complexes with nitrate counter-ions form a highly viscous mesophase, decomposing at the clearing point. The transition temperatures change as a function of the lanthanide ion. The corresponding lanthanide complexes with dodecylsulphate (DOS) counter-ions do not form a mesophase. In both cases, the metal complexes have a much lower melting point than the parent ligand.
基金We thank the National Natural Science Foundation of China. The foundation of the Ministry of Science and Technology of China (grant No. G2000078104 and No. G2000077502) for financial supports.
文摘The aggregating properties of Cz-C-n (n = 3, 6, 10) have been investigated by means of fluorescence method in DMSO-H2O binary solvent. The measured CAC and C F values indicate that the aggregating tendency of the amphiphilic compounds Cz-C-n containing crown ether increases with the length of alkyl chains, similar to that of carbazole compounds with long alkyl chains.
文摘A novel super-molecular complex, [Na(DB18C6)(CH3CN)]2Mo6O19, was obtained by solvothermal reaction and characterized by elementary analysis, IR, 1H NMR, gumbc spectrum and X-Ray diffraction experiment. The compound crystallizes in monoclinic space group P21 / n with a=1.187 1(3) nm, b=2.096 3(6) nm, c=1.415 8(4) nm, β=110.854(5)° and Z=4. The complex contains four basic units: Na+, CH3CN, DB18C6和Mo6O192-. Sodium ions located in the cavity of dibenzo-18-crown-6 with 6 Na-O bonds and the crown ether-sodium ion complex is supported on the terminal oxygen atoms of the typical Lindqvist isopolyanion Mo6O192- via the coordinative interactions. Mo6O192- located between two DB18C6 and led to the formation of the "hamburger" structure. The crystal is stabilized by van der waals force and interaction of π-π system. CCDC: 272936.
