New alkaline earth metal cryptates [ML](NO3)2 ·2H2O (M=Ca^2+, Sr^2+, Ba^2+; L = 1, 4,12,15,18, 26, 31, 39, 42, 43, 44-undecaazapentacyclo- [ 13.13.13.1^6,10 .1^20,24 .1^33,37 ]-tetratetraconta -4, 6, 8, 10...New alkaline earth metal cryptates [ML](NO3)2 ·2H2O (M=Ca^2+, Sr^2+, Ba^2+; L = 1, 4,12,15,18, 26, 31, 39, 42, 43, 44-undecaazapentacyclo- [ 13.13.13.1^6,10 .1^20,24 .1^33,37 ]-tetratetraconta -4, 6, 8, 10(44), 11, 18, 20, 22, 24(43), 25, 31, 33, 35, 37(42), 38-pentadecaene) were synthesized by [2 + 3 ] template condensation of tris(2-aminoethyl) amine with 2, 6-diformylpyridine, and then by transmetallation reactions of the calcium cryptate [CaL] (NO3)2·2H2O with corresponding lanthanide ions; three lanthanide cryptates [ LnL] (NO)3·3H2O (Ln = Eu, Gd, Tb) were synthesized and characterized by physical methods. The crystal structure of the terbium cryptate [TbL] (NO)3·3H2O was studied by X-ray analysis. The central atom was coordinated by three pyridyl and six imino nitrogen atoms and exhibited a distorted tricapped trigonal prismatic coordination geometry.展开更多
The mononuclear cryptate [Eu(H 3L F)(NO 3)(H 2O)](NO 3) 2 and the heterodinuclear cryptate [EuZnL F(DMF)](ClO 4) 2 were synthesized and characterized. The triplet state energy of the cryptand (H 3L F) was ...The mononuclear cryptate [Eu(H 3L F)(NO 3)(H 2O)](NO 3) 2 and the heterodinuclear cryptate [EuZnL F(DMF)](ClO 4) 2 were synthesized and characterized. The triplet state energy of the cryptand (H 3L F) was studied by phosphorescence spectrum. The fluorescent properties of Eu(Ⅲ) cryptates in MeOH solution show that the cryptand (H 3L F) can sensitize the Eu(Ⅲ) ion to luminescence and the introduction of the Zn(Ⅱ) ion into the mononuclear Eu(Ⅲ) cryptate resulted in blue shift of three ligand centered bands, increase of molar absorption coefficient and increase of the luminescence intensity of Eu(Ⅲ).展开更多
A new mononuclear cadmium(Ⅱ) cryptate has been synthesized by [2+3] Schiff base condensation of tri(2-aminoethyl)amine with glyoxal in the presence of Cd(ClO4)2·6H2O. The crystal structure, spectral chara...A new mononuclear cadmium(Ⅱ) cryptate has been synthesized by [2+3] Schiff base condensation of tri(2-aminoethyl)amine with glyoxal in the presence of Cd(ClO4)2·6H2O. The crystal structure, spectral characterization and molar conductivity show that cadmium(Ⅱ) is sixcoordinated (N6) into a distorted octahedral geometry.展开更多
The metal complexes of polyaza cryptand have attracted much attentionowing to their special structure, unusual photo-chemical, electrical and catalyticproperties. Recently, Lehn and Nelson synthesized successively a s...The metal complexes of polyaza cryptand have attracted much attentionowing to their special structure, unusual photo-chemical, electrical and catalyticproperties. Recently, Lehn and Nelson synthesized successively a series ofcryptands and crypatates with high yield by (2+3) schiff-base condensation of tris(2-aminoethyl)amine and aryl dialdehyde. But so far, little work about the analogueswith larger cavities and flexible chains condensed by tris (3-aminopropyl) amine (abbr.展开更多
The enantiomers of carboline-based cryptates were successfully resolved by chiral HPLC.These complexes show high configurational stability under harsh conditions and their absolute configuration was determined by comp...The enantiomers of carboline-based cryptates were successfully resolved by chiral HPLC.These complexes show high configurational stability under harsh conditions and their absolute configuration was determined by comparing theoretical and expe rimental electronic circular dichroism spectra.The e nantiopure cryptates exhibit strong circularly polarized luminescence with a maximum dissymmetry factor glum=0.25 for the f-f transition 5 D0→7 F1(λ=594 nm)under visible light excitation atλgx=400 nm.展开更多
基金Project supported by the National Natural Science Foundation of China (20671075)the Natural Science Foundation of Hubei Province (2005ABA021)China Postdoctoral Science Foundation (20060390858)
文摘New alkaline earth metal cryptates [ML](NO3)2 ·2H2O (M=Ca^2+, Sr^2+, Ba^2+; L = 1, 4,12,15,18, 26, 31, 39, 42, 43, 44-undecaazapentacyclo- [ 13.13.13.1^6,10 .1^20,24 .1^33,37 ]-tetratetraconta -4, 6, 8, 10(44), 11, 18, 20, 22, 24(43), 25, 31, 33, 35, 37(42), 38-pentadecaene) were synthesized by [2 + 3 ] template condensation of tris(2-aminoethyl) amine with 2, 6-diformylpyridine, and then by transmetallation reactions of the calcium cryptate [CaL] (NO3)2·2H2O with corresponding lanthanide ions; three lanthanide cryptates [ LnL] (NO)3·3H2O (Ln = Eu, Gd, Tb) were synthesized and characterized by physical methods. The crystal structure of the terbium cryptate [TbL] (NO)3·3H2O was studied by X-ray analysis. The central atom was coordinated by three pyridyl and six imino nitrogen atoms and exhibited a distorted tricapped trigonal prismatic coordination geometry.
文摘The mononuclear cryptate [Eu(H 3L F)(NO 3)(H 2O)](NO 3) 2 and the heterodinuclear cryptate [EuZnL F(DMF)](ClO 4) 2 were synthesized and characterized. The triplet state energy of the cryptand (H 3L F) was studied by phosphorescence spectrum. The fluorescent properties of Eu(Ⅲ) cryptates in MeOH solution show that the cryptand (H 3L F) can sensitize the Eu(Ⅲ) ion to luminescence and the introduction of the Zn(Ⅱ) ion into the mononuclear Eu(Ⅲ) cryptate resulted in blue shift of three ligand centered bands, increase of molar absorption coefficient and increase of the luminescence intensity of Eu(Ⅲ).
文摘New lanthanide cryptates [LnL](ClO_4)_3 (Ln=Eu 3+, Ce 3+, Pr 3+, Sm 3+, Gd 3+, Tb 3+; L=1, 4, 12, 15, 18, 26, 31, 39, 42, 43, 44-undecaazapentacyclo-[13.13.13.1 6, 10.1 20, 24.1 33, 37]-tetratetraconta-4, 6, 8, 10(44), 11, 18, 20, 22, 24(43), 25, 31, 33, 35, 37(42), 38-penta decaene) were synthesized by transmetalation reaction of lanthanide perchlorates with its barium cryptate which was obtained by [2+3] template condensation of tren with 2,6-diformylpyridine in the presence of barium perchlorate, and characterized by elemental analysis, IR and electrospray mass spectrum.
基金This project was supported by the National Natural Science Foundation of China (No. 50372028) and the Foundation of hhit Marine-Technology lab
文摘A new mononuclear cadmium(Ⅱ) cryptate has been synthesized by [2+3] Schiff base condensation of tri(2-aminoethyl)amine with glyoxal in the presence of Cd(ClO4)2·6H2O. The crystal structure, spectral characterization and molar conductivity show that cadmium(Ⅱ) is sixcoordinated (N6) into a distorted octahedral geometry.
基金Project supported by the National Natural Science Foundation of China and Fuzhou State Key Laboratory of Structural Chemistry.
文摘The metal complexes of polyaza cryptand have attracted much attentionowing to their special structure, unusual photo-chemical, electrical and catalyticproperties. Recently, Lehn and Nelson synthesized successively a series ofcryptands and crypatates with high yield by (2+3) schiff-base condensation of tris(2-aminoethyl)amine and aryl dialdehyde. But so far, little work about the analogueswith larger cavities and flexible chains condensed by tris (3-aminopropyl) amine (abbr.
基金Project supported by the German Research Foundation(DFG,research grant SE1448/7-1 for M.S.)German Academic Scholarship Foundation(Studienstiftung des deutsches Volkes,predoctoral fellowship for E.K.)。
文摘The enantiomers of carboline-based cryptates were successfully resolved by chiral HPLC.These complexes show high configurational stability under harsh conditions and their absolute configuration was determined by comparing theoretical and expe rimental electronic circular dichroism spectra.The e nantiopure cryptates exhibit strong circularly polarized luminescence with a maximum dissymmetry factor glum=0.25 for the f-f transition 5 D0→7 F1(λ=594 nm)under visible light excitation atλgx=400 nm.