A novel Pd(II) Benzo-15-crown-5 complex [Na(B15CS)]_2[Pd(SCN)_4] has been isolated and characterized by IR and X-ray diffraction analysis. The crystal structure belongs to monoclinic, space group P2_1,/n with cell dim...A novel Pd(II) Benzo-15-crown-5 complex [Na(B15CS)]_2[Pd(SCN)_4] has been isolated and characterized by IR and X-ray diffraction analysis. The crystal structure belongs to monoclinic, space group P2_1,/n with cell dimensions, a = l.0164(6), b = l.3743(3), c = l.4987(7) nm, β = 95.248(6) °, V = 2.0847 'nm_3, Z = 2, F(000) = 944, R = 0.053, Rw = 0.072. The compound consists of two [Na(B15CS)]+ complex canons and a [Pd(SCN)4_]^(2-) complex anion. Each sodium ion is coordinated by five crown ether oxygen atoms and one N atom from the SCN group of [Pd(SCN)_4]^(2-) to form stable neutral complex.展开更多
The oxygenation constants （Ko2） of cobalt（Ⅱ） hydroxamates （CoL^1 2-CoL^3 2） with benzo-15-crown-5 （B15C5） pendants were measured over the range of -5 to ＋20 ℃, and the values of thermodynamic parameters （...The oxygenation constants （Ko2） of cobalt（Ⅱ） hydroxamates （CoL^1 2-CoL^3 2） with benzo-15-crown-5 （B15C5） pendants were measured over the range of -5 to ＋20 ℃, and the values of thermodynamic parameters （ΔH^0 and ΔS^0） were calculated based on these （Ko2） values, Meanwhile, these crowned complexes were employed to the oxidation for p-xylene to p-toluic acid with air at 110Δ under normal atmospheric pressure. The effects of B15C5 pendant and the length of chain bonded to B15C5 in these complexes on the O2-binding capabilities and oxidation for p-xylene were investigated with the comparison of crown-free analogues CoL^4 2.展开更多
The single crystal of the complex [Sc(NO_3)_3(H_2O)_2]·(15C5) has been prepared in acetonitrile.The new complex has been characterized by elemental analysis,IR spectra,solubility and molar conductance measurement...The single crystal of the complex [Sc(NO_3)_3(H_2O)_2]·(15C5) has been prepared in acetonitrile.The new complex has been characterized by elemental analysis,IR spectra,solubility and molar conductance measurements.The structure of the complex is determined by single crystal X-ray diffraction analysis.展开更多
Three new solid complexes of macrocyclic polyether ligand 2, 2'-dinitro-4, 5, 4', 5'bis-(15- crown-5)-dihenzo disulfide(L) with trivalent rare earth nitrates having composition of RE(NO_3)_3·L ·6...Three new solid complexes of macrocyclic polyether ligand 2, 2'-dinitro-4, 5, 4', 5'bis-(15- crown-5)-dihenzo disulfide(L) with trivalent rare earth nitrates having composition of RE(NO_3)_3·L ·6H_2O(RE=Ce, Pr, Nd) have been synthesized in acetonitrile. All the isolated complexes have been characterized by elementary analysis, IR and UV spectra, differential thermal and thermogravimetric analysis, X-ray powder diffraction analysis, molar conductance and measurements of solubility in some general solvents.展开更多
Calix[4]-crown-5-sulfonyl cyclothiourea derivatives 6 and 7 were synthesized from calix[4]-crown-5-monosulfonylethylenediamine derivatives 4 and 5 and carbon disulfide through nucleophilic addition and subsequent cycl...Calix[4]-crown-5-sulfonyl cyclothiourea derivatives 6 and 7 were synthesized from calix[4]-crown-5-monosulfonylethylenediamine derivatives 4 and 5 and carbon disulfide through nucleophilic addition and subsequent cyclization of intramolecule at room temperature in aqueous solution. The advantages of the novel protocol are the mild reaction condition, free organic solvent, simple final treatment, easy isolation of products and excellent yields.展开更多
[Na (N- (p-chlorophenyl ) aza-15--crown--5 ) (Et2O )]2 (Na2W0.5 Mo7.5 O26), Mr= 2119. 4, monoclinic, space group P21/c, a= 17. 803(4), b= 13. 674 (3), c= 14. 610(3), β= 112. 33(3)°, V=3290(1) A3, Z= 2, Dc= 2. 13...[Na (N- (p-chlorophenyl ) aza-15--crown--5 ) (Et2O )]2 (Na2W0.5 Mo7.5 O26), Mr= 2119. 4, monoclinic, space group P21/c, a= 17. 803(4), b= 13. 674 (3), c= 14. 610(3), β= 112. 33(3)°, V=3290(1) A3, Z= 2, Dc= 2. 139 g/cm3, μ= 1.704 mm-1, F (000) = 2079, R = 0. 026, Rw= 0. 030. The supermolecular complexconsists of one [Na2W0.5Mo7.5O28)2- anion in which only two Mo atoms are replaced byW in 25% (M= l/4W+3/4Mo) and the two Na+ are linked symmetrically to neighbouring [W0.5Mo7.5O26]4- units on the right and the left respectively and two complexcanons in which each Na+ deviates from the plane of the four ether oxygens and is coordinated to every hetero--atom in the crownether ring, and is also coordinated to the Oatom of Et2O.展开更多
The macrocyclic ligand,15-crown-5,was used as an ionophore for fabrication of a polyvinyl chloride（PVC） based membrane sensor for Ag（Ⅰ） cation.For construction of the Ag（Ⅰ） cation selective electrode the best ...The macrocyclic ligand,15-crown-5,was used as an ionophore for fabrication of a polyvinyl chloride（PVC） based membrane sensor for Ag（Ⅰ） cation.For construction of the Ag（Ⅰ） cation selective electrode the best response characteristics were obtained using the composition： 15-crown-5/PVC/o-nitrophenyloctylether（NPOE）/sodium tetraphenyl borate（NaTPB） in the percentage ratio of 5.6/30/60.5/3.9（w/w/w/w）.The electrochemical sensor shows a linear dynamic range 1.0 10 7–1.0 10 1mol/L and a Nernstian slope of 58.9 0.5 mV/decade with a detection limit of 8.09 10 8mol/L for Ag（Ⅰ） cation.It has a fast response time of 〈10 s and can be used for at least 8 weeks without any considerable divergences in its potential response.It was successfully used as an indicator electrode in potentiometric titration of Ag（Ⅰ）cation with I and Cl anions and also for the determination of this metal cation in radiology waste water.展开更多
Novel unsymmetrical bissalicylaldimine bis-Schiff bases with a benzo-10-aza-15-crown-5 pendant and their cobalt complexes have been synthesized via condensation of 3 or 5-[（benzo-10-aza-15-crown-5）-10-ylmethyl] sali...Novel unsymmetrical bissalicylaldimine bis-Schiff bases with a benzo-10-aza-15-crown-5 pendant and their cobalt complexes have been synthesized via condensation of 3 or 5-[（benzo-10-aza-15-crown-5）-10-ylmethyl] salicylaldehyde with the half unit Schiff bases and characterized by ^1H NMR, IR, mass spectroscopy, elemental analysis, molar conductances and molar magnetic susceptibility.展开更多
A novel crown ether, 2,3-naphtho-10-aza-15-crown-5 (NAC) was synthesized.This compound does not show strong fluorescence and phosphorescence due to photoinducedintramolecular electron transfer from the nitrogen lone p...A novel crown ether, 2,3-naphtho-10-aza-15-crown-5 (NAC) was synthesized.This compound does not show strong fluorescence and phosphorescence due to photoinducedintramolecular electron transfer from the nitrogen lone pair of electrons to the singlet excitedstate of the naphthalene chromophore. Complexation with heavy-metal ions results in the quenching ofthe fluorescence and enhancement of the phosphorescence significantly. These observations wereinterpreted in terms of the binding interactions, between the nitrogen lone pair electrons and themetal cation, which prevent photoinduced intramolecular electron transfer, and the heavy-atomeffects which induce quenching of the fluorescence and enhancement of the phosphorescence. Theseazacrown and heavy-metal-based systems could be useful as potential chemical sensors and molecularphotonic devices.展开更多
This paper illustrates the origination, preparation, electron configuration, crystal structure, and properties of copper(Ⅱ) 15 crown 5 coordination compound with 3d z 2 ground state. The characteristics of el...This paper illustrates the origination, preparation, electron configuration, crystal structure, and properties of copper(Ⅱ) 15 crown 5 coordination compound with 3d z 2 ground state. The characteristics of electron paramagnetic resonance(EPR) spectrum, d d transition in electron spectrum and differential thermal analysis (DTA) of the compound are shown. The future development in biochemistry and material science is discussed.展开更多
Two kinds of novel styryl chemosensory 2-FMNC and 3-FMNC, were designed and synthesized by an apporiate introduction of 9-benzylidene-9H-fluorene group as fluorophore with the aim at avoiding photoisomerisation. These...Two kinds of novel styryl chemosensory 2-FMNC and 3-FMNC, were designed and synthesized by an apporiate introduction of 9-benzylidene-9H-fluorene group as fluorophore with the aim at avoiding photoisomerisation. These 9-benzylidene-9H-fluorene derivatives showed the similar selectivity and sensitivity upon addition of metal ions. The sensitivity of FMNC to alkaline earth metal ions was Ba2＋〉 Sr2＋〉Ca2＋≈Mg2＋.展开更多
Two novel benzo 15 crown 5 derivatives containing thiocycle(3) and selenacycle(4) have been synthesized in the presence of Na 2S·9H 2O or Na 2Se 2 and characterized by elemental analysis and mass, IR, UV and 1H N...Two novel benzo 15 crown 5 derivatives containing thiocycle(3) and selenacycle(4) have been synthesized in the presence of Na 2S·9H 2O or Na 2Se 2 and characterized by elemental analysis and mass, IR, UV and 1H NMR spectroscopy. The cation binding abilities and selectivities of parent benzo 15 crown 5(1) and its derivatives 3 and 4 with alkali and heavy metal ions have been evaluated by solvent extraction of aqueous metal picrates. The results obtained indicated that novel selera 3 cyclopentene[3,4 d]benzo 15 crown 5(4) showed moderate extractability and selectivity for Ag + over any other alkali and heavy metal ions. [WT5HZ]展开更多
文摘A novel Pd(II) Benzo-15-crown-5 complex [Na(B15CS)]_2[Pd(SCN)_4] has been isolated and characterized by IR and X-ray diffraction analysis. The crystal structure belongs to monoclinic, space group P2_1,/n with cell dimensions, a = l.0164(6), b = l.3743(3), c = l.4987(7) nm, β = 95.248(6) °, V = 2.0847 'nm_3, Z = 2, F(000) = 944, R = 0.053, Rw = 0.072. The compound consists of two [Na(B15CS)]+ complex canons and a [Pd(SCN)4_]^(2-) complex anion. Each sodium ion is coordinated by five crown ether oxygen atoms and one N atom from the SCN group of [Pd(SCN)_4]^(2-) to form stable neutral complex.
基金The authors gratefully acknowledge the grants from the National Natural Science Foundation of China(No.20072025)Education 0ffice Foundation of Sichuan Province(No.2005C012)Sichuan Provincial Department of Science&Technology(No.2006J13-143)in support of this work.
文摘The oxygenation constants （Ko2） of cobalt（Ⅱ） hydroxamates （CoL^1 2-CoL^3 2） with benzo-15-crown-5 （B15C5） pendants were measured over the range of -5 to ＋20 ℃, and the values of thermodynamic parameters （ΔH^0 and ΔS^0） were calculated based on these （Ko2） values, Meanwhile, these crowned complexes were employed to the oxidation for p-xylene to p-toluic acid with air at 110Δ under normal atmospheric pressure. The effects of B15C5 pendant and the length of chain bonded to B15C5 in these complexes on the O2-binding capabilities and oxidation for p-xylene were investigated with the comparison of crown-free analogues CoL^4 2.
文摘The single crystal of the complex [Sc(NO_3)_3(H_2O)_2]·(15C5) has been prepared in acetonitrile.The new complex has been characterized by elemental analysis,IR spectra,solubility and molar conductance measurements.The structure of the complex is determined by single crystal X-ray diffraction analysis.
基金the National Natural Science Foundation of China (No. 20371040) the Foundation (031-A21-004)of Gansu province and the Foundation (No. 02-18) of Northwest Normal University.
文摘Three new solid complexes of macrocyclic polyether ligand 2, 2'-dinitro-4, 5, 4', 5'bis-(15- crown-5)-dihenzo disulfide(L) with trivalent rare earth nitrates having composition of RE(NO_3)_3·L ·6H_2O(RE=Ce, Pr, Nd) have been synthesized in acetonitrile. All the isolated complexes have been characterized by elementary analysis, IR and UV spectra, differential thermal and thermogravimetric analysis, X-ray powder diffraction analysis, molar conductance and measurements of solubility in some general solvents.
基金Financial support from the National Natural Science Foundation of China(No.20802049) and Program for New Century Excellent Talents in University of Tianjin City
文摘Calix[4]-crown-5-sulfonyl cyclothiourea derivatives 6 and 7 were synthesized from calix[4]-crown-5-monosulfonylethylenediamine derivatives 4 and 5 and carbon disulfide through nucleophilic addition and subsequent cyclization of intramolecule at room temperature in aqueous solution. The advantages of the novel protocol are the mild reaction condition, free organic solvent, simple final treatment, easy isolation of products and excellent yields.
文摘[Na (N- (p-chlorophenyl ) aza-15--crown--5 ) (Et2O )]2 (Na2W0.5 Mo7.5 O26), Mr= 2119. 4, monoclinic, space group P21/c, a= 17. 803(4), b= 13. 674 (3), c= 14. 610(3), β= 112. 33(3)°, V=3290(1) A3, Z= 2, Dc= 2. 139 g/cm3, μ= 1.704 mm-1, F (000) = 2079, R = 0. 026, Rw= 0. 030. The supermolecular complexconsists of one [Na2W0.5Mo7.5O28)2- anion in which only two Mo atoms are replaced byW in 25% (M= l/4W+3/4Mo) and the two Na+ are linked symmetrically to neighbouring [W0.5Mo7.5O26]4- units on the right and the left respectively and two complexcanons in which each Na+ deviates from the plane of the four ether oxygens and is coordinated to every hetero--atom in the crownether ring, and is also coordinated to the Oatom of Et2O.
基金the National Natural Science Foundation of China (No. 20371040) the Foundation (031-A21-004)of Gansu province and the Foundation (No. 02-18) of Northwest Normal University.
文摘The macrocyclic ligand,15-crown-5,was used as an ionophore for fabrication of a polyvinyl chloride（PVC） based membrane sensor for Ag（Ⅰ） cation.For construction of the Ag（Ⅰ） cation selective electrode the best response characteristics were obtained using the composition： 15-crown-5/PVC/o-nitrophenyloctylether（NPOE）/sodium tetraphenyl borate（NaTPB） in the percentage ratio of 5.6/30/60.5/3.9（w/w/w/w）.The electrochemical sensor shows a linear dynamic range 1.0 10 7–1.0 10 1mol/L and a Nernstian slope of 58.9 0.5 mV/decade with a detection limit of 8.09 10 8mol/L for Ag（Ⅰ） cation.It has a fast response time of 〈10 s and can be used for at least 8 weeks without any considerable divergences in its potential response.It was successfully used as an indicator electrode in potentiometric titration of Ag（Ⅰ）cation with I and Cl anions and also for the determination of this metal cation in radiology waste water.
基金Prgject supported by the National Natural Science Foundation of China （No. 29572059, and Key Project of Sichuan Province Education 0ffice （No. 2005D007）.
文摘Novel unsymmetrical bissalicylaldimine bis-Schiff bases with a benzo-10-aza-15-crown-5 pendant and their cobalt complexes have been synthesized via condensation of 3 or 5-[（benzo-10-aza-15-crown-5）-10-ylmethyl] salicylaldehyde with the half unit Schiff bases and characterized by ^1H NMR, IR, mass spectroscopy, elemental analysis, molar conductances and molar magnetic susceptibility.
文摘A novel crown ether, 2,3-naphtho-10-aza-15-crown-5 (NAC) was synthesized.This compound does not show strong fluorescence and phosphorescence due to photoinducedintramolecular electron transfer from the nitrogen lone pair of electrons to the singlet excitedstate of the naphthalene chromophore. Complexation with heavy-metal ions results in the quenching ofthe fluorescence and enhancement of the phosphorescence significantly. These observations wereinterpreted in terms of the binding interactions, between the nitrogen lone pair electrons and themetal cation, which prevent photoinduced intramolecular electron transfer, and the heavy-atomeffects which induce quenching of the fluorescence and enhancement of the phosphorescence. Theseazacrown and heavy-metal-based systems could be useful as potential chemical sensors and molecularphotonic devices.
文摘This paper illustrates the origination, preparation, electron configuration, crystal structure, and properties of copper(Ⅱ) 15 crown 5 coordination compound with 3d z 2 ground state. The characteristics of electron paramagnetic resonance(EPR) spectrum, d d transition in electron spectrum and differential thermal analysis (DTA) of the compound are shown. The future development in biochemistry and material science is discussed.
文摘Two kinds of novel styryl chemosensory 2-FMNC and 3-FMNC, were designed and synthesized by an apporiate introduction of 9-benzylidene-9H-fluorene group as fluorophore with the aim at avoiding photoisomerisation. These 9-benzylidene-9H-fluorene derivatives showed the similar selectivity and sensitivity upon addition of metal ions. The sensitivity of FMNC to alkaline earth metal ions was Ba2＋〉 Sr2＋〉Ca2＋≈Mg2＋.
文摘Two novel benzo 15 crown 5 derivatives containing thiocycle(3) and selenacycle(4) have been synthesized in the presence of Na 2S·9H 2O or Na 2Se 2 and characterized by elemental analysis and mass, IR, UV and 1H NMR spectroscopy. The cation binding abilities and selectivities of parent benzo 15 crown 5(1) and its derivatives 3 and 4 with alkali and heavy metal ions have been evaluated by solvent extraction of aqueous metal picrates. The results obtained indicated that novel selera 3 cyclopentene[3,4 d]benzo 15 crown 5(4) showed moderate extractability and selectivity for Ag + over any other alkali and heavy metal ions. [WT5HZ]
