Five new mixed ligand complexes Cu(X PTLA)phe[PTLA=2 (COO)C6H4CONHC6H4,X=H,2 Cl,2 CH3,2 OCH3,4 OCH2CH3,Phe=β phenylalanine] were synthesized and characterized by means of elemental analysis, infrared and ultraviolet ...Five new mixed ligand complexes Cu(X PTLA)phe[PTLA=2 (COO)C6H4CONHC6H4,X=H,2 Cl,2 CH3,2 OCH3,4 OCH2CH3,Phe=β phenylalanine] were synthesized and characterized by means of elemental analysis, infrared and ultraviolet as well as thermogravimetical analysis. It is indicated that in mixed ligand complexes coordination occurs through carboxylate oxygen, oxygen of amino in 2 [(substituted phenylamino) carbonyl] benzoic acid and carboxyl oxygen, nitrogen of amino in amino acid.Stereo configuration of the complex is plane square. Three ways,MacCllum and Tammer ,Coats and Redfern and Zsako methods, were adopted to calculate the values of the apparent decomposition activation energies, the activation entropies, the reaction orders and the frequency factors, respectively. The results show that the reaction orders are all 2/3. Studies of the mechanism of these reactions state that these reactions all fit the kinetic equation 1-(1-α)1/3=kt.The changes of activation energies and activation entropies were discussed.展开更多
The complex[Cu(L-met)(phen)(H 2 O)]NO 3 ·H 2 O has been synthesized and investigated by elemental analysis,molar conductivity,spec troscopic and X-ray diffraction methods,where phen =1,10-phenanthroline and L-met...The complex[Cu(L-met)(phen)(H 2 O)]NO 3 ·H 2 O has been synthesized and investigated by elemental analysis,molar conductivity,spec troscopic and X-ray diffraction methods,where phen =1,10-phenanthroline and L-met =L-methioninate group.The complex crystallized in the monoclinic space g roup P2 1 with a=12.053(2)*!,b=6.886(1)*!,c=13.385(3)*!,β=113.59(3)°,V=1018.1(3)*! 3 ,Z =2,D c =1.598g·cm -3 ,μ=1.223mm -1 ,F(000)=506,R 1 =0.0306,and w R 2 =0.0742.The copper*"atom is ligated in a distorted square-pyramidal geometry by two ni trogen atoms of one phen and the amino nitrogen atom ,one carboxylate oxygen atom of L-met in the base plane,and an aqua at t he apical position.A one-dimension al chain configuration formed by the hydrogen-bonding and weak Cu-O(the uncoordinated carboxyl oxygen a tom)coordination interactions be-tween neighboring[Cu(L-met)(phen)(H 2 O)] + cations.CCDC:183368.展开更多
Two-dimensional network Cu(Ⅱ) compound [Cu(HGS).H2O].H2O was synthesized and characterized by elemental analysis,IR spectrum,where GS is the schiff base N-N-3-carboxy salicylidene glycine.Its crystal structrue was de...Two-dimensional network Cu(Ⅱ) compound [Cu(HGS).H2O].H2O was synthesized and characterized by elemental analysis,IR spectrum,where GS is the schiff base N-N-3-carboxy salicylidene glycine.Its crystal structrue was determined by single crystal X-ray diffraction techniques.Crystal data are as fullows: monoclinic,space group a=0.84846(3) nm,b=0.68154(3)nm,c=1.96716(8)nm,α=90°,β=95.8210(10°),γ=90°,Z=4,Dc=1.883Mg/m3,Mr=320.74,μ=1.961,F(000)=652,R=0.0279,wR2=0.0722.The copper atom is five-coordinated in a distorted square pyramidal,by one N donor,two oxygen donors,and an exogenous water forming the bottom of the square-pyramidal,with an O atom of the adjacent molecule occupying the apical site.Crystal structure indicated that the complex has two-dimensional stacking network structrue,which is formed by intramolecular hydrogen bonds,intermolecular hydrogen bonds and stacking effect of aromatic ring.展开更多
The novel complexes n(ClO 4) n (MIMHA=N-[(1-methylimidazole-2-yl)methyl]-β-alanine)were prepared and characterized by Single-crystal X-ray analysis.Crystal data:monoclinic,Space group C2/c,a=24.68(2),b=7.601(3),c=14....The novel complexes n(ClO 4) n (MIMHA=N-[(1-methylimidazole-2-yl)methyl]-β-alanine)were prepared and characterized by Single-crystal X-ray analysis.Crystal data:monoclinic,Space group C2/c,a=24.68(2),b=7.601(3),c=14.137(10)*!,β=102.8(1),V=2586(3)*! 3,Z=8. The copper(Ⅱ) atoms has a planae-square (N 2O 2) geometry,which positions are occupied by two nitrogen atoms and one oxygen atom from the Schiff base ligand and the other carboxy oxygen atom from the adjacent ligand.The carboxylate groups acted in the bidentate syn-anti mode and bridges each pair of adjacent copper(Ⅱ) atoms( d Cu...Cu Ca 4.8*!) via the two equatorial positions,giving rise to one-dimensional (Cu-O-C-O-Cu) n skeletons.展开更多
A novel method for enzymatic synthesis of L-theanine using copper(Ⅱ)-L-glutamine[Cu(Gln)2]as donor substrate was proposed.The structure of Cu(Gln)2 was identified by infrared spectrum analysis and its stability was a...A novel method for enzymatic synthesis of L-theanine using copper(Ⅱ)-L-glutamine[Cu(Gln)2]as donor substrate was proposed.The structure of Cu(Gln)2 was identified by infrared spectrum analysis and its stability was also investigated under the reaction conditions.The enzymatic synthesis of L-theanine catalyzed by γ-glutamyltranspeptidase was carried out by using Cu(Gln)2 and L-glutamine as donor substrate respectively,and the product yield and conversion rate of donor substrate were compared under the conditions of different ratios of donor and acceptor.The results showed that the transpeptidation reaction could be effectively enhanced by using Cu(Gln)2 as donor substrate.The conversion rate of donor would increase by 51.5%,44.9% and 27.1% under different reaction conditions,compared to that using L-Gln as donor substrate.When the molar ratio of donor to acceptor was 6∶100,a higher donor conversion of 71.3% was obtained.展开更多
文摘Five new mixed ligand complexes Cu(X PTLA)phe[PTLA=2 (COO)C6H4CONHC6H4,X=H,2 Cl,2 CH3,2 OCH3,4 OCH2CH3,Phe=β phenylalanine] were synthesized and characterized by means of elemental analysis, infrared and ultraviolet as well as thermogravimetical analysis. It is indicated that in mixed ligand complexes coordination occurs through carboxylate oxygen, oxygen of amino in 2 [(substituted phenylamino) carbonyl] benzoic acid and carboxyl oxygen, nitrogen of amino in amino acid.Stereo configuration of the complex is plane square. Three ways,MacCllum and Tammer ,Coats and Redfern and Zsako methods, were adopted to calculate the values of the apparent decomposition activation energies, the activation entropies, the reaction orders and the frequency factors, respectively. The results show that the reaction orders are all 2/3. Studies of the mechanism of these reactions state that these reactions all fit the kinetic equation 1-(1-α)1/3=kt.The changes of activation energies and activation entropies were discussed.
文摘The complex[Cu(L-met)(phen)(H 2 O)]NO 3 ·H 2 O has been synthesized and investigated by elemental analysis,molar conductivity,spec troscopic and X-ray diffraction methods,where phen =1,10-phenanthroline and L-met =L-methioninate group.The complex crystallized in the monoclinic space g roup P2 1 with a=12.053(2)*!,b=6.886(1)*!,c=13.385(3)*!,β=113.59(3)°,V=1018.1(3)*! 3 ,Z =2,D c =1.598g·cm -3 ,μ=1.223mm -1 ,F(000)=506,R 1 =0.0306,and w R 2 =0.0742.The copper*"atom is ligated in a distorted square-pyramidal geometry by two ni trogen atoms of one phen and the amino nitrogen atom ,one carboxylate oxygen atom of L-met in the base plane,and an aqua at t he apical position.A one-dimension al chain configuration formed by the hydrogen-bonding and weak Cu-O(the uncoordinated carboxyl oxygen a tom)coordination interactions be-tween neighboring[Cu(L-met)(phen)(H 2 O)] + cations.CCDC:183368.
文摘Two-dimensional network Cu(Ⅱ) compound [Cu(HGS).H2O].H2O was synthesized and characterized by elemental analysis,IR spectrum,where GS is the schiff base N-N-3-carboxy salicylidene glycine.Its crystal structrue was determined by single crystal X-ray diffraction techniques.Crystal data are as fullows: monoclinic,space group a=0.84846(3) nm,b=0.68154(3)nm,c=1.96716(8)nm,α=90°,β=95.8210(10°),γ=90°,Z=4,Dc=1.883Mg/m3,Mr=320.74,μ=1.961,F(000)=652,R=0.0279,wR2=0.0722.The copper atom is five-coordinated in a distorted square pyramidal,by one N donor,two oxygen donors,and an exogenous water forming the bottom of the square-pyramidal,with an O atom of the adjacent molecule occupying the apical site.Crystal structure indicated that the complex has two-dimensional stacking network structrue,which is formed by intramolecular hydrogen bonds,intermolecular hydrogen bonds and stacking effect of aromatic ring.
文摘The novel complexes n(ClO 4) n (MIMHA=N-[(1-methylimidazole-2-yl)methyl]-β-alanine)were prepared and characterized by Single-crystal X-ray analysis.Crystal data:monoclinic,Space group C2/c,a=24.68(2),b=7.601(3),c=14.137(10)*!,β=102.8(1),V=2586(3)*! 3,Z=8. The copper(Ⅱ) atoms has a planae-square (N 2O 2) geometry,which positions are occupied by two nitrogen atoms and one oxygen atom from the Schiff base ligand and the other carboxy oxygen atom from the adjacent ligand.The carboxylate groups acted in the bidentate syn-anti mode and bridges each pair of adjacent copper(Ⅱ) atoms( d Cu...Cu Ca 4.8*!) via the two equatorial positions,giving rise to one-dimensional (Cu-O-C-O-Cu) n skeletons.
文摘A novel method for enzymatic synthesis of L-theanine using copper(Ⅱ)-L-glutamine[Cu(Gln)2]as donor substrate was proposed.The structure of Cu(Gln)2 was identified by infrared spectrum analysis and its stability was also investigated under the reaction conditions.The enzymatic synthesis of L-theanine catalyzed by γ-glutamyltranspeptidase was carried out by using Cu(Gln)2 and L-glutamine as donor substrate respectively,and the product yield and conversion rate of donor substrate were compared under the conditions of different ratios of donor and acceptor.The results showed that the transpeptidation reaction could be effectively enhanced by using Cu(Gln)2 as donor substrate.The conversion rate of donor would increase by 51.5%,44.9% and 27.1% under different reaction conditions,compared to that using L-Gln as donor substrate.When the molar ratio of donor to acceptor was 6∶100,a higher donor conversion of 71.3% was obtained.
