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
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
Two novel complexes [Cu（TATP）（L-Leu）（H2O）]NO3·H2O and [Cu（TATP）L-Met)（H2O）]NO3·0.5H2O（TATP=1,4,8,9-tetraazatriphenylene,L-Leu=L-Leucinate,L-Met=L-Methioninate）were synthesized and characterized b...Two novel complexes [Cu（TATP）（L-Leu）（H2O）]NO3·H2O and [Cu（TATP）L-Met)（H2O）]NO3·0.5H2O（TATP=1,4,8,9-tetraazatriphenylene,L-Leu=L-Leucinate,L-Met=L-Methioninate）were synthesized and characterized by elemental analysis,molar conductivity,infrared absorption spectrum,electronic absorption spectrum and DTA-TGA.The results showed that both of the complexes had a distorted square-pyramidal geometry with two nitrogen atoms of TATP and one amino nitrogen and one carboxylate oxygen atoms of L-Leu/L-Met at the equatorial positions,and one water oxygen at the axial position.The SOD-Like activity of the complexes was determined by NBT-illumination method.The result indicated that the complexes possessed excellent SOD-like activity and showed 50% inhibition ration in the concentration of 0.355 μmol·L-1 and 0.185 μmol·L-1,respectively.The greater SOD-like activity of the complex[Cu（TATP）（L-Leu）（H2O）]NO3·H2O may be attributed to the smaller spatial hindrance of the side-chain group of L-Met.展开更多
The complex,[Cu2(L-ala)2(phen)2]n·2nClO4·2nH2O(L-ala=L-alaninate,phen=1,10-phenanthroline)has been synthesized and investigated by elemental analysis,IR spectroscopy,and X-ray diffraction methods.The complex...The complex,[Cu2(L-ala)2(phen)2]n·2nClO4·2nH2O(L-ala=L-alaninate,phen=1,10-phenanthroline)has been synthesized and investigated by elemental analysis,IR spectroscopy,and X-ray diffraction methods.The complex crystallizes in the monoclinic space group P21 with a=1.161 1(4)nm,b=0.717 2(2)nm,c=2.074 1(7)nm,β=101.028(6)°,V=1.695 4(9)nm3,Dc=1.760 g·cm-3,Z=4,μ=1.493 mm-1,F(000)=916,R=0.052 2,wR=0.127 9 for 7 131 unique reflections.The cations of [Cu2(L-ala)2(phen)2]n2n+ have an one-dimensional polymeric structure,due to the bridging of two Cu(phen)2+ units by a carboxylate group of L-alaninate,and each Cu(Ⅱ)ion is in a slightly distorted square-pyramidal coordination geometry,with the phen(N,N’)and the L-ala(N,O)acting as bidentate ligands in the equatorial plane and another carboxylate oxygen atom from a symmetry-related neighboring L-alaninate ion in the apical position.CCDC:277541.展开更多
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.
文摘Two novel complexes [Cu（TATP）（L-Leu）（H2O）]NO3·H2O and [Cu（TATP）L-Met)（H2O）]NO3·0.5H2O（TATP=1,4,8,9-tetraazatriphenylene,L-Leu=L-Leucinate,L-Met=L-Methioninate）were synthesized and characterized by elemental analysis,molar conductivity,infrared absorption spectrum,electronic absorption spectrum and DTA-TGA.The results showed that both of the complexes had a distorted square-pyramidal geometry with two nitrogen atoms of TATP and one amino nitrogen and one carboxylate oxygen atoms of L-Leu/L-Met at the equatorial positions,and one water oxygen at the axial position.The SOD-Like activity of the complexes was determined by NBT-illumination method.The result indicated that the complexes possessed excellent SOD-like activity and showed 50% inhibition ration in the concentration of 0.355 μmol·L-1 and 0.185 μmol·L-1,respectively.The greater SOD-like activity of the complex[Cu（TATP）（L-Leu）（H2O）]NO3·H2O may be attributed to the smaller spatial hindrance of the side-chain group of L-Met.
文摘The complex,[Cu2(L-ala)2(phen)2]n·2nClO4·2nH2O(L-ala=L-alaninate,phen=1,10-phenanthroline)has been synthesized and investigated by elemental analysis,IR spectroscopy,and X-ray diffraction methods.The complex crystallizes in the monoclinic space group P21 with a=1.161 1(4)nm,b=0.717 2(2)nm,c=2.074 1(7)nm,β=101.028(6)°,V=1.695 4(9)nm3,Dc=1.760 g·cm-3,Z=4,μ=1.493 mm-1,F(000)=916,R=0.052 2,wR=0.127 9 for 7 131 unique reflections.The cations of [Cu2(L-ala)2(phen)2]n2n+ have an one-dimensional polymeric structure,due to the bridging of two Cu(phen)2+ units by a carboxylate group of L-alaninate,and each Cu(Ⅱ)ion is in a slightly distorted square-pyramidal coordination geometry,with the phen(N,N’)and the L-ala(N,O)acting as bidentate ligands in the equatorial plane and another carboxylate oxygen atom from a symmetry-related neighboring L-alaninate ion in the apical position.CCDC:277541.
