Two new ternary complexes of 1-(2-thienyl)-3-(p-phenylethynylphenyl)-1,3-propanedione(HTPP) and 1,10-phenanthroline(phen) with Sm^3+ and Dy^3+ were synthesized.The composition of the ternary complexes was ch...Two new ternary complexes of 1-(2-thienyl)-3-(p-phenylethynylphenyl)-1,3-propanedione(HTPP) and 1,10-phenanthroline(phen) with Sm^3+ and Dy^3+ were synthesized.The composition of the ternary complexes was characterized as Sm(TPP)3phen and Dy(TPP)3phen,respectively,by infrared(IR) spectra,chemical analysis,elemental analysis,and thermodynamic analysis.At room temperature,under UV light excitation,the Sm^3+ and Dy^3+ complexes exhibit characteristic emissions of the central ions.It is found that the fluorescence intensity of Sm(TPP)3phen is stronger than that of Dy(TPP)3phen.In order to explain this phenomenon,an accurate quantum chemistry calculation was carried out,and the result is in good agreement with the experiment data.展开更多
In this study,the interaction between primary amine and diketones was investigated.Three diketones with a general structure of—(CH2C(O)CH2C(O))-X-R(X is C,O or N and R is H and/or alkyl groups)were selected to react ...In this study,the interaction between primary amine and diketones was investigated.Three diketones with a general structure of—(CH2C(O)CH2C(O))-X-R(X is C,O or N and R is H and/or alkyl groups)were selected to react with primary amine in aqueous solutions.The reaction was in-situ monitored by Raman technique and the reaction products were identified by FTIR,NMR and LC-MS.It is found that the reaction products strongly depend on the structures of diketones.When X is nitrogen,the expected Schiff base or its analog can be obtained.However,Schiff base or its analog is not detected if X is C or O,instead,ion pairs or hydrolysis products are formed accordingly,suggesting critical impacts of acidity of CH2 inβ-diketone on the product formation.This study also shows that in-situ Raman is a powerful technique for reaction monitoring and structure characterization,which is useful for mechanism understanding.展开更多
Poly(arylene ether diketone)s were prepared by the aromatic nucleophilic displacement reaction of 4,4'-difluorobenzil with different bisphenols in the presence of anhydrous potassium carbonate in diphenylsulfone a...Poly(arylene ether diketone)s were prepared by the aromatic nucleophilic displacement reaction of 4,4'-difluorobenzil with different bisphenols in the presence of anhydrous potassium carbonate in diphenylsulfone at elevated temperature. The polymers obtained had inherent viscosity of 0.51 similar to 0.63 dL/g, and exhibited glass transition temperature ranging from 136 similar to 217 degrees C mainly depending on the bisphenols used in the polymer synthesis. Thermogravimetry of these polymers showed excellent thermal stability, indicating that 10% weight losses of the polymers were observed in the range above 428 degrees C and 438 degrees C in air and nitrogen, respectively. The mechanical properties of these polymers were also described and the permeability of five polymers for H-2, O-2 and N-2 was determined at 30 degrees C.展开更多
The reaction of 2-substituted imidazolinium salt with bis-Grignard reagents is reported and a new method for the synthesis of symmetric diketones from carboxylic acids and bis-Grignard reagents is provided.
1-(4-ethylphenyl)-nonane-1,3-dione(0206)is an oil-soluble liquid molecule with rod-like structure.In this study,the chelate(0206-Fe)with octahedral structure was prepared by the reaction of ferric chloride and 1,3-dik...1-(4-ethylphenyl)-nonane-1,3-dione(0206)is an oil-soluble liquid molecule with rod-like structure.In this study,the chelate(0206-Fe)with octahedral structure was prepared by the reaction of ferric chloride and 1,3-diketone.The experimental results show that when using 0206 and a mixed solution containing 60%0206-Fe and 40%0206(0206-Fe(60%))as lubricants of the steel friction pairs,superlubricity can be achieved(0.007,0.006).But their wear scar diameters(WSD)were very large(532µm,370µm),which resulted in the pressure of only 44.3 and 61.8 MPa in the contact areas of the friction pairs.When 0206-Fe(60%)was mixed with PAO6,it was found that the friction coefficient(COF)decreased with increase of 0206-Fe(60%)in the solution.When the ratio of 0206-Fe(60%)to PAO6 was 8:2(PAO6(20%)),it exhibited better comprehensive tribological properties(232.3 MPa).Subsequent studies have shown that reducing the viscosity of the base oil in the mixed solution helped to reduce COF and increased WSD.Considering the COF,contact pressure,and running-in time,it was found that the mixed lubricant(Oil3(20%))prepared by the base oil with a viscosity of 19.7 mPa·s(Oil3)and 0206-Fe(60%)exhibited the best tribological properties(0.007,161.4 MPa,3,100 s).展开更多
Achievement of steady and reliable super-low friction at the steel/steel contact interface,one of the most tribological systems applied for mechanical moving parts,is of importance for prolonging machine lifetime and ...Achievement of steady and reliable super-low friction at the steel/steel contact interface,one of the most tribological systems applied for mechanical moving parts,is of importance for prolonging machine lifetime and reducing energy consumption.Here we reported that the superlubricity performance of the steel/steel sliding interface lubricated with tiny amounts of diketone solution strongly depends on the oxygen content in surrounding environment.The increase of oxygen not only significantly shortens the initial running-in time but also further reduces the stable coefficient of friction in superlubricity stage due to the enhancement of tribochemical reactions.On the one hand,more severe oxidation wear occurring at higher oxygen content facilitates material removal of the contact interface,lowering the contact pressure and the corresponding initial friction.On the other hand,the growth of iron ions during the shear process in high oxygen environment promotes the formation of chelate which acted as an effective lubricated film chemisorbed at the steel/steel friction interface to further lower the interfacial friction.The results provide a new opportunity to further optimize the tribological performance of diketone superlubricity system,especially towards the lubrication of mechanical engineering materials.展开更多
The title compound of PhCH_3C_3HN_2 (O )C (O) (CH_2) _3C [N (CH_2 )_4 NH_2]C_3HN_2 (O)CH_3Ph (L), a new Schiff-base containing diketone, has been synthesized. Its crystal structure has been determined by X-ray diffrac...The title compound of PhCH_3C_3HN_2 (O )C (O) (CH_2) _3C [N (CH_2 )_4 NH_2]C_3HN_2 (O)CH_3Ph (L), a new Schiff-base containing diketone, has been synthesized. Its crystal structure has been determined by X-ray diffraction analysis. The crystal, C_(30)H_(41)N_6O_(5.5) (L·0. 5C_2H_5OH·2H_2O) , is triclinic, space group P1 ,a=11.544 (1) , b=11. 723(5) , c=12. 344(2) A , a=80. 61(2) . β=84. 17(1) ,γ=78. 80(2)°.V=1612. 6(9) A ̄3, M_r=1147. 40, Z=2, D_x= 1. 18 g/cm ̄3 . μ=0. 77 cm-1, F(000) = 614. The final agreement factor R=0. 079 for 1828 independent reflections with I≥ 3σ(I) considered to be observed. L contains three functional groups:β-diketone,β-ketoimine(Schiff-base) and NH_2. The β-diketone group has partially delocalized. The pyrazoline plane is not coplanar with its connected phenyl plane. The big πbond is not extended between these planes. There are one ethanol and four water molecules in the crystal. Intermolecular hydrogen bonds may exist between C=O and H_2O. NH_2 and H_2O, H_2O and EtOH, or H_2O and H_2O.展开更多
Solid state reactions between β diketones (HPMBP, HDBM) and LnAc 3· x H 2O(La,Nd: x =3/2;Tb: x =4) have been investigated at low heating temperature. Pure compounds of Ln(PMBP) 3 and Ln(DBM) 3 are obt...Solid state reactions between β diketones (HPMBP, HDBM) and LnAc 3· x H 2O(La,Nd: x =3/2;Tb: x =4) have been investigated at low heating temperature. Pure compounds of Ln(PMBP) 3 and Ln(DBM) 3 are obtained by solid state reaction, and characterized by elemental analysis, infrared radiation (IR),X ray diffraction (XRD) and photoacoustic spectra. The solid state reaction properties of β diketones and their influences on the structures of products are discussed.展开更多
A novel complex Cu(PPh3)2(acac) 1 (PPh3 = triphenylphosphine, acac = acetylacetone) was obtained by a solution reaction and structurally characterized by X-ray diffraction. The crystal belongs to monoclinic, spa...A novel complex Cu(PPh3)2(acac) 1 (PPh3 = triphenylphosphine, acac = acetylacetone) was obtained by a solution reaction and structurally characterized by X-ray diffraction. The crystal belongs to monoclinic, space group P21/n with a = 13.7361(8), b = 12.8204(7), c = 19.7638(13)A, β = 95.946(2)^o, C41H37CuO2P2, Mr= 687.19, V = 3461.7(4)A3, Z = 4, Dc = 1.319 g/cm^3, S = 1.067,μ(MoKa) = 0.758 mm^-l, F(000) = 1432, R = 0.0403 and wR = 0.0990. Complex 1 is characterized by an isolated structure. X-ray structure analysis of I shows that acac behaves as a chelating ligand and PPh3 coordinates as a monodentate ligand to the Cu(I) atoms. Photoluminescent investigation reveals that the title complex displays a strong green-light emission.展开更多
The symmetrical diketone Ⅱ, which can be synthesized in gram scale using a well established method, was used as a starting material to prepare the 11α-methoxy ketomethylene Ⅵ. This is in continuation of our study a...The symmetrical diketone Ⅱ, which can be synthesized in gram scale using a well established method, was used as a starting material to prepare the 11α-methoxy ketomethylene Ⅵ. This is in continuation of our study aiming at the synthesis of multihydroxylated cephalostatin analogues, as for example cephalostatin 1Ⅰ, a potent anti-tumor natural product. Compound Ⅵ underwent chemo- and regioselective hydroboration reaction at only one of △14.15 double bonds furnishing compound Ⅸ as a major product in a fair yield.展开更多
基金supported by the Natural Science Foundation of Inner Mongolia,China (No.2009MS0205)the Education Department of Inner Mongolia,China (No.NJcxy08124)
文摘Two new ternary complexes of 1-(2-thienyl)-3-(p-phenylethynylphenyl)-1,3-propanedione(HTPP) and 1,10-phenanthroline(phen) with Sm^3+ and Dy^3+ were synthesized.The composition of the ternary complexes was characterized as Sm(TPP)3phen and Dy(TPP)3phen,respectively,by infrared(IR) spectra,chemical analysis,elemental analysis,and thermodynamic analysis.At room temperature,under UV light excitation,the Sm^3+ and Dy^3+ complexes exhibit characteristic emissions of the central ions.It is found that the fluorescence intensity of Sm(TPP)3phen is stronger than that of Dy(TPP)3phen.In order to explain this phenomenon,an accurate quantum chemistry calculation was carried out,and the result is in good agreement with the experiment data.
文摘In this study,the interaction between primary amine and diketones was investigated.Three diketones with a general structure of—(CH2C(O)CH2C(O))-X-R(X is C,O or N and R is H and/or alkyl groups)were selected to react with primary amine in aqueous solutions.The reaction was in-situ monitored by Raman technique and the reaction products were identified by FTIR,NMR and LC-MS.It is found that the reaction products strongly depend on the structures of diketones.When X is nitrogen,the expected Schiff base or its analog can be obtained.However,Schiff base or its analog is not detected if X is C or O,instead,ion pairs or hydrolysis products are formed accordingly,suggesting critical impacts of acidity of CH2 inβ-diketone on the product formation.This study also shows that in-situ Raman is a powerful technique for reaction monitoring and structure characterization,which is useful for mechanism understanding.
文摘Poly(arylene ether diketone)s were prepared by the aromatic nucleophilic displacement reaction of 4,4'-difluorobenzil with different bisphenols in the presence of anhydrous potassium carbonate in diphenylsulfone at elevated temperature. The polymers obtained had inherent viscosity of 0.51 similar to 0.63 dL/g, and exhibited glass transition temperature ranging from 136 similar to 217 degrees C mainly depending on the bisphenols used in the polymer synthesis. Thermogravimetry of these polymers showed excellent thermal stability, indicating that 10% weight losses of the polymers were observed in the range above 428 degrees C and 438 degrees C in air and nitrogen, respectively. The mechanical properties of these polymers were also described and the permeability of five polymers for H-2, O-2 and N-2 was determined at 30 degrees C.
基金This work was supported by the National NatUral Science Foundation of China the Provincial Natural Science Foundation of Sha
文摘The reaction of 2-substituted imidazolinium salt with bis-Grignard reagents is reported and a new method for the synthesis of symmetric diketones from carboxylic acids and bis-Grignard reagents is provided.
基金supported by the National Key R&D Program of China(No.2020YFA0711003)the National Natural Science Foundation of China(No.51925506),and the XPLORER PRIZE.
文摘1-(4-ethylphenyl)-nonane-1,3-dione(0206)is an oil-soluble liquid molecule with rod-like structure.In this study,the chelate(0206-Fe)with octahedral structure was prepared by the reaction of ferric chloride and 1,3-diketone.The experimental results show that when using 0206 and a mixed solution containing 60%0206-Fe and 40%0206(0206-Fe(60%))as lubricants of the steel friction pairs,superlubricity can be achieved(0.007,0.006).But their wear scar diameters(WSD)were very large(532µm,370µm),which resulted in the pressure of only 44.3 and 61.8 MPa in the contact areas of the friction pairs.When 0206-Fe(60%)was mixed with PAO6,it was found that the friction coefficient(COF)decreased with increase of 0206-Fe(60%)in the solution.When the ratio of 0206-Fe(60%)to PAO6 was 8:2(PAO6(20%)),it exhibited better comprehensive tribological properties(232.3 MPa).Subsequent studies have shown that reducing the viscosity of the base oil in the mixed solution helped to reduce COF and increased WSD.Considering the COF,contact pressure,and running-in time,it was found that the mixed lubricant(Oil3(20%))prepared by the base oil with a viscosity of 19.7 mPa·s(Oil3)and 0206-Fe(60%)exhibited the best tribological properties(0.007,161.4 MPa,3,100 s).
基金grateful for the financial support from the National Natural Science Foundation of China(51875486 and 52122507)Sichuan Science and Technology Program(2021YFSY0017)the Fundamental Research Funds for the Central Universities(2682021ZTPY095).
文摘Achievement of steady and reliable super-low friction at the steel/steel contact interface,one of the most tribological systems applied for mechanical moving parts,is of importance for prolonging machine lifetime and reducing energy consumption.Here we reported that the superlubricity performance of the steel/steel sliding interface lubricated with tiny amounts of diketone solution strongly depends on the oxygen content in surrounding environment.The increase of oxygen not only significantly shortens the initial running-in time but also further reduces the stable coefficient of friction in superlubricity stage due to the enhancement of tribochemical reactions.On the one hand,more severe oxidation wear occurring at higher oxygen content facilitates material removal of the contact interface,lowering the contact pressure and the corresponding initial friction.On the other hand,the growth of iron ions during the shear process in high oxygen environment promotes the formation of chelate which acted as an effective lubricated film chemisorbed at the steel/steel friction interface to further lower the interfacial friction.The results provide a new opportunity to further optimize the tribological performance of diketone superlubricity system,especially towards the lubrication of mechanical engineering materials.
文摘The title compound of PhCH_3C_3HN_2 (O )C (O) (CH_2) _3C [N (CH_2 )_4 NH_2]C_3HN_2 (O)CH_3Ph (L), a new Schiff-base containing diketone, has been synthesized. Its crystal structure has been determined by X-ray diffraction analysis. The crystal, C_(30)H_(41)N_6O_(5.5) (L·0. 5C_2H_5OH·2H_2O) , is triclinic, space group P1 ,a=11.544 (1) , b=11. 723(5) , c=12. 344(2) A , a=80. 61(2) . β=84. 17(1) ,γ=78. 80(2)°.V=1612. 6(9) A ̄3, M_r=1147. 40, Z=2, D_x= 1. 18 g/cm ̄3 . μ=0. 77 cm-1, F(000) = 614. The final agreement factor R=0. 079 for 1828 independent reflections with I≥ 3σ(I) considered to be observed. L contains three functional groups:β-diketone,β-ketoimine(Schiff-base) and NH_2. The β-diketone group has partially delocalized. The pyrazoline plane is not coplanar with its connected phenyl plane. The big πbond is not extended between these planes. There are one ethanol and four water molecules in the crystal. Intermolecular hydrogen bonds may exist between C=O and H_2O. NH_2 and H_2O, H_2O and EtOH, or H_2O and H_2O.
文摘Solid state reactions between β diketones (HPMBP, HDBM) and LnAc 3· x H 2O(La,Nd: x =3/2;Tb: x =4) have been investigated at low heating temperature. Pure compounds of Ln(PMBP) 3 and Ln(DBM) 3 are obtained by solid state reaction, and characterized by elemental analysis, infrared radiation (IR),X ray diffraction (XRD) and photoacoustic spectra. The solid state reaction properties of β diketones and their influences on the structures of products are discussed.
基金Supported by the National Natural Science Foundation of China (50572030)the NSF of Fujian Province (2004HZ01-3)
文摘A novel complex Cu(PPh3)2(acac) 1 (PPh3 = triphenylphosphine, acac = acetylacetone) was obtained by a solution reaction and structurally characterized by X-ray diffraction. The crystal belongs to monoclinic, space group P21/n with a = 13.7361(8), b = 12.8204(7), c = 19.7638(13)A, β = 95.946(2)^o, C41H37CuO2P2, Mr= 687.19, V = 3461.7(4)A3, Z = 4, Dc = 1.319 g/cm^3, S = 1.067,μ(MoKa) = 0.758 mm^-l, F(000) = 1432, R = 0.0403 and wR = 0.0990. Complex 1 is characterized by an isolated structure. X-ray structure analysis of I shows that acac behaves as a chelating ligand and PPh3 coordinates as a monodentate ligand to the Cu(I) atoms. Photoluminescent investigation reveals that the title complex displays a strong green-light emission.
文摘The symmetrical diketone Ⅱ, which can be synthesized in gram scale using a well established method, was used as a starting material to prepare the 11α-methoxy ketomethylene Ⅵ. This is in continuation of our study aiming at the synthesis of multihydroxylated cephalostatin analogues, as for example cephalostatin 1Ⅰ, a potent anti-tumor natural product. Compound Ⅵ underwent chemo- and regioselective hydroboration reaction at only one of △14.15 double bonds furnishing compound Ⅸ as a major product in a fair yield.