A new ionic pair complex,1,2′-dinithile-1,2′-dithiolene nickel(II) containing substituted benzylpyridinium [Bz(Me)Py]2[Ni(mnt)2],is prepared and characterized by elemental analyses,IR,UV-VIS and single crystal X-ray...A new ionic pair complex,1,2′-dinithile-1,2′-dithiolene nickel(II) containing substituted benzylpyridinium [Bz(Me)Py]2[Ni(mnt)2],is prepared and characterized by elemental analyses,IR,UV-VIS and single crystal X-ray diffraction.Where [Bz(Me)Py]+ was 1-(1′-phenylethyl)-pyridinium and mnt2-is 1,2′-dinithile-1,2′-dithiolene.The crystal structure was solved by direct method and refined by full-matrix least-squares methods for All the nonhydrogen atoms.The final R1 and wR2 for all data were 0.0450 and 0.1236,respectively.The complex is composed of two [Bz(Me)Py]+ cations and a [Ni(mnt)2]2-anion.The [Ni(mnt)2]2-anions form a stepwise structure by π-π stacking interactions between the CN groups.The cation-anion C-H···N hydrogen bonds and cation-cation C-H···π interactions give further rise to a network structure.展开更多
The esterification of carboxylic acid with alcohol in the presence of catalytic amounts of mineral acids is one of the most methods for preparing esters.The catalysts generally preferred are sulfuric acid or p-toluene...The esterification of carboxylic acid with alcohol in the presence of catalytic amounts of mineral acids is one of the most methods for preparing esters.The catalysts generally preferred are sulfuric acid or p-toluenesulfonic acid.But the products esters were racemic when（S）-3-（2′-oxocyclohexyl） propionic acid reacts with alcohols in the presence of sulfuric acid or with p-toluenesulfonic acid as catalyst.We replace sulfuric acid with Fe2(SO4)3·xH2O as the catalyst.The optical compound（S）-methyl-3-（2′-oxocyclohexyl）propionate,（（S）-ethyl-3-）（2′-oxocyclohexyl）propionate and（S）-n-butyl-3-（2′-oxocyclohexyl）propionate were obtained.In this paper we also reported that cyclohexanone reacted with methyl acrylate in the presence of potassium thiazolidine-2-thione-4-carboxylate（R）TTCA·K as the chiral catalyst to afford optically active（S）-3-（2′-oxocy-clohexyl） propionate.The mechanism of reaction of cyclohexanone with methyl acrylate in the presence of（R）TTCA·K as the catalyst would be a complex process.展开更多
Poly(2-methoxy-5-(2′-ethylhexyloxy)- p -phenylenevinylene) (MEH-PPV) has been prepared by a liquid/solid two-phase reaction.The liquid phase is tetrahydrofuran containing 1,4-bis(chloromethyl)-2-methoxyl-5-(2′-ethyl...Poly(2-methoxy-5-(2′-ethylhexyloxy)- p -phenylenevinylene) (MEH-PPV) has been prepared by a liquid/solid two-phase reaction.The liquid phase is tetrahydrofuran containing 1,4-bis(chloromethyl)-2-methoxyl-5-(2′-ethylhexyloxy) benzene as the monomer and a certain amount of tetrabutylammonium bromide (TBAB) as phase transfer catalyst (PTC).The solid phase is potassium hydroxide particles with diameters smaller than 0 5 mm.Gelation was found in the polymerization processes.As a result,MEH-PPV is partly soluble because of its large molar mass.Soluble MEH-PPV was obtained by using bromomethylbenzene as retardant regent.The molar mass of soluble MEH-PPV was measured to be 6 4×10 4g/mol.The Structure of polymer was identified by IR,Raman,UV/vis and PL spectra.A thin compact film of MEH-PPV can be formed by spin-coating and it emit a yellow light.展开更多
文摘A new ionic pair complex,1,2′-dinithile-1,2′-dithiolene nickel(II) containing substituted benzylpyridinium [Bz(Me)Py]2[Ni(mnt)2],is prepared and characterized by elemental analyses,IR,UV-VIS and single crystal X-ray diffraction.Where [Bz(Me)Py]+ was 1-(1′-phenylethyl)-pyridinium and mnt2-is 1,2′-dinithile-1,2′-dithiolene.The crystal structure was solved by direct method and refined by full-matrix least-squares methods for All the nonhydrogen atoms.The final R1 and wR2 for all data were 0.0450 and 0.1236,respectively.The complex is composed of two [Bz(Me)Py]+ cations and a [Ni(mnt)2]2-anion.The [Ni(mnt)2]2-anions form a stepwise structure by π-π stacking interactions between the CN groups.The cation-anion C-H···N hydrogen bonds and cation-cation C-H···π interactions give further rise to a network structure.
文摘The esterification of carboxylic acid with alcohol in the presence of catalytic amounts of mineral acids is one of the most methods for preparing esters.The catalysts generally preferred are sulfuric acid or p-toluenesulfonic acid.But the products esters were racemic when（S）-3-（2′-oxocyclohexyl） propionic acid reacts with alcohols in the presence of sulfuric acid or with p-toluenesulfonic acid as catalyst.We replace sulfuric acid with Fe2(SO4)3·xH2O as the catalyst.The optical compound（S）-methyl-3-（2′-oxocyclohexyl）propionate,（（S）-ethyl-3-）（2′-oxocyclohexyl）propionate and（S）-n-butyl-3-（2′-oxocyclohexyl）propionate were obtained.In this paper we also reported that cyclohexanone reacted with methyl acrylate in the presence of potassium thiazolidine-2-thione-4-carboxylate（R）TTCA·K as the chiral catalyst to afford optically active（S）-3-（2′-oxocy-clohexyl） propionate.The mechanism of reaction of cyclohexanone with methyl acrylate in the presence of（R）TTCA·K as the catalyst would be a complex process.
文摘Poly(2-methoxy-5-(2′-ethylhexyloxy)- p -phenylenevinylene) (MEH-PPV) has been prepared by a liquid/solid two-phase reaction.The liquid phase is tetrahydrofuran containing 1,4-bis(chloromethyl)-2-methoxyl-5-(2′-ethylhexyloxy) benzene as the monomer and a certain amount of tetrabutylammonium bromide (TBAB) as phase transfer catalyst (PTC).The solid phase is potassium hydroxide particles with diameters smaller than 0 5 mm.Gelation was found in the polymerization processes.As a result,MEH-PPV is partly soluble because of its large molar mass.Soluble MEH-PPV was obtained by using bromomethylbenzene as retardant regent.The molar mass of soluble MEH-PPV was measured to be 6 4×10 4g/mol.The Structure of polymer was identified by IR,Raman,UV/vis and PL spectra.A thin compact film of MEH-PPV can be formed by spin-coating and it emit a yellow light.
