Inclusion complexes of alcohols with α-cyclodextrin

Calorimetric studies of the inclusion complexes of straight and branched alcohols and of diols with alpha-cyclodextrin (-CD) have been carried out in water solvent. The data suggest that straight and branched chain alcohols enter the cavity of -CD alkyl end first. The hydroxyl group hydrogen bonds to the outer oxygen ring of the cyclodextrin. For branched chain alcohols the longer alkyl part of the molecule penetrates the -CD cavity up to the hydroxyl group. Diols form two hydrogen bonds to the outer oxygen ring of the cyclodextrin with some penetration into its interior.     

A New Method to Investigate the Clustering Phenomena in Supercritical Fluids

EstimationoflocaldensityofsolventaboutthesoluteSolvatochromicbehaviorsofspectroscopicprobesarewidelyusedtoestimatethesol-ventstrengthofsupercriticalfluids(SCF,).i-3lnthiswork,thesolvatochrondcshiftofthen-n*transitionbandforacetone(O.o37mo1.L-')insupercrihcal(SC)CO2wasde-terminedbyUVspectroscopytostUdythesolvationeffect.TheMcRae-BaylissexpressionbasedonthedielectriccontinUUInmodelgivestherelahonshipbetWeenso1vatochromicshiftandpo1arizabilityofnonPolarsolvents4-5asfollows:wherevisthewave…     

若干锰(Ⅲ)希夫碱配合物的合成和表征

合成了六种锰(Ⅲ)希夫碱配合物:Mn(bzacem)X(X~-=Cl~-,Br~-,I~-,NCS~-,NO_2~-)和Mn(bzacen)ClO_4·2H_2O,其中bzacen~(2-)为N,N′-二(苯甲酰丙酮缩)-乙二胺阴离子.用NMR法测定配合物在DMSO溶液中的有效磁矩值为4.46—4.63,表明为高自旋配合物,将电子光谱中的吸收带分别按配位场带、荷移带和配体带进行了归属,在配合物的红外光谱中,原配体H_2bzacen中的ν_(N-H)带消失,ν_(C-O)带移向低频,并对Mn-O、Mn-N和Mn-X的伸缩带进行了归属。     

Mn_3O(Salea)_2(C_2H_3O_2)_3·HC_2H_3O_2的合成、表征及放氧活性测定

合成了三核锰(Ⅲ)Schiff碱配合物:Mn_3O(Salea)_2(C_2H_3O_2)_3·HC_2H_3O_2(其中Salea~(2-)为水杨醛缩乙醇胺Schiff碱阴离子),经元素分析、磁矩、化合价、电导率、热分析、红外、紫外光谱等进行表征,并利用氧电极进行了放氧活性测试,发现在对苯醌存在下配合物能促使水分解释放氧气,其反应受温度、对苯醌和配合物浓度等因素影响,并提出了可能的放氧反应方程.     

对硝基氯苄与活性亚甲基化合物的反应

对硝基苄基衍生物可以与许多阴离子起单电子转移的亲核取代反应。Kornblum等以对硝基氯苄为底物,2-乙氧羰基香豆满-3-酮的钠盐为阴离子,作了深入的研究,得出对硝基氯苄与2-乙氧羰基香豆满-3-酮钠盐的C-烷化反应机理为自由基链式亲核取代反应。同时,Russell等提出对硝基氯苄与2-     

REDUCING NONSELECTIVE PROTEIN ADSORPTION AND CELL ADHESION ON POLYACRYLONITRILE FILMS BY COPOLYMERIZATION OF ACRYLONITRILE WITH α-ALLYL GLUCOSIDE

In this work, the surface properties of novel sugar-containing polymers, α-allyl glucoside (AG)/acrylonitrile (AN)copolymers, were studied by contact angle, protein adsorption and cell adhesion measurements. It was found that the contactangle of the copolymer films decreased from 68° to 30° with the increase of AG content in the copolymer. The adsorptionamount of bovine serum albumin (BSA) and the adhesive macrophage onto the film surface also decreased significantly withincreasing α-allyl glucoside content from 0 to 42 wt% in the copolymer. These preliminary results reveal that both thehydrophilicity and the biocompatibility of polyacrylonitrile-based membranes could be improved by copolymerizing acrylonitrile with vinyl carbohydrates.     

甲基紫修饰的微晶酚酞分离富集-光度法测定痕量铋(Ⅲ)的研究

建立了以修饰有甲基紫(MV)的微晶酚酞作为固相吸附剂分离富集和测定环境样品中痕量Bi(Ⅲ)的新方法.研究表明,Bi(Ⅲ)与I-、 MV 形成三元离子缔合物[BiI6] (MV)3能定量吸附在微晶酚酞上,在适当条件下,Bi(Ⅲ)能与Co(Ⅱ)、 Ni(Ⅱ)、 Mn(Ⅱ)、 Fe(Ⅱ)、 Al(Ⅲ)、 Zn(Ⅱ)等常见阳离子分离,且基本不受Br-、 SCN-、 SO42-、 NO3-、 Cl-、 ClO4-等阴离子影响.Bi(Ⅲ)的静态吸附容量为0.81 mmol/g,富集因数可达200倍,回收率在97.2%以上,RSD 1.3%～2.2%之间.已应用于环境水样中Bi(Ⅲ)的测定.     

A New Saponin Transformed from Ginsenoside Rh1 by Bacillus subtilis

A novel saponin was isolated from the transformed products of ginsenoside Rh1 by Bacillus subtilis. It‘s structure was determined to be 3-O-β-D-glucopyranosyl-6-O-β-D-glucopyranosyl-20 (S)-protopanaxatriol on the basis of the spectral data.     

Volumetric Properties for the Electrolyte (NaCl,NaBr and NaI) Monosaccharide (D‐Mannose and D‐Ribose)‐Water Systems at 298.15 K

Densities have been measured for the electrolyte (NaCl, NaBr and NaI)‐monosaccharide (D ‐mannose and D‐ribose)‐water solutions at 298.15 K. These data have been used to calculate the apparent molar volumes of the saccharides (V_Φ,S) and electrolytes (V_Φ,E) in the studied solutions. Infinite dilution apparent molar volumes, V_Φ,S⁰ and V_Φ,E⁰, have been evaluated, together with the standard transfer volumes of the saccharides (Δ_tV_S⁰) from water to aqueous electrolyte solutions and those of the electrolytes (Δ_tV_E⁰) from water to aqueous saccharide solutions. It was shown that both the Δ_tV_S⁰ and Δ_tV_E⁰ values are positive and increase with increasing molalities of sodium halides and saccharides, respectively. Overall, the Δ_tV_S⁰ and Δ_tV_E⁰ values have the order of NaCl > NaBr > NaI except for NaI‐ribose and NaI‐ribose. Volumetric interaction parameters for the electrolyte‐monosaccharide pairs in water were obtained and interpreted by the stereochemistry of the monosaccharide molecules and the structural interaction model.     

Two new sesquiterpene lactones with the sulfonic acid group from Saussurea lappa

Two new sesquiterpene lactones with the unusual sulfonic acid group, 13-sulfo-dihydrosantamarine (1) and 13-sulfo-dihydroreynosin (2), have been isolated from the roots of Saussurea lappa C. Their structures, including the absolute configurations, were elucidated by spectroscopic methods.