5-邻硝基苯-10,15,20-三苯基卟啉-环糊精超分子体系研究

在中性磷酸盐缓冲溶液中,以紫外-可见分光光度法、荧光光谱法和1HNMR法研究了一种人工合成的非水溶性卟啉5-邻硝基苯-10,15,20-三苯基卟啉(简称o-NTPP)与3种母体环糊精α-CD、β-CD、γ-CD和β-CD的两种衍生物2,3,6-三-甲氧基-β-CD(TM-β-CD)、羧甲基-β-CD(CM-β-CD)之间相互作用形成的超分子体系,结果表明o-NTPP与TM-β-CD形成了1∶2的包结物,而与其它4种环糊精均形成1∶1的包结物。利用双倒数曲线法计算了o-NTPP-CD超分子体系的包结常数(k),同时对包结常数大小进行了比较,从而判断出5种环糊精对o-NTPP包结能力的大小,其中TM-β-CD表现出最强的包结能力。     

BATPPH_2及其Zn配合物与环糊精的超分子体系研究

设计合成了5-(4-苯甲酰亚胺基苯基)-10,15,20-三苯基卟啉(BATPPH2)及其锌配合物(BATPPZn),并通过1HNMR、IR、UV-Vis、元素分析等方法对化合物的结构加以确认。在中性磷酸盐缓冲溶液中,以荧光光谱法、紫外可见分光光度法和1HNMR法分别研究了BATPPH2和BATPPZn与α,β,γ-环糊精相互作用形成的超分子体系。利用双倒数曲线法计算了BATPPH2-CD和BATPPZn-CD超分子体系的包结常数,结果表明BATPPH2和BATPPZn与γ-CD的包结常数(K1γ-CD,K2γ-CD)最大,γ-CD表现出最强的包结能力,Zn2+的配位作用使包结物的稳定性降低。     

meso-四-(2-噻吩基)铜卟啉-环糊精超分子体系的光谱学研究

以紫外可见分光光度法和荧光光谱法研究了非水溶性meso-四-（2-噻吩基）铜卟啉（简称Cu—TTP）与四种环糊精α—CD、β—CD、γ—CD、TM—β—CD相互作用形成的超分子体系，结果表明Cu-TTP与TM-β-CD形成了1：2的包结物，而与其它三种环糊精主要形成1：1的包结物。在α—CD、β—CD、γ-CD三种母体环糊精中，α—CD与Cu—TTP的包结常数最大；β-CD与其衍生物TM-β-CD相比，TM-β-CD与Cu—TTP的包结常数较大。本文对四种环糊精和Cu-TTP的包结机理作了初步探讨。为铜卟啉和环糊精的相互作用及其超分子体系的研究提供了基础。     

四-(4-磺基苯)卟啉与环糊精超分子体系的电化学研究

以电化学方法研究了水溶性卟啉四-(4-磺基苯)卟啉(简称TPPS4)与两种环糊精羟丙基-α-环糊精(简称HP--αCD)、羟丙基-γ-环糊精(简称HP--γCD)的相互作用形成的超分子体系,结果表明TPPS4与HP--αCD、HP--γCD分别形成了1∶1、1∶2的包结物,它们的包结常数分别为8.78×103L/mol、4.58×109L2.mol-2。     

meso-四(4-甲氧基-3磺酸基苯)卟啉与环糊精超分子体系的研究

采用极谱法、紫外可见光谱法及荧光光谱法研究了水溶性卟啉T(4-Mop)PS4与α-CD、-βCD、γ-CD、Hp-β-CD及SBE--βCD 5种环糊精的相互作用,结果表明T(4-Mop)PS4分别与这5种环糊精形成了T(4-Mop)PS4-CD s超分子体系。此外,本研究还采用极谱法、紫外可见光谱法及荧光光谱法测定了T(4-Mop)PS4-CD s超分子体系的包结常数和包结比,比较了T(4-Mop)PS4与5种环糊精的包结能力,并由此推测了包结机理,为T(4-Mop)PS4卟啉、环糊精的进一步应用提供了理论信息。     

用分子光谱法研究两种水溶性卟啉与磺丁醚-β-环糊精的超分子体系

本文以紫外可见光谱法和荧光光谱法研究了水溶性的四-(4-甲基吡啶基)卟啉(TMPyP)和四-(4-羧基苯基)卟啉(TCPP)与磺丁醚-β-环糊精(SBE--βCD)形成的超分子体系。结果表明,两种卟啉与磺丁醚-β-环糊精都形成了1∶1的包结物,它们的包结常数分别为1.34×104L.mol-1和1.15×105L.mol-1。     

β-环糊精对聚氧乙烯十二烷基醚的双模式包结作用

通过表面张力法、浊点法、硫氰酸钴铵显色法和¹H NMR研究了β-环糊精(β-CD)对聚氧乙烯十二烷基醚(PL)的包结作用. 结果表明, β-CD可与PL形成2∶1和3∶1型两种超分子包结物, 表现出不同的物理化学性质. PL的疏水性烷基链被包络进β-CD空腔中, 形成了2∶1的超分子包结物;PL的亲水性聚氧乙烯基链被包络进β-CD空腔中, 形成了3∶1的超分子包结物. 结合实验结果, 通过比较β-CD和PL分子的大小, 提出了β-CD对PL分子两种可能的包结模式.     

环丙沙星与环糊精超分子体系的研究

利用荧光光谱法研究了环丙沙星与母体β-环糊精(β-CD)及其2种修饰衍生物羟丙基-β-环糊精(Hp-β-CD)、甲基-β-环糊精(Me-β-CD)形成的超分子体系,同时测定了3种超分子体系的猝灭常数和热力学参数.结果表明:环丙沙星与3种环糊精之间常温下均形成稳定的包合物;环丙沙星与3种环糊精包结过程中△G＜0和△H＜0,这说明环丙沙星与3种环糊精的包结能够自发进行而形成超分子体系,且反应为放热过程.通过对3种环糊精与环丙沙星的热力学数包结能力进行了比较,初步探讨了作用机理和影响包结能力大小的可能因素.     

β-环糊精与肉桂醇包结物的制备及包结性能的研究

本文期望对β-环糊精(β-CD)/肉桂醇包结物在食品、化妆品、医药等领域中的实际应用以及肉桂醇的水相有机反应提供理论基础。采用水溶液法制备肉桂醇与β-CD的包结物。在β-CD∶肉桂醇(摩尔比)=1∶1的基础上,以肉桂醇的包结率为考察指标,优选出的包结工艺为:包结温度为333 K,包结时间为1h,肉桂醇的包结率达到88.7%。通过DSC、1H NMR和UV-vis对包结物结构进行表征,表明β-CD与肉桂醇形成了摩尔比为1∶1的包结物,298K时的包结常数为206 M-1,ΔG为-13.2 kJ·mol-1,表明此包结过程是一个自发的过程。进一步用PM3/ONIOM分层法对β-CD/肉桂醇包结物的最稳定结构进行了分子模拟,认为包结物的最稳定结构为肉桂醇的羟基位于β-CD的小口端。     

用3种不同方法研究铬黑-T与β-CD的相互作用

本文以极谱法、荧光光谱法和紫外可见光谱法研究了铬黑-T与β-环糊精(β-CD)的相互作用。实验结果表明,二者可发生作用,形成铬黑-T-β-CD的超分子体系。此外,本文还分别采用极谱法和紫外可见光谱法对铬黑-T-β-CD的超分子体系的包结比和包结常数进行测定,包结比为1∶1,包结常数为6.05×106L/mol,并初步推断了铬黑-T和β-CD的结合形式。     

Sc2MgGa2 and Y2MgGa2

Scandium magnesium gallide, Sc₂MgGa₂, and yttrium magnesium gallide, Y₂MgGa₂, were synthesized from the corresponding elements by heating under an argon atmosphere in an induction furnace. These intermetallic compounds crystallize in the tetragonal Mo₂FeB₂‐type structure. All three crystallographically unique atoms occupy special positions and the site symmetries of (Sc/Y, Ga) and Mg are m2m and 4/m, respectively. The coordinations around Sc/Y, Mg and Ga are pentagonal (Sc/Y), tetragonal (Mg) and triangular (Ga) prisms, with four (Mg) or three (Ga) additional capping atoms leading to the coordination numbers [10], [8+4] and [6+3], respectively. The crystal structure of Sc₂MgGa₂ was determined from single‐crystal diffraction intensities and the isostructural Y₂MgGa₂ was identified from powder diffraction data.     

Zur Kenntnis der Dialkalimetalldichalkogenide β-Na2S2, K2S2, α-Rb2S2, β-Rb2S2, K2Se2, Rb2Se2, α-K2Te2, β-K2Te2 und Rb2Te2

On Dialkali Metal Dichalcogenides β-Na₂S₂, K₂S₂, α-Rb₂S₂, β-Rb₂S₂, K₂Se₂, Rb₂Se₂, α-K₂Te₂, β-K₂Te₂ and Rb₂Te₂ The first presentation of pure samples of α- and β-Rb₂S₂, α- and β-K₂Te₂, and Rb₂Te₂ is described. Using single crystals of K₂S₂ and K₂Se₂, received by ammonothermal synthesis, the structure of the Na₂O₂ type and by using single crystals of β-Na₂S₂ and β-K₂Te₂ the Li₂O₂ type structure will be refined. By combined investigations with temperature-dependent Guinier-, neutron diffraction-, thermal analysis, and Raman-spectroscopy the nature of the monotropic phase transition from the Na₂O₂ type to the Li₂O₂ type will be explained by means of the examples α-/β-Na₂S₂ and α-/β-K₂Te₂. A further case of dimorphic condition as well as the monotropic phase transition of α- and β-Rb₂S₂ is presented. The existing areas of the structure fields of the dialkali metal dichalcogenides are limited by the model of the polar covalence.     

Crystal Structures of [Bu2Sn(O2PPh2)2], [Ph2Sn(O2PPh2)2], and [PhClSn(O2PPh2)OMe]2. Raman Spectra of [Ph2Sn(O2PPh2)2] and [PhClSn(O2PPh2)OMe]2

[(n‐Bu)₂Sn(O₂PPh₂)₂] ( 1 ), and [Ph₂Sn(O₂PPh₂)₂] ( 2 ) have been synthesized by the reactions of R₂SnCl₂ (R=n‐Bu, Ph) with HO₂PPh₂ in Methanol. From the reaction of Ph₂SnCl₂ with diphenylphosphinic acid a third product [PhClSn(O₂PPh₂)OMe]₂ ( 3 ) could be isolated. X‐ray diffraction studies show 1 to crystallize in the monoclinic space group P2₁/c with a = 1303.7(1) pm, b = 2286.9(2) pm, c = 1063.1(1) pm, β = 94.383(6)°, and Z = 4. 2 crystallizes triclinic in the space group , the cell parameters being a = 1293.2(2) pm, b = 1478.5(4) pm, c = 1507.2(3) pm, α = 98.86(3)°, β = 109.63(2)°, γ = 114.88(2)°, and Z = 2. Both compounds form arrays of eight‐membered rings (SnOPO)₂ linked at the tin atoms to form chains of infinite length. The dimer 3 consists of a like ring, in which the tin atoms are bridged by methoxo groups. It crystallizes triclinic in space group with a = 946.4(1) pm, b = 963.7(1) pm, c = 1174.2(1) pm, α = 82.495(6)°, β = 66.451(6)°, γ = 74.922(6)°, and Z = 1 for the dimer. The Raman spectra of 2 and 3 are given and discussed.     

Electrochemical study of (NEt4)2Cl2FeS2MoS2 and (NEt4)2Cl2FeS2MoS2FeCl2

Summary The ability of [MoS₄]^2–, anions to be used as ligands for transition metal ions has been widely demonstrated, especially with Fe²⁺. The present study has been restricted to linear complexes such as (NEt₄)₂ [Cl₂FeS₂MoS₂] and (NEt₄)₂[Cl₂FeS₂MoS₂FeCl₂]. Their electrochemical properties are described: upon electrochemical reduction, these compounds yield MoS₂, as a black precipitate, and an iron complex in solution, assumed to be [SFeCl₂]^2–. The electrochemical reduction goes through two electron transfers, coupled with the breakdown of the molecular skeleton: a DISPl and an ECE mechanism. Depending on the solvent, the following equilibrium may be observed: [Cl₄Fe₂MoS₄]^2–[Cl₂FeMoS₄]^2–+FeCl₂. The equilibrium constant, K_D, was evaluated by differential pulse polarography. K_D is tightly related to the donor number of the solvent.     

Syntheses,Spectroscopic Studies,and Crystal Structures of Me2Sn(O2PPh2)2, Ph2Pb(O2PMe2)2, and Ph2Pb(O2PPh2)2

Me₂Sn(O₂PPh₂)₂ ( 1 ), Ph₂Pb(O₂PMe₂)₂ ( 2 ), and Ph₂Pb(O₂PPh₂)₂ ( 3 ) have been synthesized by the reactions of Me₂SnCl₂ or Ph₃PbCl with the corresponding diorganophosphinic acid in methanol. X‐ray diffraction studies show that the diorganophosphinate groups behave as double bridges between the metal atoms leading to polymeric ring‐chain structures with M₂O₄P₂ (M = Pb, Sn) eight‐membered rings. The organic groups bonded to the metal atoms are in trans‐position in the resulting octahedral arrangement around the metal atoms. The IR and the mass spectra were reported and discussed.     

Thermal decomposition of Me3SnO2PCl2, Me2Sn(O2PCl2)2 and Ph3SnO2PCl2

TG and DTA studies on Me₃SnO₂PCl₂, Me₂Sn(O₂PCl₂)₂ and Ph₃SnO₂PCl₂ were carried out under dynamic argon atmosphere. The results show that the decomposition proceeds in different stages leading to the formation of Sn₃(PO₄)₂ as a stable product. This compound was characterized by IR spectroscopy. Decomposition schemes involving reductive elimination reactions were proposed.     

The alkali hypophosphites KH2PO2, RbH2PO2 and CsH2PO2

The structures of the hypophosphites KH₂PO₂ (potassium hypophosphite), RbH₂PO₂ (rubidium hypophosphite) and CsH₂PO₂ (caesium hypophosphite) have been determined by single‐crystal X‐ray diffraction. The structures consist of layers of alkali cations and hypophosphite anions, with the latter bridging four cations within the same layer. The Rb and Cs hypophosphites are isomorphous.