掺杂电活性离子聚吡咯膜内的电荷传输

用循环伏安法和计时库仑法研究了掺杂亚铁氰化钾离子的聚哟咯膜内的电荷传输问题。实验结果表明，聚吡咯膜内的电荷传递可以处理成电子在膜内的扩散模型，电荷传递速度可以 用电子表观扩散系数（Ｄａｐｐ）来表征。Ｄａｐｐ的大小由聚合物膜的结构、电活怀离子之间的过及对离了在膜中的运动决定。     

Synthesis and Crystal Structure of 9-（ 4-M e tho xylphen yl ）-1,8-dioxo-3,4,5,6,7,9hexahydroxanthene under Microwave Irradiation

1INTRODUCTIONInthepastfewyears,potassiumchannelacti-vatorshavegainedincreasingattentionbecauseoftheirclinicalpotentialapplicationsinvariousdiseases.Oneofthemostpotentcompoundsamongthisnewclassofdrugsisthebenzopyranderivativecroma-kalim[1～4].Benzopyranaswellasitsderivativesex-hibitsextensivepharmacologicalandbiologicalacti-vities[5],suchasantibacterialactivities[6,,antitumor7]activity[8],hypotensiveeffect[9],antiproliferationef-fect[10],etc.Thetitlecompoundbearingabenzo-pyranstructuraluni…     

Investigations of precipitates in heat treated AgPd30/CuSn6 layers

The subject of the investigations are precipitation zones, which grew as a result of chemical diffusion in AgPd30/CuSn6 bimetals. These precipitation zones have been characterized by metallography, electron probe microanalysis and x-ray diffraction. The growth of precipitation zones in the plating layer and in the substrate layer in dependence on time have been determined. The use of x-ray diffraction alone for the identification of the precipitates could not supply satisfying results in every case. This problem was solved by the application of electron probe microanalysis using a correction method, which allows the estimation of the chemical composition of small particles.Dedicated to Professor Dr. rer. nat. Dr. h. c. Hubertus Nickel on the occasion of his 65th birthday     

Photo-induced Charge Separation of p-Tricyanovinyl-N,N-Dialkylanilines

In this paper,p-tricyanovinyl-N,N-dialkylanilines were synthesized as model compounds and through their spectroscopic behavior,the photo-induced electron transfer,charge separation were discussed and the aggregation in DMSO-H_2O system was investigated.     

伯溴代烷的微波快速合成法

198 6年Ｒ .Ｊ.Ｇｉｇｎｅｒｅ[1 ] 和Ｒ .Ｇｅｄｙｅ[2 ] 首次报道将微波用于有机合成反应以来 ,大量实验事实证明[3] 微波不仅能极大地提高某些化学反应速率 ,而且能使一些在常规加热条件下几乎不能进行的反应得以完成、获得满意的收率。用伯醇在溴化氢溶液中微波条件下发生反应制备了伯溴代烷。1　实验部分ＷｈｉｒｌｐｏｏｌＴ1 2 0Ｘ微波炉 (四川大学无线电系改装 ,可连续发射微波 ,功率连续可调 )、ＷＺＳ -Ｉ阿贝折光仪 (未校正 )。工业溴化氢 (Ｃ =40 % ,ｄ =1 38) ,其余试剂均为ＣＰ级。合成通法　将适量的醇、一定量的浓硫酸和过…     

微波辐射下一步合成3-氨基-4-氰基-1-芳基-5,6,7,8-四氢异苯并吡喃

亚环己基马来腈与芳醛在哌啶催化下,经微波辐射一步合成3-氨基-4-氰基-1-芳基-5,6,7,8-四氢异苯并吡喃,反应7～11min,产率57%～94%.     

Two-photon absorption in quadrupolar pi-conjugated molecules: influence of the nature of the conjugated bridge and the donor-acceptor separation

Quadrupolar-type substitution of pi-conjugated chromophores with donor and acceptor groups has been shown to increase their two-photon absorption (TPA) response by up to two orders of magnitude. Here, we apply highly correlated quantum-chemical calculations to evaluate the impact of the nature of conjugated bridge and the charge-transfer distance on that enhancement. We compare chromophores with phenylenevinylene-, thienylenevinylene-, polyene-, and indenofluorene-type backbones substituted by dimethylamino and cyano groups. In all compounds, we find a strongly TPA-active A(g) state (either 2A(g) or 3A(g)) in the low-energy region, as well as a higher lying TPA-active state (mA(g)) at close to twice the energy of the lowest lying one-photon allowed state; the smaller energy detuning in the mA(g) states results in very large TPA cross sections delta. We also investigate the influence of the degree of ground-state polarization on TPA. Independent of the nature of the backbone and the donor-acceptor separation, delta displays the same qualitative evolution with a maximum before the cyanine-like limit; the highest TPA cross sections are calculated for distirylbenzene- and polyene-based systems.     

Formation of Negative Hydrogen Ions in a Ne–H2 Hollow Cathode Discharge

The formation of negative hydrogen ions in a conventional hollow cathode discharge has been investigated. A mixture of Ne and H₂ proved to be more advantageous compared to pure hydrogen. The study has been performed by solving the electron Boltzmann equation, coupled with a system of balance equations for neon and hydrogen neutral and charged particles. The vibrational distribution function of hydrogen has been calculated. Our calculations show unusually high population of vibrationally excited hydrogen molecules in a Ne–H₂ mixture, which explains the high density of negative hydrogen ions under optimal conditions (total gas pressure of few Torr, hydrogen number mole fraction of 1–10% and discharge current of 10–100 mA). Line intensities originating from highly excited neon states vs. hydrogen pressure have been calculated and a comparison with existing experimental results has been made.     

激光诱导等离子体中的电子密度和电子温度的测量

脉冲激光诱发等离子体的谱诊断技术用来对其电子密度和电子温度的测量结果与理论计算进行了比较，同时讨论了运用这个方法的物理条件．     

Ab initio calculations of small hydrides including electron correlation

Five different structures of CH₅ ⁺ and one structure of CH₅ ^– are calculated using a gaussian basis both in the SCF approximation and with the inclusion of electron correlation in the independent electron pair approximation (IEPA). While on SCF level the C _sstructure of CH₅ ⁺ has to lowest energy, the energy difference between the C _sand C _2vstructures becomes negligible if correlation is included. In contrast to this the approach of a proton to CH₄ at large and intermediate distances is most favorable towards a corner of the CH₄ tetrahedron which means a structure. The decomposition of CH₅ ⁺ into CH₃ ⁺ and H₂ requires 20kcal/mol on SCF level and 40 kcal/mol if correlation is included.