对世界科学的巨大贡献——贺H.H.谢苗诺夫获诺贝尔奖金

苏联学者尼古拉·尼古拉耶维奇·谢苗诺夫院士和英国学者C.H.欣谢伍德由于研究化学反应机构有出色成就,于1956年获得了瑞典科学院授与的诺贝尔奖金。H.H.谢苗诺夫院士和其学派的成就所获得的崇高国际评价,同     

高分子科学的开拓者——H.F.马克教授

高分子科学的诞生和发展闪耀着施陶丁格、马克、卡罗泽斯、弗洛里、齐格勒和纳塔等人的光辉。马克以他长期从事高分子科学的研究、教育、编辑、国际交流     

H. C. Brown Centennial (1912–2004)

Herbert Brown discovered the reaction of hydroboration and the most successful compound he made was sodium borohydride. His life and research activities took interesting turns and seemed often governed by serendipity. He was consistent in his hard work and dedication to chemistry. He was both an inorganic and an organic chemist and his research often presented challenges to the structural chemists.     

H.C.Brown在世纪末寄给亲友及同行们的贺年信

亲爱的家人、过去和现在的合作者及朋友们:Sarah和我刚从SheboyganFalls参加Aldrich公司生产有机硼烷和其它有机金属化合物新厂的落成典礼回来。我决定把这封信作为我向该公司将有机硼烷的商业化表示谢意。60年前,二硼烷是一种稀有的化合物,当时在全世界上只有两个实验室?..     

诺贝尔化学奖获得者Robert H.Grubbs教授专访

Robert H.Grubbs,2005年诺贝尔化学奖获得者之一,美国加州理工大学＂Victor and Elizabeth Atkins＂教授.他出生并成长于美国肯塔基州,在美国佛罗里达大学获得学士和硕士学位,博士毕业于美国哥伦比亚大学,师从Ronald Breslow教授.     

C.P.M.G脉冲序列对~1H NMR中水信号的消除

用 C.P.M.G 脉冲序列在适当的τ值下,可使具有相当短的驰豫时间 T_2的质子从图谱中消失。铵类的质子具有与水的质子交换的性质,且交换的速度对水质子的 T_2有较大的影响。据此,本文通过系列试验,筛选出效果较好的硫酸铝铵,作为缩短水的质子的 T_2,使在 ~1H NMR 分析中采用 C.P.M.G 法消涂水的信号得以实现,并探索其使用条件及范围。在 pH 值1.0～9.2加入硫酸铝铵的量为0.25～0.35M 的条件下,分别以含少量的 N-羟甲基丙烯酰胺水溶液和含少量乙酸乙酯水溶液作为测试样品,进行水峰消除试验,取得甚好的效果。     

Two New Compounds from Melanosciadum pimpinelloideum H. Boiss

Melanosciadum pimpinelloideum H. Boiss (Umbelliferae), an indigenous plant，is the unique representative of species Melanosciadum1. Anomalin and 3(-angeloyl-4(-hydroxy-trans-khellactone were isolated from this plant2. In this investigation, from the whole plants two new compounds, melanochromone 1 and 2-ethoxyl-2-(4-hydroxyphenyl)ethanol 2 were isolated with known compounds 1-(4-hydroxyphenyl)-1,2-ethanediol 33, tymine (5-methyluracil) 44, cimifugin 55, umtatin 65, bergenin 76, daucosterol 87…     

Perspective on “An extended Hückel theory. I. Hydrocarbons”

 The size-consistent self-consistent matrix dressing method has been applied on an open-shell single-configuration reference state. Once the reference state is converged, several low-lying roots can be obtained for the dressed configuration interaction (CI) matrices of appropriate symmetry. The CI matrices were built with a complete-active-space singles and doubles CI method in order to deal properly with multiconfiguration excited states. The vertical ionization and ionization–excitation transitions are obtained from the difference to the closed shell ground-state energy of the neutral molecule. The method has been applied to NH⁺ ₃ and N⁺ ₂ using atomic natural orbital basis sets and state-average adapted molecular orbitals. Two ²A₁ states, very similar and showing great mixing of the (2a _l ⁻¹) and (3a _l ⁻²5a _l ¹) determinants, can be assigned to the broad asymmetric band at 27.6 ± 2 eV in the photoelectron spectrum of NH₃. The possible contribution of a ²Π _g (3σ _g ⁻²1π _g ¹) state to the A shake-up peak of N₂ at 24.6 eV is also discussed. Other states, doublets and quadruplets, are reported for both systems up to 30 eV for NH₃ and 37 eV for N₂. Received: 16 September 1999 / Accepted: 3 February 2000 / Published online: 2 May 2000     

苏联国立大学化学专业教学计划简介

最近,我们看到苏联高等和中等专业教育部于1982年11月15日批准颁布的苏联国立大学化学专业教学计划。这是近些年来,我们看到的最完整的苏联国家颁发的化学专业教学计划。现将其主要内容简介如下,并与我国综合大学化学专业现行教学计划做些比较。苏联高等和中等专业教育部颁布的这个教学计划,是法定教学计划,国立各大学现在仍执行这个计划。该教学计划规定国立大学化学专业的培养目标是“化学工作者(Химик)”和“教师(Преподаватель)”,