ChemInform Abstract: Thermolysis of NH4HCO3: A Simple Way to Free Carbonic Acid,H2CO3, in the Gas Phase.

Mass spectrometric results indicate that thermolysis of NH₄HCO₃ results in the formation of the radical cation CH₂O+· 3 (I), (m/z 62).     

ChemInform Abstract: Direct Observation of New Antimony-containing Anions: SbH2O-, Sb3-, and Monomeric Sb3O5-.

The novel title anions are generated in the source of a mass spectrometer under negative chemical ionization conditions Starting from Sb(OBu)₃.     

ChemInform Abstract: Matrix Isolation and Mass Spectrometric Studies on Selenium Trioxide Vapour: The Characterisation of Monomeric SeO3.

(SeO₃)₄ is shown to be the major species in the vapour above heated selenium trioxide, while above mixtures of H2SeO4/P2O5 significant portions of monomeric SeO₃ are observed.     

Synthesen und Eigenschaften von Bis(perfluoralkyl)zink‐Verbindungen

Syntheses and Properties of Bis(perfluoroalkyl)zinc Compounds The conditions for the syntheses of bis(perfluoroalkyl)zinc compounds Zn(R_f)₂ · 2 D (R_f = C₂F₅, n‐C₃F₇, i‐C₃F₇, n‐C₄F₉, n‐C₆F₁₃, n‐C₇F₁₅, and n‐C₈F₁₇; D = CH₃CN, tetrahydrofurane, dimethylsulfoxide) are described. Mass spectra, thermal decompositions, ¹⁹F‐ and ¹³C‐NMR spectra are discussed.     

ChemInform Abstract: Dimers and Tetramers of SiCl in a Molecular Beam from a Heterogeneous,Intermediate-Pressure Reactor.

Unusual molecules like Si₂Cl₂ and Si₄Cl₄ can be detected by mass spectrometry in a molecular beam extracted from a promising new type of source.     

ChemInform Abstract: Experimental Evidence for the Existence of Neutral P6: A New Allotrope of Phosphorus.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.     

四氢叶酸辅酶模型1, 2, 3-三取代咪唑啉盐的质谱裂解行为

讨论了１,２,３－不对称取代咪唑啉盐各种离子的生成途径以及取代基对裂解方式的影响并分析了该类化合物的主要裂解方式。在所有中的均ｍ／ｚ＝１２７（１＾＋）的离子峰和有机正离子Ａ峰存在,表明化合物１和２均有机正离子和碘离子形成的盐。化合物１和２的质谱有相似的裂解方式;有机正离子发生失掉氮原子上的一个取代基而保留咪唑啉环产生Ｄ,Ｅ,Ｆ离子的裂解方式。更重要的是咪唑啉环有相同的裂解方式：Ｃ＾２－Ｎ＾３键和Ｃ     

ChemInform Abstract: Experimental Detection of Tetranitrogen.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.     

四氢叶酸辅酶模型1, 2, 3-三取代咪唑啉盐的质谱裂解行为

讨论了１ ,２ ,３不对称取代咪唑啉盐各种离子的生成途径以及取代基对裂解方式的影响并分析了该类化合物的主要裂解方式。在所有实验中均有 ｍ／ｚ ＝ １２７（ Ｉ＋ ） 的离子峰和有机正离子 Ａ 峰存在,表明化合物１ 和２ 均为有机正离子和碘离子形成的盐。化合物１ 和２ 的质谱有相似的裂解方式：有机正离子发生失掉氮原子上的一个取代基而保留咪唑啉环产生 Ｄ, Ｅ, Ｆ 离子的裂解方式。更重要的是咪唑啉环有相同的裂解方式： Ｃ２ Ｎ３ 键和 Ｃ５ Ｎ１ 键同时断裂产生 Ｇ 离子碎片,以及 Ｃ２ Ｎ３ 键和 Ｃ４ Ｃ５ 键同时断裂产生 Ｈ 离子碎片。由于化合物１ 和２ 环上所连接的取代基不同而导致了其质谱裂解方式和程度的差异。化合物２ 的有机正离子 Ａ部分较稳定,质谱中表现为基峰,其 Ｅ, Ｆ 离子峰很弱;化合物１ 的有机正离子 Ａ 稳定性差,其相对丰度很小,其 Ｅ, Ｆ 离子峰较强。化合物１ｃ ,１ｄ ,１ｅ 的质谱中出现了比 Ａ 离子少三个单位的 Ｃ 离子峰,这是一种较特殊的裂解方式。     

四种新型火药的场解吸和解吸电子轰击质谱研究

本文采用FDMS和DElMS对4种新型火药进行了质谱分析,均得到了很强的分子离子峰和特征碎片峰,并对样品A进行了DEIMS的亚稳分析,得出了该类化合物的裂解规律为:M-n(NO),M-n(O),M-n(NO_2),M-n(HNO_2),M-n(OH)等。     

ChemInform Abstract: The Characterization of Molecular Boric Acid by Mass Spectrometry and Matrix Isolation IR Spectroscopy.

Molecular H₃BO₃ is obtained by heating crystalline orthoboric acid in vacuo to ∼ 40 °C. The IR spectrum of this species isolated in low-temp.     

ChemInform Abstract: Photoionization Spectra of Cesium and Cesium Oxide Clusters.

Seven cesium and 86 oxidized cesium clusters, CsnOm (0 < m < n; n = 3-14), are ionized in a one-photon process by means of a tunable cw dye laser and detected in a mass spectrometer.     

Chlorofluorieren mit Trifluormethylhypochlorit CF3OCl. Darstellung und spektroskopische Charakterisierung von Trifluormethyliodchloridfluorid CF3I(Cl)F

Chlorofluorinate with Trifluoromethylhypochlorite CF₃OCl. Preparation and Spectroscopic Characterization of Trifluormethyliodinechloridefluoride CF₃I(Cl)F The preparation of a new iodine(III) compound, trifluormethyliodinechloridefluoride CF₃I(Cl)F, via oxidative addition of trifluoromethylhypochlorite CF₃OCl to trifluoromethyliodide CF₃I is described. The thermolabile compound has been characterized by i.r., Raman, ¹⁹F NMR, and mass spectroscopy.     

Prediction of olefin IR spectra reasoning from their mass spectra

Possible appliance of low resolution mass spectra in QSPR studies to predict IR spectra of olefins in gas phase is considered. The prediction quality is characterized by values of correlation coefficients from 0.961 to 1.00 between computed and experimental vector representations of IR spectra.     

多硝基多甲基取代苯的核磁共振氢谱及质谱研究

报道了4个多硝基取代苯的核磁共振氢谱及电子轰击质谱,结果表明,苯环上的氢由于受硝基的强吸电子诱导效应的影响,其质子化学位移出现于低场,同时苯环的甲基取代基也因受到负电性的影响,其化学位移值变大.在TPX、DPX、TMX、TNTM 的EIMS中,消去OH基的'邻位效应'和CNO2键的裂分及出现相同的最终裂解碎片是此类化合物的质谱特征.     

Derivate von Tricyanmethan. 2. Untersuchungen über Methyltricyanmethan (1,1,1-Tricyanethan) [1]

Derivatives of Tricyanomethane. 2. Studies on Methyl Tricyanomethane (1,1,1-Tricyanoethane) The title compound H₃C? C(CN)₃ has been characterized by means of nuclear magnetic resonance, vibrational, and mass spectra.     

N，N-二(2-氨乙基)-N-8-甲基喹啉胺及其衍生物的配位化学研究

Two new types of tripodal Cu(Ⅱ) and Zn(Ⅱ) complexes with 8-methyquinoline as an arm were synthesized. Their compositions and structures were characterized by elemental analyses, conductitivies, IR, MS and NMR spectra. Moreover the electronic spectra, room temperature magnetic susceptibility and electrical chemistry of the complexes have been discussed.     

The synthesis and characterization of norbornylsilasesquioxanes

Norbornene reacts with trichlorosilane to generate norbornyltrichlorosilane in high yield. The slow hydrolysis of norbornyltrichlorosilane in acetone yields incompletely condensed norbornyl-silasesquioxanes. The compound C₄₂H₇₀O₁₁Si₆ can be isolated from this reaction. On the basis of elemental analyses, ¹H, ¹³C and ²⁹Si NMR, mass spectroscopy, infrared spectroscopy, and crystallographic analysis, C₄₂H₇₀O₁₁Si₆ is formulated as [(C₇H₁₁)₆Si₆O₇(OH)₄], with the Si₆O₇ framework being composed of two perpendicular Si₄O₄ planes sharing an edge. [(C₇H₁₁)₆Si₆O₇(OH)₄] is a putative model of vicinal [Si(OH)]₂ sites on the surface of partially dehydroxylated silica.     

聚对二亚甲基苯的激光离解质谱分析

聚对二亚甲基苯的激光离解质谱分析高文德，刘维铬，王守文，马洪，敖十庆，邓万卉，许建光（四川联合大学成都６１００６４）崔保顺，唐永建，马宏伟（中国工程物理研究院成都６１０００３）关键词激光，质谱，聚对二亚甲基苯聚对二亚甲基苯难溶于有机溶剂且加热时立即分...     

C2对称的手性双噁唑啉和双噻唑啉的质谱碎裂机理研究

The electron impact mass spectra of ten new C2-symmetric chiral bis(oxazoline) and bis(thiazoline) have been studied. Bis(thiazoline) and bis(oxazoline) possess the same fragmentation mechanism under EI conditions. An unusual fragmentation pathway has been found in the compounds studied. Due to the presence of phenyl group, compounds 6 and 10 undergo a new fragmentation pathway except for the common way as the other eight compounds.Mass analyzed ion kinetic energy spectra experiments and high resolution accurate mass measurement were conducted to confirm the proposed fragmentation pathways.