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。     

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.     

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: 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.