Syntheses, Structures, FAB Mass Spectra, and Magnetic Properties of Chromium Chalcogenide Cluster Complexes [Cr6Se8(PEt3)6], [Cr6Se8(H)(PEt3)6], and [Cr6S8(H)(PEt3)6]

1998 ◽  
Vol 37 (26) ◽  
pp. 6852-6857 ◽  
Author(s):  
Satoshi Kamiguchi ◽  
Hideo Imoto ◽  
Taro Saito ◽  
Teiji Chihara
Keyword(s):  
Magnetic Properties ◽  
Mass Spectra ◽  
Cluster Complexes ◽  
Fab Mass Spectra

Fast Atom Bombardment Mass Spectrometry of the Vitamin B12 Analogues Hydrogenobalamin and Cupribalamin

1984 ◽  
Vol 39 (2) ◽  
pp. 248-251 ◽  
Author(s):  
Lutz Grotjahn ◽  
Volker B. Koppenhagen ◽  
Ludger Ernst
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrum ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Metal Clusters ◽  
Cobalt Atom ◽  
Vitamin B ◽  
Metal Free ◽  
Characteristic Fragment ◽  
Fab Mass Spectra

Hydrogenobalam in (metal-free vitamin B12) and cupribalamin are characterized by their fast atom bombardment (FAB) mass spectra which show molecular ion and characteristic fragment ion peaks. These spectra and the high-resolution FAB mass spectrum of cobalamin (vitamin B12) show that the (M+H)+-CN-59 peak for the latter is due to loss of acetamide and not of the central cobalt atom. In the FAB mass spectrum of cupribalamin metal clusters are observed

Nucleophilic Aromatic Substitution with 2,3-Dihydro-1,3-diisopropyl- 4,5-dimethylimidazol-2-ylidene

2009 ◽  
Vol 64 (10) ◽  
pp. 1176-1182 ◽  
Author(s):  
Eyad Mallah ◽  
Norbert Kuhn ◽  
Cäcilia Maichle-Mößmer ◽  
Manfred Steimann ◽  
Markus Ströbele ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Boron Trifluoride ◽  
Mass Spectra ◽  
Nucleophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Preparative Scale ◽  
Fab Mass Spectra

2,3-Dihydro-1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (1) reacts with an excess of hexafluorobenzene in the presence of boron trifluoride diethyletherate to give 1,3-diisopropyl-4,5- dimethyl-2-(perfluorophenyl)imidazolium tetrafluoroborate (2). Solutions of 2 exhibit an equilibrium consisting also of hexafluorobenzene and 2,2ʹ-(perfluoro-1,4-phenylene)bis(1,3-diisopropyl- 4,5-dimethylimidazolium)bis(tetrafluoroborate) (3) which is obtained from 1 and hexafluorobenzene in the ratio 2 : 1 on a preparative scale. Similar to 2, 2-(4-cyano-2,3,5,6-tetrafluorophenyl)-1,3- diisopropyl-4,5-dimethylimidazolium tetrafluoroborate (4), 2-(2,4-dicyano-2,5,6-trifluorophenyl)- 1,3-diisopropyl-4,5-dimethylimidazolium tetrafluoroborate (5), and 2-(4,6-difluoro-1,3,5-triazin-2- yl)-1,3-diisopropyl-4,5-dimethylimidazolium tetrafluoroborate (6) are obtained from 1 and perfluorobenzonitrile, 1,3-dicyano-2,4,5,6-tetrafluorobenzene, and 2,4,6-trifluoro-1,3,5-triazin, respectively. The FAB mass spectra of compounds 2 - 6 and the results of the crystal structure analyses of compounds 2 - 4 are discussed.

scholarly journals Synthesis of Triphenyltin (IV) and Dibutyltin (IV) Complexes of 1-Aryl-2,5-dithiohydrazodicarbonamides and Their Characterization

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Rashmi B. Rastogi ◽  
Karuna Singh ◽  
Vinay Jaiswal
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Infrared Spectra ◽  
Mass Spectra ◽  
Molar Conductance ◽  
Fab Mass Spectra ◽  
Nuclear Magnetic

Organotin complexes of the types Ph3SnL and Bu2SnL [where Ph = phenyl and Bu = butyl; HL = 1-phenyl-2,5-dithiohydrazodicarbonamide (HPhthc), 1-benzyl-2,5-dithiohydrazodicarbonamide (Hbzthc), 1-(4-ethoxyphenyl)-2,5-dithiohydrazodicarbonamide (HEtOPhthc)] have been prepared. Molar conductance studies demonstrate the nonionic behavior of the complexes. The 1H and 13C nuclear magnetic resonance and FAB mass spectra of the complexes are consistent with the proposed stoichiometry. Infrared spectra suggest an anionic bidentate coordinating behavior of the ligands.

Structure of Dimeric Compounds Obtained from 3β-Acetoxy-21,22-dioxo-18α,19βH-ursan-28,20β-olide

1993 ◽  
Vol 58 (7) ◽  
pp. 1675-1691 ◽  
Author(s):  
Eva Klinotová ◽  
Jiří Klinot ◽  
Václav Křeček ◽  
Stanislav Hilgard ◽  
Miloš Buděšínský ◽  
...  
Keyword(s):  
Silica Gel ◽  
Mass Spectra ◽  
Fab Mass Spectra ◽  
C Nmr

The triterpenoid α-diketone with oxabicyclo[2.2.2]octane system in the ring E (3β-acetoxy-21,22-dioxo-18α,19βH-ursan-28,20β-olide (I)) gives isopropylidenedioxy derivative II and dimeric compounds V and IX when submitted to chromatography on silica gel in the presence of acetone. Compounds V and IX were reduced with hydride to hydroxy derivatives VI, X, and XI; on reaction with diazomethane they gave dimeric compounds with spiroepoxide group at the position 21 (compound VII) or 22 (compound XII) which reacted further with diazomethane to give monomeric spiroepoxides VIII, XIII, and XIV. The structure of the compounds obtained was derived from their 1H and 13C NMR, IR, and FAB mass spectra.

New cluster ions in the FD- and FAB-mass spectra of π-allylpalladium chloride complexes

1990 ◽  
Vol 385 (1) ◽  
pp. C17-C20 ◽  
Author(s):  
C.Akira Horiuchi ◽  
Eiichi Miki ◽  
Takeo Takada ◽  
J.Yasuo Satoh ◽  
Mikio Tanaka ◽  
...  
Keyword(s):  
Mass Spectra ◽  
Cluster Ions ◽  
Chloride Complexes ◽  
Fab Mass Spectra

scholarly journals Synthesis, Spectroscopic, and Antimicrobial Studies of Binuclear Metallocene (M = Ti, Zr, or Hf) Derivatives of Bis(mercaptoazoles)

2007 ◽  
Vol 2007 ◽  
pp. 1-9 ◽  
Author(s):  
Shilpi Sinha ◽  
Akhilesh Kumar Srivastava ◽  
Chandra Mohan Tripathi ◽  
Om Prakash Pandey ◽  
Soumitra Kumar Sengupta
Keyword(s):  
Mass Spectra ◽  
Electrical Conductance ◽  
Molar Ratio ◽  
Binuclear Complexes ◽  
Reaction Products ◽  
Bacterial Strains ◽  
Antimicrobial Studies ◽  
Derivatives Of ◽  
Fab Mass Spectra ◽  
Growth Inhibiting

The reactions of(η5−C5H5)2MCl2(M = Ti, Zr, or Hf) with mercaptoazoles(LH2), namely, bis(mercaptotriazoles), bis(mercap-tooxadiazoles), and bis(mercaptothiadiazoles) in 2 : 1 molar ratio, respectively, have been studied in dry tetrahydrofuran in the presence ofn-butylamine and the binuclear complexes of the type[{(η−C5H5)2M}2(L)](M = Ti/Zr/Hf) are obtained. Tentative structural conclusions are drawn for the reaction products based upon elemental analysis, electrical conductance, magnetic moment, and spectral data (UV-Vis, IR,H1NMR, andC13NMR). FAB-mass spectra of few complexes of each series were also carried out to confirm the binuclear structures. Studies were conducted to assess the growth-inhibiting potential of the complexes synthesized, and the ligands against various fungal and bacterial strains.

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