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Formation and reactivity of yttrium—carbon cluster ions in the gas phase: Y 4 C + 7–9 and Y 3 C + 7,8
Author(s) -
Kan Steven Z.,
Lee Samuel A.,
Freiser Ben S.
Publication year - 1996
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/(sici)1096-9888(199601)31:1<62::aid-jms261>3.0.co;2-j
Subject(s) - chemistry , yttrium , fourier transform ion cyclotron resonance , mass spectrum , ion , carbon fibers , fragmentation (computing) , dissociation (chemistry) , inorganic chemistry , analytical chemistry (journal) , oxide , organic chemistry , materials science , composite number , computer science , composite material , operating system
The formation of yttrium—carbon cluster ions and their reactivities toward CH 3 Br, H 2 O and NH 3 were examined by using a Fourier transform ion cyclotron resonance mass spectrometer equipped with a Smalley supersonic expansion ion source. A broad range of yttrium— carbon cluster ions can be generated. Unlike other metal—carbon systems, such as titanium—carbon and vanadium—carbon where M 8 C + 12 (termed metallo‐carbohedrene) species show ‘magic’ character in the mass spectra in that their intensities dominate neighboring peaks, Y 8 C + 12 is not observed to be the most abundant Y 8 C x + ion. One peak that stands out as being relatively intense under various conditions is Y 4 C + 7 . The collision‐induced dissociation and reactivity of this ion were therefore chosen for study and compared with those of Y 4 C + 8,9 and Y 3 C + 7,8 to see the effect of added yttrium and carbon. The major fragmentation pattern of Y 3 C + x and Y 4 C + x species is via loss of metal. YC 2 + and Y 2 C x + ( x = 4, 5) are also produced. Unlike the metal—carbon cluster ions, Nb 4 C 4 + , M 8 C + 12 (M = V, Ti and Nb) and V 14 C + 12,13 studied previously, simple attachment reactions with small neutral molecules such as H 2 O and NH 3 were not observed. Instead, Y 4 C 7 + dehydrogenates H 2 O and NH 3 , while Y 3 C + 7,8 react with H 2 O in a sequential fashion to yield yttrium—oxide cluster ions and neutral acetylene. Y 4 C + 7–9 ions abstract bromine from CH 3 Br. This reaction is believed to result from the odd number of electrons in these cluster ions, in which a single electron can pair with that of Br to form a σ bond. Supporting this are the reactions of the even‐electron species Y 3 C + 7,8 with CH 3 Br, where bromine abstraction does not occur.