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Reaction of acetylenic gama-glycols. XXXVII. Dehydroxylation and decarbonylation processes in MS-spectra of sym. aromatic diols without and with halogen substituents in para position of phenyl

Jasiobędzki W., Olejnik M.

Bulletin of the Polish Academy of Sciences. Chemistry

2002

Vol. 50, No. 3

323-334

The electron ionization-induced fragmentation patterns of five diols (with H, F, Cl, Br, I substituents in para positions of phenyls) have been studied, especially the title processes. Alternation of dehydroxylation and decarbonylation processes has been found. The elimination of CO causes a rearrangement of the neighbouring aryl and H. The formation of cumulene ions is possible from M(+*)-H(2)O and M(+*)-H(2)O, X* ions. It has been shown that the acetylenic bond has the ability to hold Ph*", PhX* (X=halogen), CeH4, H. The halogen (type), in comparison with the unsubstituted diol, introduces quantitative and not qualitative changes. With a decrease in the induction effect of the halogen, the relative intensity (%) of fragment ions increases, especially of those having small m/z values.

Effect of confinement to porous glass on structure and optical properties of alkylcyanobiphenyls.

Bezrodnaya T., Gavrilko T., Gnatyuk I., Yaroshchuk O., Puchkovskaya G., Baran J., Ratajczak H., Kukielski J.I.

Optica Applicata

2000

Vol. 30, nr 4

585-590

The 4-n-alkyl-4'-cyanobiphenyls (nCB, n is the number of carbon atoms in alkyl radical n=5, 8) confined to porous glasses with four different mean pore sizes (2, 4, 54 and 90 nm) have been studied. Using FT MIR and NIR spectroscopy methods we have investigated the interaction of nC8 molecules with the pore surface. It has been shown that the interaction is accompanied by the formation of hydrogen bonds between the SiOH group on the glass pore surface and the cyano-group of the nCB monomer. This is demonstrated by the change in the position and shape of CN stretching and Q(C identical to N)+Q(C=C) combination bands in the vibrational spectra of confined nCB depending on pore size and the length of the alkyl tail. To the contrary, in the case of benzophenone confined to PG, weak pi ...OH-Si hydrogen bonds are formed.