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Linear Phenylsilanes with PSi 4 P, PSi 5 P, and Si 7 Backbones
Author(s) -
Friebel Mike,
Böhme Uwe,
Kroke Edwin
Publication year - 2022
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202200087
Subject(s) - chemistry , steric effects , silicon , silanes , raman spectroscopy , crystallography , molecule , phosphorus , nuclear magnetic resonance spectroscopy , stereochemistry , organic chemistry , physics , silane , optics
Linear α,ω‐diphosphaoligosilanes were prepared starting from 1,5‐dilithiodecaphenyl‐ n ‐pentasilane, Li(SiPh 2 ) 5 Li, and chlorodiorganophosphanes. The compounds 1,5‐bis(diphenylphosphanyl)decaphenyl‐ n ‐pentasilane, (Ph 2 P)Si 5 Ph 10 (PPh 2 ), 1,5‐bis(di‐ iso ‐propylphosphanyl)decaphenyl‐ n ‐pentasilane, ( i Pr 2 P)Si 5 Ph 10 (P i Pr 2 ), and 1,4‐bis(di‐ iso ‐propylphosphanyl)octaphenyl‐ n ‐tetrasilane, ( i Pr 2 P)Si 4 Ph 8 (P i Pr 2 ), were obtained in moderate to good yields and characterized with IR‐, Raman‐, UV‐, 31 P‐, 29 Si‐, and 1 H‐NMR spectroscopy. Single crystal structure analyses of these three silanes show all‐transoid conformations of the atoms along the phosphorus‐silicon backbone of the molecules in the solid state. The silicon‐silicon and the silicon‐phosphorus‐bonds are elongated. This is caused by the complete substitution of these molecules by sterically demanding phenyl‐ and i ‐propyl‐substituents and effective σ‐conjugation along the main chains. Hexadecaphenyl‐ n ‐heptasilane, Si 7 Ph 16 , was prepared for comparison with the other three compounds. The latter one shows a long wavelength UV‐absorption in the same region as 1,5‐bis(diphenylphosphanyl)decaphenyl‐ n ‐pentasilane.