ISSN:
0009-2940
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Photoelectron Spectroscopic Investigations on Boron Compounds, II. Five-membered Heterocycles of BoronThe He(I) photoelectron (P.e.)spectra of 30 derivatives of the isoelectronic 6π-electron five-membered ring compounds 1-7 containing boron with the nitrogen substituents R — H, CH3. C(CH3)3, Si(CH3)3, Sn(CH3)3, B[N(CH3)2]2 P(CH3)2, P[N(CH3)2]2. As(CH3)2 R′ — CH3, and the boron substituents Z — H. CH3 CI, Br, SCH3, OCH3 and N(CH3)2 show a cyclic π-conjugation of the ring compounds, which decreases on successive exchange of ring nitrogen atoms for ring sulfur atoms. - 11B chemical shifts follow a linear correlation with calculated π-charge densities and ππ*-orbital energy differences of the CNDO/S model as well as vertical ionization energies of the first p.e. bands.
Notes:
Die He(I)-Photoelektronen(PE)-Spektren von 30 Derivaten der isoelektronischen 6π-Elektronen-Fünfringsysteme des Bors 1-7 mit Stickstoffsubstituenten R — H, CH3. C(CH3)3, Si(CH3)3, Sn(CH3)3, B[N(CH3)2]2 P(CH3)2, P[N(CH3)2]2. As(CH3)2 R′ — CH3, und Borsubstituenten Z = H, CH3 Cl, Br, SCH3, OCH3 und N(CH3)2 lassen eine cyclische π-Konjugation im Ringgerüst erkennen. die bei sukzessivem Austausch von Ring-Stickstoff- gegen Ring-Schwefelatome abnimmt. - Chemische Verschiebungen der 11B-Kernresonanzsignale sind mit berechneten π-Ladungsdichten und ππ*-Orbitalenergiedifferenzen des CNDO/S-Modells sowie mit vertikalen Ionisierungsenergien der ersten PE-Banden linear korrelierbar.
Additional Material:
8 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19751081215
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