ISSN:
0009-2940
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Transition Metal Complexes of N-Containing Ligands, XII. Ligand Properties of Cyclic Azo Compounds and 1,2-Diazines in Carbonylmetal ComplexesThe donor-acceptor properties of 2,3-diazabicyclo[2.2.1]hept-2-ene (az, a), benzo[c]cinnoline (bnc, b), phthalazine (phz, c), and pyridazine (pdz, d) are compared on the basis of both the cyclopentadienyl-dicarbonylmanganese complexes CpMn(CO)2L (L = a-d) and the arene-dicarbonylchromium complexes ArCr(CO)2L (L = a, c, d; Ar = benzene or derivatives of benzene). According to the 1H NMR spectra of the complexes the ligands L = a, c, d are unsymmetrically coordinated by the lone pair of electrons of one of the nitrogen atoms. While the photolysis of CpMn(CO)3 (1) in the presence of benzo[c]cinnoline (b) leads to CpMn(CO)2(bnc) (1b), the corresponding photoreaction of ArCr(CO)3 (2-7) results in loss of the arene ring and formation of the pentacarbonylchromium complex Cr(CO)5(bnc).
Notes:
Die Donator-Akzeptor-Eigenschaften von 2,3-Diazabicyclo[2.2.1]hept-2-en (az, a), Benzo[c]cinnolin (bnc, b), Phthalazin (phz, c) und Pyridazin (pdz, d) werden anhand der Cyclopentadienyldicarbonylmangan-Komplexe CpMn(CO)2L (L = a-d) und der Aromat-dicarbonylchrom-Komplexe ArCr(CO)2L (L = a, c, d; Ar = Benzol oder Benzolderivate) verglichen. Nach den 1H-NMR-Spektren der Komplexe sind die Liganden L = a, c, d in allen Fällen unsymmetrisch über das freie Elektronenpaar eines der beiden N-Atome koordiniert. Während die Photolyse von CpMn(CO)3 (1) in Gegenwart von Benzo[c]cinnolin (b) zu CpMn(CO)2(bnc) (1b) führt, entsteht bei der analogen Photoreaktion mit ArCr(CO)3 (2-7) unter Abspaltung des Sechsrings Ar der Pentacarbonylchrom-Komplex Cr(CO)5(bnc).
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19771101006
Permalink
