Structural studies of mesogenic orthopalladated imine derivatives
- Ciriano, M.A. 3
- Espinet, P. 2
- Lalinde, E. 1
- Ros, M.B. 3
- Serrano, J.L. 3
-
1
Universidad de Zaragoza
info
-
2
Universidad de Valladolid
info
-
3
Instituto de Nanociencia y Materiales de Aragón
info
ISSN: 0022-2860
Datum der Publikation: 1989
Ausgabe: 196
Nummer: C
Seiten: 327-341
Art: Artikel
Andere Publikationen in: Journal of Molecular Structure
Zusammenfassung
Structural studies by 1H NMR of 12 orthopalladated complexes of the type: {Pd2(μ-Y)2(C10H21OC6H4C(X)NC6H4R)2} (XH, CH3; YOCOCH3, Cl, Br, SCN; ROC10H21, C10H21) are reported. Although in all cases only the trans isomers of these complexes have been observed, the presence of other types of isomerism has been detected. Thus, the thiocyanate complexes show isomers arising from the relative disposition of the asymmetrical bridging ligands, whereas the acetato-bridged complexes must be a mixture of the D and L enantiomers due to their rigid open-book shape. From the results of different spectroscopic studies (low temperature and selective decoupling) carried out on the ketone-derived imine complex {Pd2(μ-OCOCH3)2(C10H21OC6H4C(CH3)NC6H4C10H21)2} we suggest that a structural distortion due to steric hindrances exists for this compound. © 1989.