Original scientific paper

Structural Aspects of Palladium Systems Used as Catalyst Precursors in CO/olefins co- and ter-Polymerisation Reactions

Barbara Milani orcid.org/0000-0002-4466-7566 ; Dipartimento di Scienze Chimiche, Universita di Trieste, Via L. Giorgieri 1, 1-34127 Trieste, ltaly
Giovanni Mestroni ; Dipartimento di Scienze Chimiche, Universita di Trieste, Via L. Giorgieri 1, 1-34127 Trieste, ltaly
Ennio Zangrando orcid.org/0000-0003-1549-4560 ; Dipartimento di Scienze Chimiche, Universita di Trieste, Via L. Giorgieri 1, 1-34127 Trieste, ltaly

Abstract

The synthesis and characterisation of three palladium complexes, involved in the homogeneous catalysis towards the CO-olefins co-and ter-polymerisation reactions, are reported. The [Pd (dpk⋅CH₃OH) (CF₃CO₂)₂] (1), (dpk = di(2-pyridyl) ketone) and [Pd (dppp)(bipy)] [B(C₆F₅)₄]₂ (2), (bipy = 2,2’-bipyridine, dppp = 1,3-bis(diphenylphosphino)propane) compounds are examples of a neutral complex and of a dicationic mixed-ligands one, respectively. The catalytic activity of type 2 complexes was reported to be strongly dependent on the nature of the anion, and the tetra(perfluorophenyl) borate salt represents the best choice to date for the CO/aliphatic olefins copolymerisation. In both structures, the metal has a square planar coordination and the structural aspects of these complexes are discussed in comparison with their catalytic properties. The crystal structure of [Pd(bipy)(naphthoquinone)] (3), which is a putative intermediate of the catalytic cycle, is also reported.

Keywords

palladium; crystal structure; polyketone; chelating ligand; copolymerisation

Hrčak ID:

131960

URI

https://hrcak.srce.hr/131960

Publication date:

1.11.2001.

Visits: 968 *