Helmet Phthalocyaninato Iron Complex as a Primary Drier for Alkyd Paints.

Jan Honzíček,Jaromír Vinklárek,Štěpán Voneš,Eliška Matušková

doi:10.3390/ma14051220

Abstract

This study describes the catalytic performance of an iron(III) complex bearing a phthalocyaninato-like ligand in two solvent-borne and two high-solid alkyd binders. Standardized mechanical tests revealed strong activity, which appeared in particular cases at concentrations about one order of magnitude lower than in the case of cobalt(II) 2-ethylhexanoate, widespread used in paint-producing industry. The effect of the iron(III) compound on autoxidation process, responsible for alkyd curing, was quantified by kinetic measurements by time-resolved infrared spectroscopy and compared with several primary driers. Effect of the drier concentration on coloration of transparent coatings was determined by UV–Vis spectroscopy.

Highlights

Coordination compounds bearing phthalocyanine and phthalocyanine-like ligands represent an important class of transition metal complexes because they are structurally related with naturally occurring porphyrin species
Determination of the catalytic power of Fe-diiPc was examined in solvent-borne (S471 and S622) and high-solid alkyd binders (FP07 and TI870) using standardized mechanical assays on test coatings applied on glass substrates
The collected experimental data were compared with reference data obtained for coatings treated by the commercial primary drier Co-2EH

Summary

Introduction

Coordination compounds bearing phthalocyanine and phthalocyanine-like ligands represent an important class of transition metal complexes because they are structurally related with naturally occurring porphyrin species. In 2006, McGaff et al described an iron(III) complex bearing bicyclic ligand derived from phthalocyanine with a helmet-like structure ([Fe(diiPc)L]; Fe-diiPc, Figure 1a), where diiPc is the formally trianionic 14,28-(1,3-diiminoisoindolinato)phthalocyaninato ligand and L represents the labile axial ligand (e.g., MeOH, H2 O) that completes the coordination sphere of iron. This compound has a unique molecular structure with a non-planar phthalocyanine core, as documented by X-ray diffraction analysis [3]. They include isostructural cobalt(III) compound [Co(diiPc)L] [3] and congeners of Fe-diiPc modified in the ligand periphery [5,6]

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