Novel 4-(tert-butyl)phenyl-substituted lanthanide(III) tetrapyrazinoporphyrazines: synthesis, optical properties and formation of hybrid blends with Au nanoparticles

Abstract Novel terbium(III), dysprosium(III), erbium(III) and lutetium (III) tetrapyrazinoporphyrazines with bulky 4-(tert-butyl)-phenyl groups, were obtained by metallation of porphyrazine ligand in high yields. The target complexes were identified by high-resolution matrix assisted laser desorption/ionization mass spectrometry, infrared and nuclear magnetic resonance spectroscopy. In nuclear magnetic resonance spectra, the proton signals demonstrate strong shifts for complexes with paramagnetic ions in comparison with lutetium one. The impact of peripheral (tert-butyl)phenyl groups and central ion nature on position of the main absorption bands in UV–Vis spectra was investigated. Two blends of gold nanoparticles (5 and 60 nm in diameters) and lutetium complex were prepared. The influence of the size of bare Au nanoparticles on core-shell structure of hybrid blends was investigated by transmission electron microscopy and atomic force microscopy. The nonlinear optical behavior of hybrid nanoparticles as well as initial lutetium (III) tetrapyrazinoporphyrazine was carried out using Z-scan measurements.