Hexadecachloro-substituted lanthanide(III) phthalocyaninates and their hybrid conjugates with gold nanoparticles: Synthesis and optical properties

Octachloro- and Hexadecafluoro-Substituted Lanthanide(III) Phthalocyaninates: Synthesis and Spectral Properties

“…Noteworthy, the best resolved 1 H NMR spectrum of 2b was measured at 60 o C. However, the signal of H Pc protons is shifted upfield to 31.89 ppm comparing to the spectrum, which was measured at 20 o C. In the UV-Vis spectra of lanthanide complexes 2 and 4 two absorption bands are observed: B band (at 350-400 nm) and Q band (at 670-680 nm). As it was shown earlier for other lanthanide monophthalocyaninates, [13,14] the lanthanide ion nature does not influence the Q band position (Table 2).…”

“…In comparison with hexadecachloro-substituted complexes ( Cl16 PcLnOAc), which were described by us earlier, [13] hexadecafluoro-substituted analogs 4a-c possess hypsochromic shift of Q band (Table 2). It can be explained by strong negative inductive effect (I -) of fluorine groups.…”

“…[14,[26][27][28] The fragmentation of axial ligand shows the possibility of the ligand exchange during the formation of hybrid materials or sandwich-type complexes. [13,29] In order to prove the presence of axial acetates and other important structural moieties in target complexes 2 and 4, the FTIR spectra were measured. Stretching vibrations of C-Cl bonds for compounds 2 were observed in the region of 1061-1080 cm 1520-1643 cm -1 were assigned to C-O and C=O vibrations of the acetate groups, respectively (Figure 2).…”

“…[13] In order to reach a better signal resolution in the 1 The presence of a paramagnetic central ion in complexes 2a and 2b results in a downfield shift of the aromatic proton signals comparing to lutetium analog 2c. The most downfield shifted signal of H Pc protons of erbium complex 2c lies at 38.21 ppm.…”

“…Additional advantage of lanthanide phthalocyaninates is the possibility of axial ligand exchange reactions. Using this approach, in our recent publication, [13] the hybrid gold nanoparticles, covered by hexadecachloro-substituted lanthanide phthalocyaninates, were prepared. Increase in reverse saturable absorption effect was observed in hybrid nanoparticles due to their plasmonic properties.…”