Holmium phthalocyanine

In this chapter, a correlation between the ionic radius of the metal-complexing in double-decker phthalocyanines and positions of maxima Q-bands in the electronic absorption spectra were determined in dimethylformamide and chloroform. The increasing of ionic radius from holmium to lutetium caused a regular change in the position of the maxima Q-bands in the absorption spectra. The behavior of metal diphthalocyaninates in supramolecular systems was also investigated. It was revealed that a new band shifted to the red region appeared in absorption spectra of sandwich phthalocyaninates of lutetium, etbium and ytteibium in albumin solution. This particular behavior allows us to consider phthalocyanines as prototype of sensitive biosensor system. 

The objects of study were double-decker phthalocyanine lanthanide complexes with the lutetium (Lu), ytteibium (Yb), holmium (Ho) and erbium (Er) as metal-... 

FIGURE 9.1 Electronic spectra of double-decker complexes bis-phthalocyanines lutetium, ytterbium, erbium and holmium in CHC13. 

In the transition from lutetium bis-phthalocyanine complex to complex with holmium light bathochromic effect is observed, in accordance with the change in the radius of the metal-complexing agent. 

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