Two kinds of novel phthalocyanines: tetra-azobenzene substituted phthalocyanine (metal free
and with zinc as centric atom) and novel polymeric phthalocyanine carboxyl based on
pentaerythritol framework (with ytterbium and aluminum as centric atoms) have been
synthesized and their electronic adsorption and emission spectrum haven been investigated in
water solution and organic solvent. Both synthesized compounds can emit two fluorescence
peaks when excited at low wavelength (below 400nm) and one emission peak when excited at
long wavelength (higher than 600 nm). For polymeric aluminum phthalocyanine carboxyl, in
pH7.4 buffer solution, when excited at 330nm, beside normal fluorescence peak at 720nm, a
second emission peak appears at 455nm. The emission at 720 nm can be intensified by
addition of hexadecyl trimethyl ammonium bromide (CTAB) while the peak at 455nm does
not. The fluorescence quantum yield of two emission peaks is 0.35 (720nm em, 635nm ex)
and 0.33 (455nm em, 330nm ex), respectively. This equivalent multi-emission phenomenon
by different excited wavelength indicates well applied potential in dual-wavelength
photodynamic diagnose and fluorescence imagination.
Three ytterbium phthalocyanine compounds, ytterbium bis- phthalocyanine (Yb(Pc)2), ytterbium bis- [(tetrakis-
(tertiary-pentyloxy) phthalocyanine)] [Yb(Pc(t-OR5)4)2], bis-ytterbium tris- [(tetrakis- (tertiary-pentyloxy)
phthalocyanine)] [Yb2(Pc(t-OR5)4)3] have been synthesized and characterized by electronic spectrum, MS and element
analysis. The Uv-vis spectrum indicated lower aggregation trend and red shift of Q bands with phthalocyanine ring
increasing from dimer to trimer. The nonlinear optical properties of these compounds in THF solution were investigated
by Z-scan method used 532 nm picosecond laser under open and close aperture condition. Both compounds showed
reverse saturation absorption and nonlinear self-focus refraction effect. The nonlinear absorption and refraction capacity
decreased with the order: Yb2(Pc(t-OR5)4)3 >Yb(Pc(t-OR5)4)2> Yb(Pc)2.
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