Fluorinated Naphthalocyanines Displaying Simultaneous Reverse Saturable Absorption at 532 and 1064 nm

Synthesis and high ranked NLT properties of new sulfonamide-substituted indium phthalocyanines

“…The occurrence of RSA by Pcs 7-9 has three main implications about the nature and the characteristics of their involved excited states: (a) the excited state has a larger absorption cross-section with respect to the ground state S 0 at the wavelength of excitation; (b) their lifetimes s exc fulfil the condition s exc P s p , where s p represents the laser pulse width, and (c) the formation time of their excited states is much shorter than the duration of the laser pulse. Since ns pulses are used, the above considerations confirm that, similar to other indium phthalocyanine-and naphthalocyanine-based systems [26][27][28][29][30][31][32][33][34][35][36][37][38]. RSA of Pcs 7-9 is produced by one-photon absorption from the optically pumped excited triplet state T 1 in a process of sequential multiphoton absorption [51][52][53][54][55].…”

“…5). In the case of 9, F lim is comparable to that of other indium phthalo-and naphthalocyanines with axial halogens [26][27][28][29][30][31][32][33][34][35][36][37][38]. In the case of complex 7, the limiting threshold could not be exactly determined within the experimental range of incident fluences.…”

“…Electron-withdrawing substituents are known to produce an enhancement on the NLT properties of phthalocyanines [35,36]. Taking this in consideration, we idealized the synthesis of three phthalocyanine derivatives bearing eight sulfonamide groups.…”

“…When excited-state absorption occurs from a triplet excited state the related OL effect can be further improved in Pcs through the coordination of heavy central atoms, e.g. Pb [25] or In [26][27][28][29][30][31][32][33][34][35][36][37][38], which accelerate intersystem crossing (ISC) by means of spin-orbit coupling in the excited complex.…”

Synthesis, characterization and third-order nonlinear optical properties of bromo[tri-α-(2,4-dimethyl-3-pentyloxy)subphthalocyanine]boron complex

“…All of the values are comparable to those of the reported good NLO materials. In addition, the effects of cone-shaped molecular structure and axially heavy-atom (Br) substitution on third-order NLO properties are discussed.Organic compounds and organometallic complexes with p-electron delocalization, such as phthalocyanines and related compounds [1][2][3][4][5][6][7], fullerene (C 60 ) and its relatives [8][9][10][11][12], metal clusters and their polymers [13,14], have received significant attention in the last two decades because of their large and fast nonlinear optical response and potential applications in optical communication, data processing, optical switching, optical limiting devices, etc. Current research aims to develop materials with improved/optimized nonlinear optical properties via rational design and synthesis.…”