Sterically demanding zinc(ii) phthalocyanines: synthesis, optical, electrochemical, nonlinear optical, excited state dynamics studies

Abstract

Sterically hindered molecules like the title compounds, combined with their strong NLO coefficients make them potential candidates for photonic applications.

Greatly enhanced thermo‐oxidative stability of polybenzoxazine thermoset by incorporation of m‐carborane

“…Carborane-containing polymers, such as polyetherketones, polysilanes and polysiloxanes have been prepared as advanced materials with unique thermostabilities. [22][23][24][25][26][27][28][29][30][31][32][33][34] However, to the best of our knowledge, no study of polybenzoxazines based on icosahedral caboranes has been reported. The incorporation of icosahedral carboranes is expected to improve the thermo-oxidative stability of polybenzoxazine.…”

Optoelectronic, femtosecond nonlinear optical properties and excited state dynamics of a triphenyl imidazole induced phthalocyanine derivative

“…59 Our earlier studies on similar molecules demonstrated that the major contribution to the nonlinear absorption when excited with nJ, MHz, 800 nm pulses (from fs oscillator) was from the instantaneous TPA and/or partial contributions from excited state absorption (minimal) and thermal lensing. 39,46 Hence, we performed the NLO studies with a much lower repetition rate (1 kHz, $70 fs, obtained from a fs amplier/optical parametric amplier) laser pulses. Here, we recorded the Z-scan data from the visible to NIR (600 nm to 1.2 mm) wavelength range.…”

“…The NLO studies were performed with 2 ps pulses (800 nm) and 70 fs pulses (690 nm excitation) both at 1 kHz repetition rate to achieve strong 2PA at 82 GW cm À2 for ps pulse regime and strong saturable absorption in fs pulse regime. 39 In both these regimes the molecule essentially demonstrated self-defocusing behavior with n 2 of $10 À17 cm 2 W À1 using fs pulses and $10 À12 cm 2 W À1 using ps pulses. The larger nonlinearity of n 2 for ps regime is due to additional effects other than pure electronic contribution due to longer pulse duration.…”

“…[29][30][31][32][33][34][35] In this regard, our group has also investigated many phthalocyanines to understand the structure and NLO properties correlation for identifying potential molecules for various photonic applications. [36][37][38][39][40][41][42][43][44][45][46][47] over the last few years. To this end our group has been involved in investigating and optimizing the NLO properties of different phthalocyanine, Corrole 37 molecules in the form of thin lms, nanoparticles (NPs) and solutions.…”

Quasiparticle effects on the linear and nonlinear susceptibility of ZnGeP2

“…The relationship between the absorption bands and native defects have been investigated extensively. [8][9][10][11] The effects of a fairly low concentration of impurity on the infrared transmission has been studied combining XPS, electron paramagnetic resonance (EPR) and IR techniques. 10 Extensive EPR studies have identied singly ionized zinc vacancies as the source of a large absorption shoulder, which peaks around 1 mm with a tail extending beyond 2 mm.…”