Synthesis and non-linear optical properties of four polyurethanes containing different chromophore groups

Isomerization and electronic relaxation of azobenzene after being excited to higher electronic states

“…Therefore, choosing the active space becomes a crucial step in the CASSCF calculations. According to the previous calculations on the photoisomerization reaction of azobenzene, the active space including six electrons distributed among six orbitals, referred as to CAS (6,6), can reasonably map the PES of photoisomerization on the ground state and three excited states [45]. In this study, we chose an active space of ten electrons in eight orbitals, namely CAS (10,8), in order to describe more excited states and not heavily increase the calculation workload at the same time.…”

“…Organic or inorganic materials based on the azobenzene (AB) unit have attracted significant attention because of their photoresponsive properties that arise from the reversible cis-trans photoisomerization of AB [1][2][3][4][5][6][7][8][9][10]. Accordingly, the photochemistry and photophysics of AB is again becoming a research focus in recent years [11][12][13][14][15].…”

Atom Transfer Radical Polymerization and Third‐Order Nonlinear Optical Properties of New Azobenzene‐Containing Side‐Chain Polymers

“…Accordingly, there have been increasing researches in azobenzene containing side-chain and main-chain NLO polymers which have the azobenzene groups covalently bonded within the polymers. [11][12][13][14][15][16][17][18][19] We have recently reported [20][21] the synthesis of a new series of azobenzene-containing side-chain polymers by grafting azobenzene compounds to conjugated polymers and by radical polymerization from the monomers of acrylates containing azobenzene group. [22] Recently, more and more copolymers [23][24][25][26] and even few homopolymers, [27] containing azobenzene side chain are synthesized by the atom transfer radical polymerization (ATRP) technique.…”

Nonlinear activity and long-term stability of thin polymer films based on poly(3,5,7,3′,4′-pentahydroxyflavone-8-sulfonic acid) sodium salt

“…The macroscopic second-order susceptibilities ( χ (2) ) (at 1064 nm) in the polymer films were obtained. The former ones were calculated according to the one-dimensional rigid oriented gas model 29 where N is the molecular number density; β is second-order susceptibilities of monomer units on molecular level; F is the local field correction factor; and 〈cos3⁡θ〉 is the average alignment factorΦ is the order parameter characterizing the poling-induced dipole re-orientation of the chromophore moieties.…”