A thiazolo[5,4-]thiazole-bridged porphyrin organic framework as a promising nonlinear optical material

Porphyrin-based porous organic frameworks are an important group of materials gaining interest due to their structural diversity and distinct opto-electronic properties. However, these materials are seldom explored for nonlinear optical (NLO) applications. In this work, we investigate a thiazolo[5,4- d ]thiazole-bridged porous, porphyrin framework (Por-TzTz-POF) with promising NLO properties. The planar TzTz moiety coupled with integrated porphyrin units enables efficient -conjugation and charge distribution in the Por-TzTz-POF resulting in a high nonlinear absorption coefficient ( = 1100 cm GW 1 ) with figure of merit (FoM) 1 / 0 = 5571, in contrast to analogous molecules and material counterparts e.g. metalorganic frameworks (MOFs; = 0.30.5 cm GW 1 ), molecular porphyrins ( = 100400 cm GW 1 ), graphene ( = 900 cm GW 1 ), and covalent organic frameworks (Por-COF-HH ; = 1040 cm GW 1 and FoM = 3534). We report a porous thiazolo[5,4- d ]thiazole-bridged porphyrin organic framework, Por-TzTz-POF, with promising nonlinear optical (NLO) activity.