Product: Por-COF (Also known as COF-420, Por-C=N-COF, or Por-COF-HH)
Synonyms: COF-420, Por-C=N-COF, Por-COF-HH
CAS: Not mentioned
Basic Information
| Unit MF. | Not mentioned | Unit MW. | Not mentioned | ||
| Coordination Metal | Not mentioned (Zn, Cu in Por-COF-ZnCu; Zn, Ni in Por-COF-ZnNi) | Linkers |
5,10,15,20-Tetrakis(4-aminophenyl)-21H,23H-porphyrin (TAPP), 5,10,15,20-Tetrakis(4-formylphenyl)-21H,23H-porphyrin (TFPP) |
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| Pore Size | Approximately 1.4 nm (calculated value); about 1.5 nm (observed by TEM, close to the calculated value); 1.0 - 1.3 nm (calculated from N₂ adsorption data, with slightly different values by different methods) | Pore volume | Not mentioned | ||
| Surface Area | 1316 m²/g (Por-COF-HH, calculated by BET model from N₂ adsorption data); 1027 m²/g (Por-COF-ZnCu, calculated by BET model from N₂ adsorption data); 551 m²/g (Por-COF-ZnNi, calculated by BET model from N₂ adsorption data) | ||||
| Analog Structure | Not mentioned | ||||
Product Property
| Appearance | Color not clearly mentioned in the text. TEM images show well - defined square - shaped crystallites, and SEM images show cubic - shaped crystals | |||
| Particle Size | The crystallite sizes of Por-COF-HH and Por-COF-ZnNi are close to 100 nm, while that of Por-COF-ZnCu is about 50 nm | |||
Stability
1) Stability in solution is not mentioned.
2) Thermal stability was studied by thermogravimetric analysis (TGA) in N₂ and air, but specific stability levels and decomposition temperature data were not given.
2) Thermal stability was studied by thermogravimetric analysis (TGA) in N₂ and air, but specific stability levels and decomposition temperature data were not given.
Preservation
1) Store in a dry and cool place, sealed.
2) It is recommended to activate in a vacuum oven at room temperature for 3 hours before use.
Other Features
1) Fluorescence: Por-COF-HH has a reasonable emission at 650 nm, and its excited - state lifetime τavg = 9.17 ns (measured in 2 - propanol dispersion state). Por-COF-ZnCu and Por-COF-ZnNi show photoluminescence quenching.
2) Nonlinear optical properties: These Por-COFs exhibit optical switching behavior. With the increase of input laser intensity, the nonlinear absorption changes from saturable absorption (SA) to reverse saturable absorption (RSA). Metalated Por-COFs (Por-COF-ZnCu and Por-COF-ZnNi) show high nonlinear absorption coefficient values (β≈4500 cm/GW). Specifically, β = 4470 cm/GW for Por-COF-ZnCu and β = 4170 cm/GW for Por-COF-ZnNi, and they also have high figure - of - merit (FOM) values. The FOM of Por-COF-ZnCu is 3565, and that of Por-COF-ZnNi is 3762, which are better than many other materials such as molecular porphyrins, metal - organic frameworks, and graphene. The β of Por-COF-HH is 1040 cm/GW, and its FOM is 3534.
2) Nonlinear optical properties: These Por-COFs exhibit optical switching behavior. With the increase of input laser intensity, the nonlinear absorption changes from saturable absorption (SA) to reverse saturable absorption (RSA). Metalated Por-COFs (Por-COF-ZnCu and Por-COF-ZnNi) show high nonlinear absorption coefficient values (β≈4500 cm/GW). Specifically, β = 4470 cm/GW for Por-COF-ZnCu and β = 4170 cm/GW for Por-COF-ZnNi, and they also have high figure - of - merit (FOM) values. The FOM of Por-COF-ZnCu is 3565, and that of Por-COF-ZnNi is 3762, which are better than many other materials such as molecular porphyrins, metal - organic frameworks, and graphene. The β of Por-COF-HH is 1040 cm/GW, and its FOM is 3534.
Applications
1) Used in optical switching devices, taking advantage of their optical switching behavior from SA to RSA.
2) Potentially applicable in optical limiting devices due to the high nonlinear absorption coefficient of metalated Por-COFs.
2) Potentially applicable in optical limiting devices due to the high nonlinear absorption coefficient of metalated Por-COFs.
Characterizations
References
1) Biswal, Bishnu P.; Valligatla, Sreeramulu; Wang, Mingchao; Banerjee, Tanmay; Saad, Nabil A.; Mariserla, Bala Murali Krishna; Chandrasekhar, Naisa; Becker, Daniel; Addicoat, Matthew; Senkovska, Irena; Berger, Reinhard; Rao, D. Narayana; Kaskel, Stefan; Feng, Xinliang. Angewandte Chemie International Edition, 2019, 58(23), 6896 - 6900, DOI: 10.1002/anie.201814412; Nonlinear Optical Switching in Regioregular Porphyrin Covalent Organic Frameworks
2) Samal, Mahalaxmi; Valligatla, Sreeramulu; Saad, Nabil A.; Rao, D. Narayana; Sahu, Rojalin; Rao, M. Veeramohan; Biswal, Bishnu P. Chemical Communications, 2019, 55(79), 11025 - 11028, DOI: 10.1039/c9cc05415d; A thiazolo[5,4 - d]thiazole - bridged porphyrin organic framework as a promising nonlinear optical material
