Photonic crystals(PCs)exhibit promising structural coloration properties and possess extensive application prospects in diverse optical fields.However,state-of-the-art inorganic or polymeric PCs show limited adaptivit...Photonic crystals(PCs)exhibit promising structural coloration properties and possess extensive application prospects in diverse optical fields.However,state-of-the-art inorganic or polymeric PCs show limited adaptivity as their configurations are fixed once formed.Herein,bio-organic adaptive PCs are fabricated via drop-casting of amphiphilic guanine-based peptide nucleic acid selfassembled microspheres.The high formation activation energy of up to 81.8 kJ·mol−1 suggests that the self-assembly step dominates the entire process.Therefore,the configurations along with the structural coloration of the supramolecular PCs are sensitive to self-assembly influencing parameters,showing temperature-encoded structural color evolution and solvent polaritydependent solvatochromism.Our findings demonstrate that the supramolecular PCs are adaptive,thus showing promising potential for detection of organic solvents of different polarities in a visual and real-time manner for environmental protection or optical applications.展开更多
Two new mixed ligand ruthenium(II) complexes, Ru(dcbpy)^(LL)(NCS) 2 [where dcbpy=4,4′ dicarboxyl 2,2′ bipyridine, LL=4,4′ bis( N methyl anilinomethyl) 2,2′ bipyridine (1) or 4 methyl 4′ N met...Two new mixed ligand ruthenium(II) complexes, Ru(dcbpy)^(LL)(NCS) 2 [where dcbpy=4,4′ dicarboxyl 2,2′ bipyridine, LL=4,4′ bis( N methyl anilinomethyl) 2,2′ bipyridine (1) or 4 methyl 4′ N methyl anilinomethyl 2,2′ bipyridine (2)], were synthesized, and the photophysical properties of these complexes were studied. The metal to ligand charge transfer (MLCT) transitions of these complexes exhibited solvatochromic effect due to the existence of NCS ligands. The MLCT energies also strongly depend on the pH values of the solutions because of protonation and deprotonation of the carboxyl groups. The p K a values of the ground state, 4 0 for 1 and 3 8 for 2, were obtained from the titration curves. The photoelectrochemical properties of 1 and 2 as sensitizers in sandwich type solar cells have been studied. Complex 1 exhibited better photoelectrochemical behavior than complex 2 as expected. It was proved that the design of mixed ligand complex by introducing electron donating group in one of the ligands should be a promising approach.展开更多
基金the National Key Research and Development Program of China(No.2022YFE0100800)the National Natural Science Foundation of China(No.52175551)。
文摘Photonic crystals(PCs)exhibit promising structural coloration properties and possess extensive application prospects in diverse optical fields.However,state-of-the-art inorganic or polymeric PCs show limited adaptivity as their configurations are fixed once formed.Herein,bio-organic adaptive PCs are fabricated via drop-casting of amphiphilic guanine-based peptide nucleic acid selfassembled microspheres.The high formation activation energy of up to 81.8 kJ·mol−1 suggests that the self-assembly step dominates the entire process.Therefore,the configurations along with the structural coloration of the supramolecular PCs are sensitive to self-assembly influencing parameters,showing temperature-encoded structural color evolution and solvent polaritydependent solvatochromism.Our findings demonstrate that the supramolecular PCs are adaptive,thus showing promising potential for detection of organic solvents of different polarities in a visual and real-time manner for environmental protection or optical applications.
文摘Two new mixed ligand ruthenium(II) complexes, Ru(dcbpy)^(LL)(NCS) 2 [where dcbpy=4,4′ dicarboxyl 2,2′ bipyridine, LL=4,4′ bis( N methyl anilinomethyl) 2,2′ bipyridine (1) or 4 methyl 4′ N methyl anilinomethyl 2,2′ bipyridine (2)], were synthesized, and the photophysical properties of these complexes were studied. The metal to ligand charge transfer (MLCT) transitions of these complexes exhibited solvatochromic effect due to the existence of NCS ligands. The MLCT energies also strongly depend on the pH values of the solutions because of protonation and deprotonation of the carboxyl groups. The p K a values of the ground state, 4 0 for 1 and 3 8 for 2, were obtained from the titration curves. The photoelectrochemical properties of 1 and 2 as sensitizers in sandwich type solar cells have been studied. Complex 1 exhibited better photoelectrochemical behavior than complex 2 as expected. It was proved that the design of mixed ligand complex by introducing electron donating group in one of the ligands should be a promising approach.
