Green synthesis and photophysical properties of novel 1 H -imidazo[4,5- f ][1,10]phenanthroline derivatives with blue/cyan two-photon excited fluorescence

Radical-Triggered Chemiluminescence of Phenanthroline Derivatives: An Insight into Radical–Aromatic Interaction

“…As a supplement to CL study, a series of spectral studies were performed to better understand the mechanism of the system. The absorption at ∼285 nm for all compounds − was attributed to the electronic transition from the ground state (π,S o ) to the excited state (π*,S 1 ) of 1,10-phen. , However, the absorption bands at 330 nm of 5-nitro-1,10-phen and 298 of 1,10-phen-5,6-dione can be attributed to the n−π* transition of the oxygen atom . A red shift from 1,10-phen to its electron-donating substituted compound implies that the introduction of an electron donor is beneficial to reducing the absorption energy .…”

“…8,34 However, the absorption bands at 330 nm of 5-nitro-1,10-phen and 298 of 1,10-phen-5,6-dione can be attributed to the n−π* transition of the oxygen atom. 32 A red shift from 1,10-phen to its electron-donating substituted compound implies that the introduction of an electron donor is beneficial to reducing the absorption energy. 32 There was no peak in the visible region of all mixtures, implying that there are no charge-transfer bands (Figure S4).…”

“…32 A red shift from 1,10-phen to its electron-donating substituted compound implies that the introduction of an electron donor is beneficial to reducing the absorption energy. 32 There was no peak in the visible region of all mixtures, implying that there are no charge-transfer bands (Figure S4). Thus, it is clear that 1,10-phen has no complexation, even at different combinations.…”

A fundamental role of the solvent polarity and remote substitution of the 2-(4-R-phenyl)-1H-imidazo[4,5-f][1,10]phenanthroline framework in controlling the ground- and excited-state properties of Re(i) chromophores [ReCl(CO)3(R-C6H4-imphen)]

“…[8][9][10][11][12][13][14] A great advantage of these systems is that they involve a relatively simple synthetic procedure and there is a possibility of introducing all types of substituents into the imidazole ring at the 1H-and C2-positions, including both electron-withdrawing and electron-donating groups, showing different lipophilicities and steric hindrances, directly (via the covalent bond) or through an aryl/heterocycle bridge. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Possessing the 1,10-phenanthroline unit with strong abilities to bind transition metals, imidazo [4,5-f ] [1,10] phenanthrolines have also become very popular ligands for controlling the photophysical and antiproliferative behaviour of transition metal complexes. They have been combined with numerous transition metal ions including Cu(I), [21][22][23][24][25] Cu(II), [26][27][28] Ru(II), [29][30][31][32][33][34][35]<...…”