Visible-emitting Cu(i) complexes with N-functionalized benzotriazole-based ligands

Abstract

Luminescent mono- and dinuclear cationic heteroleptic Cu(I) complexes [Cu(N⁀N’)(P)2]+, [Cu(N⁀N’)(P⁀P)]+ or [Cu2(N⁀N’)2(μ-P⁀P)2]2+ containing bidentate N-donor ligands (N⁀N’) with benzotriazole, pyridine, pyrimidine or substituted triazine moieties in combination with mono- (P)...

Photoactive Copper Complexes: Properties and Applications

“…Upon covalent linking, a greatly enhanced absorption in the visible, a high photostability, and a strong dependency of the excited state lifetimes on the chosen solvent were noted. In addition, a series of luminescent mono- and dinuclear heteroleptic copper­(I) complexes containing bidentate N -donor ligands including a benzotriazole and either a pyridine or a pyrimidine or a substituted triazine in combination with mono- (PPh 3 , P­( i Pr) 3 ) and bidentate (DPEPhos PP 1 , dppe PP 55 ) phosphines have been synthesized and characterized . They displayed marked distortions from the ideal tetrahedral geometry and solid state emission from 538 nm to 637 nm with photoluminescence quantum yields up to 0.92.…”

Synthesis and luminescent properties of three excellent yellow emissive Cu(i) complexes based on the diphosphine ligand and the diimine ligand

“…The bond angles range as follows: P–Cu–P, P–Cu–N, P–Cu–X, X–Cu–N: 111.58(3)°, 108.68(8)–110.97(8)°, 106.24(4)–116.95(4)°, and 101.74(8)° (Table S1†). These values show no significant differences compared to those of the complexes discussed in other articles, 43–49 indicating a distorted tetrahedral geometry around the coordination centers. For complex 3 , as shown in Fig.…”

Substituted Pyrrole‐based Schiff Bases: Effect On The Luminescence Of Neutral Heteroleptic Cu(I) Complexes

“…This outcome can be partly justified considering the energy gap law, i. e. the increase of k nr due to vibrational coupling for longer wavelengths. [46][47][48] In contrast to what is commonly observed in similar Cu(I) complexes, [1,35,44] the use of chelating biphosphines such as DPEphos and Xantphos does not improve the photoluminescent features, presumably because the rigidification of the structure does not compensate the non-radiative processes. Moreover, it is widely recognized that a wide bite angle in the , nm (ɛ/10 4 M À 1 cm À 1 ) λ em [b,c] , nm (n.i.)…”

“…MS (FAB, 3-NBA), m/z (%): 678.09 (11), 677.09 (5), 676.08 (12), 657.12 (6), 645.12 (5), 644.12 (22), 643.12 (55), 642.11 (47), 641.11 (100) [Cu(Xantphos)] + , 627.09 (7), 626.09 (8), 625.08 (8), 307.05 (8) [3-NBA], 191.92 (12), 185.01 (6), 184.00 (6), 182.97 (6), 154.97 (8) [3-NBA], 153.96 (29), 137.97 (10), 136.96 (17), 135.95 (19), 106.94 (5) [3-NBA], 88.90 (5). IR (ATR, v˜) = 3055 (vw), 2964 (vw), 1556 (s), 1509 (w), 1479 (w), 1461 (w), 1432 (s), 1402 (m), 1382 (m), 1292 (s), 1266 (w), 1257 (w), 1239 (vw), 1221 (m), 1208 (w), 1194 (w), 1182 (w), 1170 (w), 1154 (w), 1107 (w), 1093 (w), 1068 (w), 1028 (vs), 997 (vw), 971 (w), 890 (vw), 880 (w), 873 (w), 848 (vw), 825 (w), 814 (w), 798 (w), 778 (w), 745 (s), 731 (vs), 692 (vs), 680 (w), 608 (w), 533 (w), 520 (w), 507 (vs), 495 (m), 488 (m), 478 (w), 458 (m), 447 (w), 424 (m), 418 (w), 412 (w), 404 (w), 401 (w) cm (9), 590.14 (19), 589.13 (52), 588.14 (42), 587.14 (100) [Cu(PPh 3 ) 2 ] + , 564.10 (8), 563.11 (9), 562.10 (12), 327.02 (16), 326.01 (8), 325.02 (40) [Cu(PPh 3 )] + , 307.09 (20) [3-NBA], 289.07 (10), 263.08 (8), 262.07 (18), 239.05 (7), 238.05 (5), 185.01 (5), 182.99 (14), 155.03 (16), 154.02 (54) [3-NBA], 152.03 (5), 139.03 (7), 138.03 (18), 137.02 (32) [3-NBA], 136.01 (35), 120.02 (5), 107.02 (11), 91.01 (7), 90.00 (6), 88.98…”

“…[21][22][23][24][25][26] Hence, neutral Schiff bases were successfully employed for the preparation of photoactive cationic Cu(I) complexes. [27][28][29] Given our interest in luminescent Cu(I) derivatives, [30][31][32][33][34][35][36][37] we deemed it interesting to investigate the effect of substituted pyrrole-based Schiff bases in the photophysical properties of the derived complexes. The use of imines as chelating N-donors for Cu(I) was previously described by Eisenberg's group.…”