Phosphorescent Pt^II Systems Featuring Both 2,2′‐Dipyridylamine and 1,3,5‐Triazapentadiene Ligands

Abstract

The treatment of cis- [Pt(dpa)(RCN) 2 ][SO 3 CF 3 ] 2 {dpa = 2,2Јdipyridylamine, R = Me, Et, CH 2 Ph, Ph; [2a-d](OTf) 2 } (OTf = SO 3 CF 3 ) with 2 equiv. of N,NЈ-diphenylguanidine [NH=C-(NHPh) 2 ] in CH 2 Cl 2 solutions at room temp. for 16 h gives [Pt(dpa){NH=C(R)NC(NHPh)=NPh}][SO 3 CF 3 ] {[3a,b,d](OTf)} as the addition products and [Pt(dpa){NH=C(R)NHC(R)= NH}][SO 3 CF 3 ] 2 {[4a,b](OTf) 2 } as the tailoring products. The formulation of complexes [3a,b,d](OTf) and [4a,b](OTf) 2 was supported by satisfactory C, H, and N elemental analyses and agreeable high-resolution ESI-MS, IR, and 1 H (in-[a] Institute

A chelate like no other: exploring the synthesis, coordination chemistry and applications of imidoyl amidine frameworks

“…Moreover, apart from an additional coordination site, the central N-atom can also take part in facile acid/base equilibria, providing pH sensing properties to complexes. 56 This can prove to be important for future application of such complexes that exhibit luminescence properties. In Scheme 16 the ligands that will be discussed in this section are presented.…”

“…In an effort to explore the luminescent properties of asymmetric ImAm ligands with Pt II , Eliseev et al synthesized a series of mononuclear Pt II complexes [Pt II (dpa)(L x )][OTf] (38) (where x = 22, 23, 24; dpa = 2,2 0 -dipyridylamine; OTf = SO 3 CF 3 ). 56 Due to the fact that in all three cationic complexes the ligands act in the same coordination mode and since all three share structural similarities, only 38a will be discussed with L 22 as ligand. As shown in Fig.…”

Platinum(II)‐Mediated Double Coupling of 2,3‐Diphenylmaleimidine with Nitrile Functionalities To Give Annulated Pentaazanonatetraenate (PANT) Systems

“…To the best of our knowledge, the photophysical properties of platinum(II) -diketonates (Figure 1, A) and -diketiminates (B) have not been studied before, but their triaza analogues, namely TAPD platinum(II) complexes (C), exhibit luminescence in the visible region (450-600 nm) with substantial quantum yields (up to 0.74) in the solid state. [15,16,60] Concurrently, platinum(II) phthalocyanines (E), featuring four annulated TAPD systems, demonstrate luminescence from 750 to 900 nm, and this emission is characterized by relatively low quantum yields (0.0017-0.013). [62][63][64][65] 700-800 nm with low quantum yields, are closer to platinum(II) phthalocyanines (E).…”

“…In theory, the empty orbital is subject to coordination by electron donors in CH 2 Cl 2 or other solvents, which would induce dominant nonradiative deactivation pathways especially in the far visible and near infrared region. [60] Alternatively, in the study, the weak emission has been resolved by 532 nm laser excitation coupled with an intensified charge-coupled detector (see Experimental Section). Upon 532 nm excitation, 10, 15, and 18 exhibit weak emission maxima at 732, 740, and 730 nm, respectively ( Figure 3).…”

Gold(I) Complexes [N{(C3F7)C(Dipp)N}2]AuL (L = Ethylene, tert‐Butyl Isocyanide, Tetrahydrothiophene, Triphenylphosphine) and Different Triazapentadienyl Ligand Coordination Modes

“…They have been used very successfully as supporting ligands for most of the metals of the d‐block. 1,3,5‐Triazapentadienyl ligands ( 2 ) are tri‐nitrogen analogues of the 1,5‐diazapentadienyl systems but they have received less attention (Figure ) . We have been interested in the development of this promising class of ligands, in particular the fluorinated ligand versions, and their use in main‐group and transition‐metal chemistry as supporting ligands , , , .…”