Organometallic Polymer Light‐Emitting Diodes Derived from a Platinum(II) Polyyne Containing the Bithiazole Ring

The synthesis, thermal, and photoluminescence properties of novel platinum metallopolyynes of bithiazole derivatives trans ‐[Pt(PR 3 ) 2 ‐C≡C‐Ar‐C≡C] n (Ar = 4,4′‐dibutyl‐2,2′‐bithiazole‐5,5′‐diyl P1 ; 4,4′‐dinonyl‐2,2′‐bithiazole‐5,5′‐diyl P2 ) and their molecular model complexes are described. The structural properties of the dinuclear model compound for P1 have been examined by X‐ray crystallography. In view of the electron‐donating and electron‐withdrawing nature of the thiazole rings in the main chain, a strong π ‐conjugated system that features unique donor–acceptor interactions is created, which results in optical bandgaps of 2.40 eV. The optical gap of the polymer is notably reduced as compared to that for the more electron‐rich bithienyl analogue. Multi‐layer polymer light‐emitting diodes have been fabricated with the metallopolymer as the emitting layer, which give a green light color with the Commission Internationale de L'Eclairage (CIE) chromaticity coordinates of (0.26, 0.58) at 8 V. magnified image