[1,2,5]thiadiazolo[3,4‐g]quinoxaline acceptor‐based donor–acceptor–donor‐type polymers: Effect of strength and size of donors on the band gap

Electrochromic polymers based on [1,2,5]thiadiazolo[3,4‐g]quinoxaline acceptor and thiophene, 3,4‐ethylenedioxythiophene and 3,3‐didecyl‐3,4‐proylenedioxythiophene donors, namely poly(6,7‐diphenyl‐4,9‐di(thiophen‐2‐yl)‐[1,2,5]thiadiazolo[3,4‐g]quinoxaline) ( P1 ), poly(4‐(2,3‐dihydrothieno[3,4‐b][1,4]dioxin‐5‐yl)‐9‐(2,3‐dihydrothieno[3,4‐b][1,4]dioxin‐7‐yl)‐6,7‐diphenyl‐[1,2,5]thiadiazolo[3,4‐g]quinoxaline) ( P2 ), and poly(4‐(3,3‐didecyl‐3,4‐dihydro‐2H‐thieno[3,4‐b][1,4]dioxepin‐6‐yl)‐9‐(3,3‐didecyl‐3,4‐dihydro‐2H‐thieno[3,4‐b][1,4]dioxepin‐8‐yl)‐6,7‐diphenyl‐[1,2,5]thiadiazolo[3,4‐g]quinoxaline) ( P3 ), respectively, were electrochemically and/or chemically synthesized and characterized. Electrochemical and optical properties of the polymers were then investigated. The results, which were obtained electrochemically and optically, indicate that the polymers bearing the same acceptor and different donor units have a band gap range of 0.59–1.24 eV depending on the strength and size of the donor units and band gap determination method. A significant finding in this study was the phenomenon that when the acceptor is physically huge, the general rule that a weak donor would have a high band gap whereas a strong donor would have low band gap can be broken due to the torsional angles/steric hindrances involved with physically large donor molecules. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55, 3483–3493     

Multicomponent Assembly of Macrocycles and Polymers by Coordination of Pyridyl Ligands to 1,4‐Bis(benzodioxaborole)benzene

Multicomponent reactions between 1,4‐benzenediboronic acid, catechol, and different pyridyl ligands are reported. The condensation of 1,4‐benzenediboronic acid with catechol gives 1,4‐bis(benzodioxaborole)benzene. Upon crystallization, the ester aggregates with the N‐donor ligands through dative B? N bonds. Depending on the nature of the pyridyl ligand, molecularly defined macrocycles or polymeric structures are obtained. 1D polymers are formed with 4,4‐bipyridine and 1,2‐di(4‐pyridyl)ethylene, whereas a 2D network is obtained with the tetradentate ligand tetra(4‐pyridylphenyl)ethylene. These results highlight the utility of dative B? N bonds in structural supramolecular chemistry and crystal engineering.     

Unexpected Cyclization of Dipyridyl-glycoluril in the Presence of Formaldehyde and Strong Acid: A New Scaffold with a Potential as an Anion Receptor

In an attempted synthesis of peripherally pyridine-substituted cucurbituril, an unexpected cyclized product was obtained. A careful NMR analysis followed by mass spectrometry and preliminary crystallographic analyses, helped us in resolving the structure. The structure has two quaternized pyridine functionalities and a groove suitable as a potential receptor site. In addition, just like the parent glycoluril structure, two remaining urea-derived nitrogens can be alkylated by alkyl halides. Thus, we believe this high yielding reaction may become an entry point to a new class of anion receptors.     

Spin-coated copper(I) thiocyanate as a hole transport layer for perovskite solar cells

Journal of Solid State Electrochemistry - Application of a low-cost and efficient p-type inorganic hole-transporting material, copper thiocyanate (CuSCN), on mesoporous n-i-p-configurated...     

The use of a perylenediimide derivative as a dopant in hole transport layer of an organic light emitting device

A perylene diimide (PDI) derivative was used as a dopant in the hole transport layer (HTL) of an organic light emitting device. The HTL examined was poly (N-vinylcarbazole) (PVK) and the PDI used was N,N′-di-dodecylperylene-3,4,9,10-bis-(dicarboximide), (N-DODEPER). The structure of the device was ITO/PEDOT:PSS (70 nm)/PVK:N-DODEPER(0, 0.2, 0.4, 0.8 wt.%) (65 nm)/Alq₃ (35 nm)/LiF (1.3 nm)/Al (100 nm). 0.8 wt.% N-DODEPER presence exhibited a luminous efficiency of 7.87 cd/A and an external quantum efficiency of 0.78% at 21 mA/cm² and a power efficiency of 3l m/W at 12 mA/cm². The luminous and power efficiency values were significantly enhanced by a factor of 15 with respect to that of undoped device.