Triphenylamine derivative

S. Tokito, H. Tanaka, A. Okada, and Y. Taga, High-temperature operation of an electroluminescent device fabricated using a novel triphenylamine derivative, Appl. Phys. Lett., 69 878-880 (1996). 

Scheme 3 Synthetic route to a diethynyl triphenylamine derivative...

Pioneering work on stable doping in organic LEDs has been carried out by the group of K. Leo in Dresden and has been reviewed by Walzer [107]. It is now clear that F4-TCNQ can act as a dopant because its electron affinity is close to 5 eV [110, 111], which is close to the ionization potential of triphenylamine derivatives and to some phthalocyanines (Pc) [107]. It turns out that doping of ZnPc by 2% of F4-TCNQ raises the conductivity to a level of 10 cm When using TCNQ... 

Research Focus Synthesis of poly( fluorene-co-triphenylamine) derivatives as hole transport polymers. 

Observations Two poly(fluorene-co-triphenylamine) derivatives effective as organic... 

The nitration of triphenylamine derivatives by Cu(N03)2 in acetic anhydride at room temperature proceeds readily, introducing up to three nitro groups.22 Reaction... 

Triphenylamine derivatives are known to be efficient hole transport materials and are widely used in organic light-emitting devices. Thelakkat et al. reported the synthesis of a 2,2-bipyridine ligand capped with polyfvinyl-triphenylamine) at both ends.97 The polymer chain was synthesized by the atom transfer radical polymerization of 4-bromostyrene using 4,4-bis (chloromethyl)bipyridine as the initiator (Scheme 18). The bromide groups were then replaced by diphenylamine in the presence of palladium catalyst. Polymer 33 was then obtained by the metalation reaction. 

Suzuki polymerization of 9,9-di-n-octylfluorene-2,7-di(ethyleneborate) diester, (1), with a biphenyl, (II), or triphenylamine derivative, (III), was used by... 

Steric hindrance between phenyl substituents can effectively reduce conjugation. This is most pronounced for triphenylcarbenium ions - like the well-known triphenylmethane dyes (cf. [115]) - and triphenylamine derivatives (cf. [113]). Bridging of phenyl substituents of course alleviates this... 

Aratani et al. (1996) investigated effects of molecular orbital distributions on hole mobilities of a series of triphenylamine derivatives doped into PC. The results show that the HOMO of the triphenylamine derivatives has essentially no effect on either the width of the DOS or the degree of positional disorder, but has a large effect on the prefactor mobility. Aratini et al. argued that increasing the HOMO distribution on the triphenylamine moiety results in an increase in the wavefunction decay constant. The mobility increases as the fraction of the HOMO electron density distributed on the triphenylamine moiety increases. The ionization potential of the triphenylamine derivatives was found to have little effect on the transport behavior. 

The hole-transporting layer contains highly electron-rich aromatic compounds, such as the triphenylamine derivative, /n-MDTA, 11.9, whose role is to provide the required charge transport properties (Figure 11.7). Fluorescent dyes with high quantum yields are used to... 

Intriguingly, the copper-catalyzed C—H arylation of 1/7-indazoles did not yield the desired product and, instead, gave rise to the triphenylamine derivative 29. The authors found that repeating the reaction using palladium and a weaker base (potassium phosphate) gave the desired transformation. Neither the copper nor palladium reactions proceeded with the indazole bearing a free NH (Scheme 7.5). 

Preat J, Michaux C, Jacquemin D, Perpete EA (2009) Enhanced efficiency of organic dye-sensitized solar cells triphenylamine derivatives. J Phys Chem C 113 16821-16833... 

Quantum yields about ten times higher were measured when Wurster s Blue-type radical cations were replaced by those of tri-p-substituted triphenylamines. These radical cations are relatively stable [35]. The following triphenylamine derived radical cations were investigated ... 

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