Triphenylamine-4-boronic Acid

Technical Specifications

Product Description & Scientific Applications

4-(Diphenylamino)phenylboronic acid (triphenylamine-4-boronic acid, 4-DPBA) is an arylboronic acid that installs an electron-rich triphenylamine donor into extended π-conjugated architectures by Suzuki–Miyaura coupling. The triphenylamine moiety is a propeller-shaped donor used in hole-transporting and emissive organic electronic materials; its geometry reduces π-stacking and supports amorphous film formation.

May contain small amounts of the cyclic anhydride 4-(diphenylamino)phenylboroxine. Under aqueous or basic coupling conditions the two forms re-equilibrate and the impact on yield is minor.

Applications and Reactions

Suzuki–Miyaura coupling: couples with aryl and heteroaryl halides under Pd catalysis to give biaryls bearing the triphenylamine donor. The electron-rich diphenylamino group builds extended π-conjugated systems including p-quaterphenyl, oligoarylene, and optoelectronic donor architectures.

End-capping of oligofluorenes for blue OLED / PLED materials: Suzuki coupling at fluorene chain termini installs the diphenylamino group as a hole-transporting end-cap, lowering the first ionisation potential, enhancing thermal stability, and inducing amorphous morphological stability of blue-emitting fluorene oligomers.

Perylene dye functionalisation: Suzuki coupling of multi-brominated perylene monoimide cores gives tri- and tetra-(triphenylamine)-substituted perylene monoimides with broad absorption extending to ~750 nm. The corresponding perylene monoanhydrides serve as light-harvesting sensitisers in dye-sensitised solar cells, the tetra-substituted derivative giving the highest power conversion efficiency in that family.

Solid-state blue emitters with dimesitylboryl acceptors: Suzuki coupling installs the diphenylamino donor onto p-quaterphenyl frameworks bearing a bulky dimesitylboryl acceptor, giving twisted bipolar D–A architectures with intramolecular charge-transfer emission, large Stokes shift, suppressed π-stacking, high thermal stability, and bright blue fluorescence with high solid-state quantum yields.

Multiphoton blue photoluminescence and lasing: diphenylamino end-caps on ladder-type oligo(p-phenylene) scaffolds give strong multiphoton-excited (two- to five-photon) upconverted blue photoluminescence and efficient blue lasing.

Suzuki polycondensation and end-capping for conjugated polymers: as a monofunctional building block or end-capper, it introduces triphenylamine units into conjugated polymer backbones, side chains, or termini. These p-type, hole-transporting polymers are investigated as active or transport layers in OLEDs, OFETs, and bulk-heterojunction organic photovoltaics.

Protodeboronation and condition sensitivity: stability under aqueous-basic conditions depends on substituent, pH, base, concentration, and temperature. For electron-rich triarylamine substrates, conditions and exposure time are matched to the coupling partner; slow-release boron formats suit prolonged aqueous-basic exposure.

Protected boronate ester forms: the pinacol (Bpin) ester is commercially available as an electron-rich protected form for handling and Suzuki–Miyaura coupling. MIDA boronates and potassium organotrifluoroborates are slow-release formats for chromatographic handling, shelf stability, or controlled-release coupling.

Further Reading

For boronic acids, boronic esters, protodeboronation, boroxine content, and Suzuki–Miyaura reagent selection, see NorrChemica's Lab Journal guide: Choosing Your Boron Source for Suzuki–Miyaura Coupling.

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