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greener alternative

≥99% (HPLC)

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2,2′,7,7′- Tetrakis(N,N′-di-p-methylphenylamino)-9,9′-spirobifluorene, 2,2′,7,7′-Tetra(N, N-di-tolyl)amino-spiro-bifluorene, 2,2′,7,7′-Tetra(N,N-di-p-tolyl)amino-9,9-spirobifluorene, 2,2′,7,7′-Tetra(N,N-ditolylL)amino-9,9-spiro-bifluorene, 2,2′,7,7′-Tetrakis(di-p-tolylamino)-9,9′-spirobi[fluorene], 2,2′,7,7′-Tetrakis(di-p-tolylamino)spiro-9,9′-bifluorene, N2,N2,N2′,N2′,N7,N7,N7′,N7-Octa-p-tolyl-9,9′-spirobi[fluorene]-2,2′,7,7′-tetraamine
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
MDL number:


PL:409 nm (in THF)
TGA:> 360 °C (0.5% weight loss)
Tg: 146 °C

Quality Level


≥99% (HPLC)

mol wt

average mol wt 1097.43 g/mol

greener alternative product characteristics

Design for Energy Efficiency
Learn more about the Principles of Green Chemistry.


0.5% TGA, >360°C

transition temp

Tg 146 °C


THF: soluble


385 nm in THF

orbital energy

HOMO 5.2 eV 
LUMO 1.9 eV 

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General description

We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product belongs to enabling category of greener alternatives, and has been enhanced for energy efficiency. Click here for more information.


Spiro-TTB is a high-mobility organic semiconductor with strong donor character given its four substituted arylamine moieties that stabilize positively charged cationic states via mesomeric effects.
It has been successfully applied as transparent hole-transparent layer in solar cells, organic field-effect transistors (OFETs), and organic light emitting devices (OLEDs). In photovoltaics, spiro-TTB was used as organic hole selective layer between perovskite and the silicon cells, contributing to a 25.2% efficency perovskite/ silicon tandem solar cell. When used in OLEDs, spiro-TTB enabled applications in organic photodetectors (OPDs), imaging and lasing applications.
Spiro-TTB is used as a hole transport material in OLED devices, organic photovoltaics (OPVs), organic field-effect transistors (OFETs) and perovskite solar cells. It exhibits excellent hole injection and transport properties, enabling efficient charge transport from the anode to the emitting layers of the OLED structure. This contributes to improved device performance, stability, and overall efficiency.

Storage Class

11 - Combustible Solids




Not applicable


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