2,7-Di(9H-carbazol-9-yl)-9,9'-spirobi[9H-fluorene] TCI D5442

Chemical Identity

Other names: Spiro-2CBP · Spiro-2CBP · 2,7-Bis(9-carbazolyl)-9,9-spirobifluorene
CAS No.: 924899-38-7
PubChem: CID 21032473·SID 468591353
Formula: C49H30N2
Molecular weight: 646.79 g/mol
Purity: >97.0%(HPLC)

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: 9-(7'-carbazol-9-yl-9,9'-spirobi[fluorene]-2'-yl)carbazole
SMILES: C1=CC=C2C(=C1)C3=CC=CC=C3C24C5=C(C=CC(=C5)N6C7=CC=CC=C7C8=CC=CC=C86)C9=C4C=C(C=C9)N1C2=CC=CC=C2C2=CC=CC=C21
InChIKey: UDECBOWBCXTHEY-UHFFFAOYSA-N
MDL: MDL12022464

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TCI D5442, also known as 2,7-Di(9H-carbazol-9-yl)-9,9'-spirobi[9H-fluorene], is an organic material for light-emitting devices built upon a spirobifluorene framework. In this molecule, two fluorene systems are joined through a single shared sp3 carbon atom so that their two planes sit perpendicular to one another, and two carbazole units are then grafted onto the 2 and 7 positions. Compounds of this type are used in the laboratory as complete functional materials within the layers of an OLED device, rather than merely as synthetic precursors, which is why purity and stability become the primary concerns during handling and device fabrication.

The advantages that underpin its selection derive from the spiro architecture. The arrangement of two mutually perpendicular planes prevents the molecules from packing tightly and crystallising, so the thin film that forms tends to remain amorphous and stays homogeneous throughout device operation. The spirobifluorene framework is also recognised for its structural rigidity and good thermal stability, characteristics that matter for a material subjected to heat both during thermal evaporation and while the device is illuminated. The two carbazole units contribute electron-donating character together with hole-transporting capability, while keeping the conjugation from extending excessively because both are connected through the nitrogen atom.

In Indonesian laboratories, materials of this class are typically encountered in university and institutional research groups working on organic electronics, display technology, and solid-state lighting. They are handled in thin-film deposition facilities where the compound is loaded into evaporation sources or dissolved for solution processing, and in synthetic chemistry groups preparing host and charge-transport layers for comparative device studies. Because the material is consumed in small quantities per experiment, it is generally procured in research-scale packs and stored carefully between deposition runs.

TCI brochures (PDF)

Organic Light-Emitting Diode (OLED) Materials 2026-08-18 · p. 3
Carbazoles 2025-06-27 · p. 6
Fluorenes and Fluorenones 2026-04-15 · p. 7

Related TCI products

OLED host material development: the spiro architecture resists crystallisation and the carbazole units supply the donor character commonly sought when building emissive host layers for guest dopants.
Hole-transport layer studies: the two carbazole substituents contribute hole-transporting capability, making this compound a reasonable candidate when researchers compare charge-transport layers in device stacks.
Thin-film morphology research: because the perpendicular spiro geometry discourages tight molecular packing, the material serves well in studies examining amorphous film formation and long-term film homogeneity.
Thermal evaporation process trials: the structural rigidity and thermal stability of the spirobifluorene framework suit it to vacuum deposition experiments where materials must survive sustained heating without decomposition.
Photophysical characterisation work: the controlled conjugation length arising from nitrogen-linked carbazole units makes this molecule useful for absorption and emission measurements on well-defined donor-substituted frameworks.

Brand	TCI (Tokyo Chemical Industry)
CAS number	924899-38-7
Molecular formula	—
Purity	—
Category	Materials Science > Electronic Materials > Organic Light-Emitting Diode (OLED) Materials
Pack sizes	available in research-scale quantities; please confirm the currently offered pack size when ordering
Physical form	—
Storage	keep in a cool, dry place in the tightly closed original container, protected from light

Chemical name: 2,7-Di(9H-carbazol-9-yl)-9,9'-spirobi[9H-fluorene]

Store the container tightly closed in a cool, dry, well-ventilated area away from direct sunlight and sources of heat or ignition. The original supplier packaging, or an equivalent tightly sealed amber glass or opaque container, is appropriate for keeping the material dry and shielded from light. Handle the solid in a fume hood or a well-ventilated workspace, wearing safety glasses, chemical-resistant gloves, and a laboratory coat, and avoid generating or inhaling dust. For OLED-grade materials, minimise exposure to air and moisture during weighing and transfer, reseal the container promptly after use, and consult the manufacturer's safety data sheet before handling or disposal.

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