Ossila 4,4'-Dibromo-2,2'-bipyridine B1361

4,4'-Dibromo-2,2'-bipyridine (DBrBPy, CAS 18511-71-2) from Ossila is a bipyridyl building block carrying bromine atoms at the 4 and 4' positions of a 2,2'-linked bipyridine. Supplied as a white powder with >98% purity by 1H NMR, it is an electron-deficient compound widely used as a ligand in the preparation of organometallic complexes such as ruthenium (II) photosensitizers.

The compound serves as an intermediate for hole transport materials and photosensitizers in OLED and organic photovoltaic research. In one reported study, a semiconductor combining an electron-withdrawing bipyridine core with triarylamine donor groups acted as an interfacial tunnel between perovskite and the hole transporting layer; the bipyridine core is thought to passivate uncoordinated Pb2+ defects, raising hole mobility from 1.05 × 10-4 to 8.36 × 10-4 cm2 V-1 s-1 and improving both efficiency and stability of n–i–p perovskite solar cells.

Derivatives bearing corannulene groups at the 4,4'-positions have also been explored as molecular tweezers for fullerene recognition, with syn or anti conformations switched through Cu(I) coordination and decoordination.

• Ligand for synthesising organometallic compounds such as ruthenium (II) photosensitizers.
• Building block for hole transport materials used in OLEDs and organic photovoltaics.
• Precursor for bipyridine-cored interfacial materials in n–i–p perovskite solar cells.
• Synthesis of switchable molecular tweezers for fullerene recognition.
• Intermediate for bipyridine-containing polymers and semiconductor materials for OFETs.

• Product code: B1361
• M​olecular Weight: 313.98 g/mol
• Synonyms: 4,4'-Dibromo-2,2'-bipyridyl, DBrBPy
• Melting Point: 138 °C
• Classification / Family: Bipyridine derivatives, Semiconductor synthesis intermediates, OLED, OFETs, organic photovoltaics

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