4,4′−Dipyridyl
4,4′-Dipyridyl (CAS 553-26-4), with the molecular formula C10H8N2 and a molecular weight of 156.18 g/mol, is a versatile organic compound. It is primarily utilised in materials science, particularly in the development of organic and printed electronics. Its applications extend to the synthesis of photochromic and thermochromic dyes, as well as in photonic and optical materials.
- IUPAC
- 4,4′-Bipyridine,4,4′-Bipyridyl
- Synonyms
- 4,4′-Bipyridine4,4′-Bipyridyl

Organic and Printed Electronics
Utilised as a building block or component in the synthesis of advanced organic electronic materials, contributing to semiconductor and conductive polymer research.
Photochromic and Thermochromic Materials
Serves as a precursor or functional component in the creation of dyes that exhibit reversible colour changes in response to light or temperature.
Photonic and Optical Applications
Incorporated into materials designed for light manipulation, potentially for use in optical devices, sensors, or energy conversion systems.
Coordination Chemistry
Acts as a bidentate ligand in coordination chemistry, forming complexes with various metal ions for diverse research purposes.
| Molecular weight | 156.18 |
|---|---|
| Empirical formula | C10H8N2 |
| Assay | 98% |
| Boiling point | 305 °C(lit.) |
| Melting point | 109-112 °C(lit.) |

Hazard statements
- H301Toxic if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P301IF SWALLOWED
- P305IF IN EYES
| Protective equipment | Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 2811 6.1 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T |
| Risk statements (R) | 25-36/37/38 |
| Safety statements (S) | 26-36/37/39-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 4,4′-Dipyridyl used for?
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4,4′-Dipyridyl is used in materials science, organic and printed electronics, photochromic and thermochromic dyes, and photonic and optical materials. It also finds applications in coordination chemistry.
What is the CAS number and molecular formula for 4,4′-Dipyridyl?
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The CAS number is 553-26-4 and the molecular formula is C10H8N2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4,4′-Dipyridyl with an assay of 98%. We do not represent this product as USP, BP, or EP grade.
How should 4,4′-Dipyridyl be handled safely?
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4,4′-Dipyridyl is a Danger hazard. It is toxic if swallowed, causes skin irritation, and causes serious eye irritation with possible respiratory irritation. Appropriate personal protective equipment including eyeshields, faceshields, gloves, and P2 respirator cartridges (EN 143) should be used. Refer to the SDS for full safety instructions.
Is 4,4′-Dipyridyl a controlled substance?
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The provided data does not indicate that 4,4′-Dipyridyl is a controlled substance.
How is 4,4′-Dipyridyl packed and shipped?
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This material is classified under UN 2811, Class 6.1, Packing Group III, indicating it is shipped as a toxic solid.
How can I request a sample or quote for 4,4′-Dipyridyl?
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Please contact our sales team via the website or your dedicated account manager to request a sample or a quotation for 4,4′-Dipyridyl.
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