3,3′-Diethylthiatricarbocyanine iodide
3,3′-Diethylthiatricarbocyanine iodide (CAS 3071-70-3), with a molecular weight of 544.51, is a potent infrared (IR) dye. This cyanine dye exhibits strong absorption around 765 nm, making it valuable in various spectroscopic and imaging applications. It is particularly recognised for its utility as a fluorescent probe and in materials science, functioning as an IR dye and laser dye.
- IUPAC
- 3-Ethyl-2-[7-(3-ethyl-2-benzothiazolinylidene)-1,3,5-heptatrienyl]benzothiazolium iodide,DTTC iodide,DTTCI,DiSC2(7)
- Synonyms
- C25H25IN2S23-Ethyl-2-[7-(3-ethyl-2-benzothiazolinylidene)-1,3,5-heptatrienyl]benzothiazolium iodideDTTC iodideDTTCIDiSC2(7)

Fluorescent Probes and Stains
This compound serves as an effective fluorescent probe and stain, particularly for lipophilic and membrane applications. It is suitable for both microscopy and flow cytometry, allowing for detailed cellular and tissue analysis.
Infrared (IR) Dye
As a prominent IR dye, it is utilised in applications requiring fluorescence in the infrared spectrum. This includes its use as a laser dye for specific optical applications.
Materials Science
Its unique optical properties make it a candidate for use in materials science, particularly in the development of organic and printed electronics and photonic materials.
| Molecular weight | 544.51 |
|---|---|
| Empirical formula | C25H25IN2S2 |
| Assay | 99% |
| Application | IR dye |
| Melting point | 211 °C (dec.)(lit.) |

Hazard statements
- H302Harmful if swallowed
- H312Harmful in contact with skin
- H315Causes skin irritation
- H319Causes serious eye irritation
- H332Harmful if inhaled
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 20/21/22-36/37/38 |
| Safety statements (S) | 26-36/37 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Absorption | λmax 765 nm |
|---|
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 3,3′-Diethylthiatricarbocyanine iodide used for?
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3,3′-Diethylthiatricarbocyanine iodide is used as an infrared (IR) dye, a laser dye, and a fluorescent probe for lipophilic and membrane applications in microscopy and flow cytometry. It also finds utility in materials science.
What is the CAS number and formula for 3,3′-Diethylthiatricarbocyanine iodide?
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The CAS number is 3071-70-3. The empirical formula is C25H25IN2S2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3,3′-Diethylthiatricarbocyanine iodide with an assay of 99%. We do not represent this product as USP, BP, or EP grade.
What are the main hazards associated with 3,3′-Diethylthiatricarbocyanine iodide?
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This compound is classified as harmful if swallowed, in contact with skin, or if inhaled. It also causes skin irritation, serious eye irritation, and may cause respiratory irritation. Appropriate personal protective equipment, including a dust mask, eyeshields, and gloves, should be used when handling.
How is 3,3′-Diethylthiatricarbocyanine iodide packed and shipped?
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3,3′-Diethylthiatricarbocyanine iodide is carefully packed and exported by Tech Serve Solutions in compliance with all relevant shipping regulations.
How can I request a sample or quote for 3,3′-Diethylthiatricarbocyanine iodide?
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To request a sample or a quotation for 3,3′-Diethylthiatricarbocyanine iodide, please contact our sales team through the website or by phone.
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