TCI D2158 1,8-Diiodooctane, commonly abbreviated DIO among materials researchers, is an eight-carbon aliphatic compound bearing an iodine atom at each end of the chain, supplied in a stabilized form using copper chips. In the laboratory this material serves two very different but equally important roles. As an organic synthesis reagent, its two primary iodide groups make it an effective bifunctional alkylating agent for building linker chains or closing macrocyclic rings. As a processing additive, DIO has become one of the best-known ingredients in the fabrication of active layers for solution-processed organic electronic devices.
The characteristic that makes it so widely chosen is the combination of a boiling point far higher than that of common processing solvents together with the ability to dissolve certain components selectively. This property is precisely what causes DIO to evaporate later as a thin film dries, giving the molecules additional time to organize themselves and form a more ordered morphology. From the reactivity standpoint, the primary carbon–iodine bonds are relatively easy to displace with nucleophiles, while the long, flexible methylene chain provides spacing between the two reactive ends, which is useful when a defined distance is required between two functional groups.
In Indonesian laboratories, this reagent is typically found in university and institutional research groups working on organic synthesis and on organic electronic materials, where it is used either as a bifunctional building block or as a small-volume additive in film-formation studies. Because it is normally consumed in modest quantities per experiment, it is usually stocked as a shared reagent within a research group and drawn on across successive batches of synthesis or device fabrication work.
- Bifunctional alkylation in organic synthesis: the two primary iodide groups react readily with nucleophiles, allowing both ends of the chain to be functionalized in a controlled manner.
- Macrocyclization reactions: the flexible eight-carbon methylene chain lets both reactive termini reach a common partner, making it suitable for closing rings of defined size.
- Linker construction between functional groups: the long chain sets a fixed spacing between the two attachment points, useful when a specific separation distance is needed.
- Processing additive for solution-processed organic electronic active layers: its high boiling point delays evaporation during film drying, extending the time available for molecular ordering.
- Morphology control studies in thin films: selective solubility toward certain components allows researchers to influence how the film organizes as it dries.
| Brand | TCI |
|---|---|
| CAS number | 24772-63-2 |
| Molecular formula | — |
| Purity | — |
| Category | Chemistry > Building Blocks > Non-Heterocyclic Building Blocks |
| Pack sizes | available in standard TCI catalogue pack sizes; please confirm the required size when ordering |
| Physical form | — |
| Storage | keep in a cool, dark place in a tightly closed container |
- Product code: D2158
- Form: supplied stabilized with copper chips
Store the container tightly closed in a cool, dark, and well-ventilated place, away from heat sources, direct sunlight, and strong oxidizing agents. Organoiodine compounds of this type are generally light-sensitive, so amber glass or otherwise light-protected containers are preferred, and the copper chip stabilizer should be left in place rather than filtered out during storage. Handle in a fume hood using nitrile gloves, safety goggles, and a laboratory coat, and avoid contact with skin, eyes, and clothing. Transfer with clean, dry glassware or syringes to limit moisture ingress, reclose the container promptly after use, and label any aliquots clearly. Dispose of residues and contaminated materials as halogenated organic waste in accordance with your institution's chemical waste procedures, and consult the manufacturer's safety data sheet before first use.
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