Telluracyclopentadiene

• CAS: 288-08-4
• Catalog Number: ACM288084
• Category: Main Products
• Molecular Weight: 179.67
• Molecular Formula: C4H4Te
• Synonyms: Tellurophene
• Appearance: Solid

Case Study

Tellurophene for Organic Optoelectronic and Photovoltaic Applications

Manion, Joseph G., et al. ACS Applied Energy Materials 1.9 (2018): 5033-5042.

Heavy atom substitution in conjugated polymers offers a powerful strategy for tuning optoelectronic properties. Manion, J., et al. systematically examined the structure-property-function relationships in a series of chalcogenophene homopolymers of thiophene, selenophene, and tellurophene with well-matched molecular weights, dispersity, and regioregularity. The study directly compared how increasing heteroatom size from sulfur to selenium to tellurium influences polymer assembly, donor-acceptor mixing, charge separation, and photovoltaic device performance.
Experimental Protocol: Controlled polymerization methods were used to synthesize chalcogenophene homopolymers with comparable molecular weights and dispersities. BHJ photovoltaic cells were fabricated using both fast and slow drying preparations to study polymer-fullerene separation effects. PHJ devices were constructed to examine charge transport and generation in the absence of polymer-fullerene mixing. Morphological characterization employed atomic force microscopy and grazing-incidence X-ray scattering. Ultrafast transient absorption spectroscopy probed excited-state dynamics.
Performance Evaluation: In both drying preparations, increasing heteroatom size led to larger proportions of finely mixed polymer-fullerene domains. Differences in polymer-fullerene separation between preparations resulted in optimal morphologies for selenophene and tellurophene devices while having minimal impact on thiophene devices. PHJ devices exhibited similar diode behavior across all three polymers, indicating that heteroatom substitution primarily affects morphology rather than intrinsic charge transport. Ultrafast decay pathways unique to heavy heteroatom-containing polymers were observed in both device architectures, demonstrating that single-atom substitution can significantly modify polymer assembly, mixing, and optoelectronic properties.

Tellurophene-Based Conjugated Polymers for Field-Effect Transistors

Wang, Shitao, et al. Chemical Science 12.16 (2021): 5811-5817.

The Baeyer-Villiger (BV) oxidation is a fundamental transformation in organic chemistry wherein a ketone is converted to an ester or lactone through oxygen atom insertion. Wang, S., et al. discovered a novel hetero-BV oxidation, termed tellura-BV oxidation, which enables the one-step transformation of tellurophene into chiral tellurinate lactone. By oxidizing a tellurophene-embedded electron-rich polycycle with meta-chloroperbenzoic acid (mCPBA) or Oxone, an oxygen atom is selectively inserted into the Te-C bond of the tellurophene ring. The reaction proceeds through initial oxidation to the tellurophene Te-oxide intermediate, followed by tellura-BV rearrangement to yield the tellurinate lactone product. This transformation was further validated on hybrid trichalcogenasumanene substrates, demonstrating high chemoselectivity for tellurium over sulfur and selenium.
Key Findings: The tellura-BV oxidation proceeded with high chemoselectivity, exclusively targeting the tellurophene moiety while leaving thiophene and selenophene units intact in hybrid trichalcogenasumanene substrates. The resulting tellurinate lactone products exhibited strong secondary bonding interactions between Te=O groups, leading to dimerization into U-shaped polycycles. Notably, both the monomeric tellurinate lactones and their dimers displayed chirality. This work demonstrates the first example of hetero-BV oxidation, providing a direct route from tellurophene to tellurinate lactone and enabling the construction of intricate chiral polycyclic architectures.