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• 3172-56-3 3,3'-bithiophene 

Downstream Products

• 1407489-36-4 7-(diphenylmethylene)-7H-cyclopenta[1,2-b:4,3-b']dithiophene 
• 1520923-54-9 2,5,8,11-tetraphenylcycloocta[1,2-b:4,3-b':5,6-b'':8,7-b''']tetrathiophene 

Relevant academic research and scientific papers

Rethinking Uncaging: A New Antiaromatic Photocage Driven by a Gain of Resonance Energy

Photoactivatable compounds for example photoswitches or photolabile protecting groups (PPGs, photocages) for spatiotemporal light control, play a crucial role in different areas of research. For each application, parameters such as the absorption spectrum, solubility in the respective media and/or photochemical quantum yields for several competing processes need to be optimized. The design of new photochemical tools therefore remains an important task. In this study, we exploited the concept of excited-state-aromaticity, first described by N. Colin Baird in 1971, to investigate a new class of photocages, based on cyclic, ground-state-antiaromatic systems. Several thio- and nitrogen-functionalized compounds were synthesized, photochemically characterized and further optimized, supported by quantum chemical calculations. After choosing the optimal scaffold, which shows an excellent uncaging quantum yield of 28 %, we achieved a bathochromic shift of over 100 nm, resulting in a robust, well accessible, visible light absorbing, compact new photocage with a clean photoreaction and a high quantum product (??Φ) of 893 M?1 cm?1 at 405 nm.

Efficient synthesis of trimethylsilyl-substituted dithieno[2,3-b:3′, 2′-d]thiophene, tetra[2,3-thienylene] and hexa[2,3-thienylene] from substituted [3,3′]bithiophenyl

Efficient synthetic procedures for the preparation of β-trithiophenes (dithieno[2,3-b:3′,2′-d]thiophene) and two macrocyclic compounds, tetra[2,3-thienylene] and hexa[2,3-thienylene] bearing trimethylsilyl (TMS) groups from 2,2′-dibromo-5,5′-bistrimethylsilanyl[3,3′] bithiophenyl are reported. The UV-Vis spectra property and crystal structures of these macrocyclic oligothiophenes are described. Georg Thieme Verlag Stuttgart.

Optoelectronic and thermal properties of highly fluorescence emissive 2,2′-distyryl-[3,3′]-bithiophenes

Five newly designed organic small molecules (DSBTs, 1–5) with 3,3′-bithienyl unit had been successfully synthesized with 3-bromothiophene as the starting material. In both UV–vis absorption and fluorescence emission investigation, compound 3 with nitro-substitution exhibited the largest bathochromic shift and narrowest optical bandgap among 1–5. Further photophysical studies showed that 3 had obvious solvatochromism and aggregation-induced emission (AIE) property. The electrochemical properties and thermal stabilities studies demonstrated that 3 had high electron affinity and good thermal stability, which in combination with favorable optical properties indicated the prospect of 3 as a promising material in optoelectronic devices. Finally, theoretical calculations on structures, frontier molecular orbitals, UV–vis spectra and electronic transitions gave a good acknowledge of the relationship between optoelectronic properties and molecular structures.

Three-dimensional covalent organic frameworks based on a π-conjugated tetrahedral node

The construction of three-dimensional (3D) covalent organic frameworks (COFs), especially fully conjugated 3D COFs, is a long-standing challenge. Herein, we report a saddle-like, π-conjugated cyclooctatetrathiophene (COTh) as a tetrahedral node to construct fully conjugated 3D COFs. The present work enriches the structural diversities and potential applications of 3D COFs.

Synthesis and Crystal Structure of a Tubular Sexithiophene

(matrix presented) The synthesis of a rigid, tubular sexithiophene is reported. Close intermolecular Cl...-Cl interactions play a significant role in defining the crystal structure.