Crystal structures of β‐chalcogeno‐α, β‐unsaturated chalcogenoesters: Novel intramolecular interaction between the carbonyl oxygen and the chalcogen atom at the β‐position

Abstract

A series of β-chalcogeno-α, β-

Synthesis and electrical properties of novel oligothiophenes partially containing 3,4-ethylenedioxythiophenes

“…Very recently, it is reported that the intramolecular interaction between chalcogen atoms affects the geometry of molecules, although the origin of the interaction is still not clear. [39][40][41][42][43] For example, it is reported that the crystal structure of EDOT dimer shows the planar structure, and that the distances between sulfur and oxygen atoms is signicantly shorter than the sum of their van der Waals radii, which evidences the occurrence of the above-mentioned strong interaction. 39 Such a rigid conjugated system will cause the quinoid-like planar geometry even in ground state of E3T, which is likely to give the vibronic ne structure in the absorption spectrum and the decrease in the Stokes shi of the emission spectrum as observed in Fig.…”

Transition-Metal-Catalyzed S–H and Se–H Bonds Addition to Unsaturated Molecules

“…b-Sulfanyl-a,b-unsaturated carbonyl compounds like the thioformylation products are structurally interesting, because the n-s* interaction between the sulfanyl group and carbonyl group are observed [110].…”

Synthesis and Properties of Donor-acceptor-type Polymers Comprising Alkoxy-substituted Bithiophene Units

“…It has been reported that the intramolecular interaction between chalcogen atoms affects the geometry of molecules, although the origin of this interaction is still not clear [38][39][40][41][42]. For example, it has been reported that the crystal structure of the 3,4-ethylenedioxythiophene dimer, which has oxygen atoms at the β-position of the thiophene ring similarly to 3-(n-pentyloxy)thiophene, has a planar structure, and that the distance between the sulfur and oxygen atoms is significantly shorter than the sum of their van der Waals radii.…”