Photochemical production of oligothiophene and polythiophene micropatterns from 2,5-diiodothiophene on Au in UHV

Geochemical evolution of organic-rich shales with increasing maturity: A STXM and TEM study of the Posidonia Shale (Lower Toarcian, northern Germany)

“…6). This peak can thus undoubtedly be attributed to the presence of unsaturated bonds between carbon and sulphur as previously proposed by Liu et al (2005) and Lepot et al (2009). Additionally, a shift of the aromatic peak from 285.3 to 285.1 eV and a decrease of the 287.7 shoulder intensity occur when a significant absorption is measured at 286.3 eV.…”

“…The shoulder at 287.7 eV is indicative of aliphatic carbon (1s / 3p/s*) (CeH 1e3 ). The absorption feature at 286.3 eV has been previously attributed to the presence of unsaturated bonds between carbon and heteroatoms such as oxygen (Braun et al, 2005(Braun et al, , 2009, nitrogen (Shi et al, 2005) or sulphur (Liu et al, 2005). The more gentle absorption feature observed at 290.3 eV likely results from the close association with carbonates which specifically absorb at 290.3 eV (Benzerara et al, 2004;Brandes et al, 2010).…”

“…Such absorption at 288 eV is unambiguously indicating the presence of aliphatic carbon (1s / 3p/s*) (CeH 1e3 ) (Cody et al, 1998). Although the absorption at 287.7 eV is sometimes attributed to the presence of unsaturated bonds between carbon and heteroatoms such as oxygen (Braun et al, 2005(Braun et al, , 2009, nitrogen (Shi et al, 2005), or sulphur (Liu et al, 2005), it is most commonly ascribed to the 1s / 3p/s* transitions of CeH 1e3 (aliphatic carbon bonded to one, two, or three hydrogens) (Cody et al, 1998;Boyce et al, 2002;Hitchcock et al, 2007). The very low intensity features observed at 285.3 eV can be interpreted as 1s / p* transitions in aromatic or olefinic carbon (C¼C) (Cody et al, 1996(Cody et al, , 1998Boyce et al, 2002Boyce et al, , 2004.…”

Unoccupied electronic states in polythiophene as probed by XAS and RAS

“…This is in agreement with the previous results of gas-phase biphenyl. [13] In addition, PT is poorly conjugated [15] because thiophene rings are not aligned enough in parallel due to the rotation of interunit bond at room temperature. Such disorder also might affect the insufficient π * delocalization along the chain in the ground state, which could disturb the 'fast' delocalization of a resonantly excited electron.…”

Thermal reaction and desorption behaviors of 2,5-diiodothiophene on clean and passivated Au surfaces

“…Recently, we have extended the use of iodo-substituted compounds to generation of functional organic molecules or films on surfaces. For example, 2,5-diiodothiophene can be photochemically activated and coupled to produce thin films and micropatterns of oligothiophenes and polythiophenes on metal or oxide surfaces [4][5][6][7][8][9][10][11]. This approach is intriguing since it avoids the intractability problem of the unsubstituted oligothiophenes and polythiophene, i.e.…”