02124nas a2200253   4500008004100000022001400041245012300055210006900178260011000247300001600357490000600373520114700379100002301526700002001549700002001569700002101589700002101610700002101631700002801652700002101680700001801701700002401719856012701743       2016                        eng d  a2046-206900aModulation of charge carrier mobility by side-chain engineering of bi(thienylenevinylene)thiophene containing PPE-PPVs0 aModulation of charge carrier mobility by sidechain engineering o  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAY  a51642-516480 v63 a<p>Four 2-dimensional conjugated poly(p-phenylene-ethynylene)-alt-poly(p-phenylene-vinylene) polymers containing a lateral bi(thienylenevinylene)thiophene unit (BTE-PVs) were synthesised and characterised. The investigated polymers share the same conjugated structure, but differ in the anchoring positions of solubilising linear octyloxy/branched 2-ethylhexyloxy side-chains. UV-vis spectra of the polymers in dilute chloroform solutions and as thin films were studied. X-Ray diffraction patterns as well as the bulk charge transport of polymer films cast from chlorobenzene solutions were also investigated. A dramatic effect of the solubilising side-chains on the charge carrier mobility of BTE-PV films was observed, with bulk hole mobility values ranging between 1.3 x 10(-5) cm(2) V-1 s(-1) and 2.2 x 10(-2) cm(2) V-1 s(-1), which is not ascribable to evident structural variations of the polymer films. It is shown that the combination of linear octyloxy and branched 2-ethylhexyloxy side-chains is favorable for the charge transport properties of BTE-PVs, compared to the incorporation of only linear or only branched side-chains.</p>1 aJadhav, Rupali, R.1 aCamaioni, Nadia1 aOppelt, Kerstin1 aTinti, Francesca1 aGazzano, Massimo1 aFattori, Valeria1 aWadgaonkar, Prakash, P.1 aRathgeber, Silke1 aHoppe, Harald1 aEgbe, Daniel, A. M.  uhttps://library.ncl.res.in/content/modulation-charge-carrier-mobility-side-chain-engineering-bithienylenevinylenethiophene02103nas a2200241   4500008004100000022001400041245009400055210006900149260000900218300001000227490000600237520130400243100001901547700002601566700002301592700002101615700002101636700002301657700001901680700002001699700001601719856012601735       2017                        eng d  a2045-232200aCrystallisation-enhanced bulk hole mobility in phenothiazine-based organic semiconductors0 aCrystallisationenhanced bulk hole mobility in phenothiazinebased  cAPR   a462680 v73 a<p>A series of three novel donor-acceptor systems based on C(3)-malononitrile-substituted phenothiazines was synthesised in good overall yields and their thermal, spectroscopic, and electrochemical properties were characterised. The compounds were prepared through a sequence of Ullmann-coupling, Vilsmeier-Haack formylation and Knoevenagel-condensation, followed by Suzuki-coupling reactions for introduction of aryl substitutents at C(7) position of the phenothiazine. The introduction of a donor unit at the C(7) position exhibited a weak impact on the optical and electrochemical characteristics of the compounds and led to amorphous films with bulk hole mobilities in the typical range reported for phenothiazines, despite the higher charge delocalisation as attested by computational studies. In contrast, highly ordered films were formed when using the C(7)-unsubstituted 3-malononitrile phenothiazine, exhibiting an outstanding mobility of 1 x 10(-3) cm(2) V-1 s(-1), the highest reported for this class of compounds. Computational conformational analysis of the new phenothizanes suggested that free rotation of the substitutents at the C(7) position suppresses the ordering of the system, thereby hampering suitable packing of the new materials needed for high charge carrier mobility.</p>1 aShinde, D., B.1 aSalunke, Jagadish, K.1 aCandeias, Nuno, R.1 aTinti, Francesca1 aGazzano, Massimo1 aWadgaonkar, P., P.1 aPriimagi, Arri1 aCamaioni, Nadia1 aVivo, Paola  uhttps://library.ncl.res.in/content/crystallisation-enhanced-bulk-hole-mobility-phenothiazine-based-organic-semiconductors