02081nas a2200241   4500008004100000022001400041245011300055210006900168260006700237300001400304490000700318520123700325653001401562653001101576653000801587653001701595100001901612700001801631700001601649700003001665700002101695856012301716       2016                        eng d  a0887-624X00aSite-selective synthesis and characterization of BODIPY-acetylene copolymers and their transistor properties0 aSiteselective synthesis and characterization of BODIPYacetylene   a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcJUL  a1978-19860 v543 a<p>To study the effect of site-selective copolymerization of borondipyrromethene (BODIPY) with acetylene on the structural and optoelectronic properties, three copolymers P1-P3 were synthesized by the Sonogashira cross-coupling of BODIPY units with diacetylene and bromine capping through all the possible linkages: alpha-alpha (P1), alpha-beta (P2), and beta-beta (P3). The optoelectronic properties of the polymers were investigated systematically to understand the effect of site-selective polymerization. The HOMO levels of the polymers were significantly tuned from P1 to P3 with negligible change in the LUMO levels. Broadening of absorption spectra from P3 to P1 was observed because of increase in the extent of conjugation. Additionally, the charge transport properties of these polymers in organic thin-film transistors (OTFTs) revealed that P1 and P3 exhibited only p-type mobility, whereas P2 exhibited electron mobility. Notably, the further investigations of the surface morphology of polymer films by atomic force microscopy (AFM) unveiled that comb like nanostructural arrangements in P3 was beneficial for the charge-carrier mobility over the circular arrangements in P1 and P2. (C) 2016 Wiley Periodicals, Inc.</p>10aacetylene10aBODIPY10aDFT10alow-band gap1 aDebnath, Sashi1 aSingh, Saumya1 aBedi, Anjan1 aKrishnamoorthy, Kothandam1 aZade, Sanjio, S.  uhttps://library.ncl.res.in/content/site-selective-synthesis-and-characterization-bodipy-acetylene-copolymers-and-their02298nas a2200241   4500008004100000245013900041210006900180260000800249300001400257490000600271520142600277653002201703653001101725653002801736653001501764653002501779653002001804100002101824700003401845700002301879700003001902856012401932       2023                        eng d00aOrganic field effect transistors comprising copolymers synthesized without structure-directing moieties with enhanced carrier mobility0 aOrganic field effect transistors comprising copolymers synthesiz  cAPR  a2338-23440 v53 a<p>
	Conjugated materials are synthesized by C-C bond formation reactions. Trimethyltin and boronic acid are two widely used structure-directing moieties. While using the ethynyl moiety as a part of the monomer, additional structure-directing moieties are not needed. However, ethynylene will be part of the conjugated material. Often, the polymers with an ethynylene moiety negatively impact the polymers' properties. However, the ethynylene moiety could minimize the dihedral angle if the monomer has steric functionalities. For example, BODIPY is an attractive monomer due to its high molar extinction coefficient, partial quinoidal character, and high quantum yield. However, materials based on BODIPY exhibited poor charge carrier mobility due to steric hindrance generated by four methyl groups. Herein, we copolymerize BODIPY with ethynylene comprising i-indigo and thieno-i-indigo. The copolymer with thieno-i-indigo showed increased molecular weight and significantly reduced band gap compared to the copolymer with i-indigo. The copolymer with i-indigo showed immeasurably low hole transport mobility. On the other hand, the copolymer with thieno-i-indigo exhibited 0.003 cm2V(-1) s(-1). These measurements were made using field effect transistors. We also measured the charge carrier mobility using the space charge-limited current method. Both copolymers exhibited a mobility of 10(-3) cm(2) V-1 s(-1).</p>
10aacetylene linkage10aBODIPY10afield effect transistor10aiso-indigo10aSonogashira coupling10athienoisoindigo1 aSwain, Gitanjali1 aJavaregowda, Bharathkumar, H.1 aDambhare, Neha, V.1 aKrishnamoorthy, Kothandam  uhttps://library.ncl.res.in/content/organic-field-effect-transistors-comprising-copolymers-synthesized-without-structure