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Application Note LAAN-C-XX-E027 Application Synthesis and Evaluation of Various Photoluminescent Materials via New Organometallic Chemistry Routes Note – Utilization of Ultraviolet-visible (UV-vis) Absorption and Photoluminescence (PL) Spectra – No. 45 Yoshimasa Matsumura (1), Hiroshi Eguchi (2), Ikuyoshi Tomita (2) Heteroatom-containing π-conjugated polymers High efficiency aggregation-induced emission dyes Electric and Electronic Industry 1. Introduction Organic molecules and macromoleculers with extended conjugated π-electron systems exhibit intriguing electronic and optical properties, and they are expected to serve as next-generation functional materials for organic film solar cells, organic transistors, organic electro-luminescence (OEL) devices, etc. In particular, the materials utilizing the photoluminescent properties are applicable not only to OEL but also many fields, such as chemical sensors, PL imaging probes, etc. Since the photoluminescence properties, i.e. colors and intensities, depend on the chemical structure of the materials, synthetic methods that enable versatile molecular designs of this class of materials are significantly Fig. 1 Shimadzu spectrofluorophotometer, RF-6000, important. This article introduces synthetic methods for used for fluorescence measurements π "heteroatom-containing unprecedented -conjugated polymers" and "high efficiency aggregation-induced emission (AIE) dyes" we reported recently, as well as the 2. Group 15 elements-containing successful results obtained by the evaluation of their π-conjugated polymers [1], [2] optical features using an UV-vis spectrophotometer π (UV-3100) and spectrofluorophotometers (RF-5300 or Among a number of -conjugated polymers reported RF-6000). to date, those containing heterocyclic structures such as heteroles are attractive functional materials that often exhibit excellent fluorescence properties. Since (1) Graduate School of Science and Engineering, Yamagata University (2) Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology 1 Application No. 45 Note energy levels of the highest occupied molecular orbital on the synthesis and reactions of organometallic (HOMO) and the lowest unoccupied molecular orbital polymers possessing reactive carbon-metal bonds in (LUMO) of the heterole units are affected largely by the main chain. In particular, it was found that the incorporated heteroatoms, it is expected that the π-conjugated polymers possessing heteroles in the color of their photoluminesce can be tuned by varying main chain can be obtained by the reactions of both the heteroatoms and the repeating strucutures organometallic polymers, which are generated by the of the π-conjugated polymers. polymerization based on the regioselective metallacyclization between terminal acetylenes and a In most cases, the heterole-containing polymers are low-valent titanium complex, [7,8] with various obtainable by the transition metal-catalyzed electrophiles containing heteroatoms (Fig. 2). [9-12] On polycondensation of monomers carrying the the basis of the transformations of the organotitanium corresponding heteroles. However, some heteroles polymers, π-conjugated polymers containing are not stable enough as monomers or may inhibit the phosphole and arsole, could be achieved. polymerizations. Accordingly the synthesis of π-conjugated polymers with such heterole units has As a typical example, the titanacyclopentadiene- scarcely been investigated. containing polymer (3a) was prepared by the reaction of a diene monomer (1a) with a titanium complex (2) The heteroles containing the group 15 elements such from -78 °C to -50 °C in diethyl ether (Fig. 3). This as phospholes exhibit unique electron-accepting [3] polymer (3a) was subjected to the transformation into property based on the σ*-π* orbital interaction. a phosphole-containing polymer (4a-P) and an Although they are expected to serve as building arsole-containing polymer (4a-As) by reactions with blocks for functional materilas, only several reports dichlorophenylphosphine and diiodophenylarsine, have described the synthesis of phosphole-containing [4]-[6] respectively. The obtained polymers containing group polymers. Concerning the arsole-containing 15 elements are dark red colored materials that polymers, within the knowledge of the authors, no exhibit orange photoluminescence upon the report has described their synthesis, although the irradiation with ultraviolet light. arsoles may exhibit much excellent oxidation-resistant properties which are attractive for many applications. To establish synthetic methods of a variety of heterole-containing polymers, we have been working i Ti(OPr )2 PriO OPri Ti Ar Ar n Y Cl Cl Y = S Se Te O R R S Sn Y Ar n Fig. 2 Synthesis of π-conjugated polymers containing various heteroles via organotitanium polymers RO Ph P n i PhPCl2 Ti(OPr )2 OR RO RO i i 4a-P 2 Pr O OPr -50 ºC ~ r.t., 3 h Ti Yield = 76% n Et2O Mn (Mw/Mn) = 6100 (1.9) PhAsI2 OR -78 ºC ~ -50 ºC, 12 h OR RO Ph 1a 3a -50 ºC ~ r.t., 3 h As R = n OR 4a-As Yield = 88% Mn (Mw/Mn) = 5500 (2.5) Fig. 3 Synthesis of phosphole- and arsole-containing polymers via an organotitanium polymer 2 The optical characteristics of the obtained polymers are due to the σ*-π* orbital interaction as expected for the evaluated from the UV-vis absorption spectra and PL heavier group 15 elements-containing heteroles. spectra (Fig. 4, Table 1). For example, in the UV-vis Likewise, the absorption spectrum of the arsole- absorption spectrum of 4a-P, the absorption maximum containing polymer (4a-As) appeared in the longer (λmax) and absorption onset (λonset) are 522 nm and wavelength region compared to that of the model 620 nm, respectively. These values are more than compound (As-model)[13]. It is also plausible that the 100 nm longer than those of a diarylphosphole arsole skeleton exhibits a low LUMO energy level due to derivative (P-model)[1], which was synthesized as a the σ*-π* orbital interaction . model compound. This result suggests that the The PL spectra of the polymers were measured on the π -conjugation takes place effectively along the polymer RF-5300 spectrofluorophotometer under the excitation main chain. Compared to the case of a thiophene- light at their λ . The emission maxima (E ) of 4a-P [12] λ λ max max containing polymer ( max = 407 nm, onset = 520 nm), and 4a-As were 593 nm and 600 nm and fluorescence which was likewise synthesized via the organotitanium quantum yields (Φ) were 0.10 and 0.05, respectively. polymer, the phosphole-containing polymer proved to Thus, 4a-P and 4a-As were found to exhibit spectral exhibit its absorption in a longer wavelength range by similarities, while their electrochemical redox properties approximately 100 nm. These results suggest that the were dramatically different stemming from nature of band gap of the phosphole-containing polymer is the elements.[2] narrower reflecting upon the lower LUMO energy level Table 1 Optical properties of phosphole- and arsole-containing π-conjugated polymers and their model compounds a) a) b c) d) Compounds λmax (nm) λonset (nm) Emax ) (nm) Φ E g(opt) (eV) P-model[1] 396 448 477 0.57 2.77 4a-P 522 620 594 0.10 2.00 As-model[13] 395 446 476 0.51 2.78 4a-As 517 612 600 0.05 2.02 a) Measured in CHCl3; b) Emission maxima, irradiated at their λmax (nm); c) The quantum yields (Φ) were estimated at ambient temperature using quinine sulfate in 0.50 M sulfuric acid aqueous solution as a standard; d) Estimated from λonset. Fig. 4 (a, c) UV-vis absorption spectra and (b, d) PL spectra Synthesis and Evaluation of Various Photoluminescent Materials via New Organometallic Chemistry Routes 3 Application No. 45 Note 3. Parallel synthesis of photoluminescent hydrochloric acid, and dichlorophenylphosphine, polymers via an organotitanium respectively. [14] polymer The UV-vis absorption spectra of 4b-S, 4b-H, and 4b-P were measured from which their λmax were observed As described above, polymers having diverse structures at 407 nm, 438 nm, and 478 nm, respectively (Fig. 6, are now accessible by the polymer reactions Table 2). The longer wavelength absorption observed associated with the main chain-transformation of the in 4b-P is in good accordance with the lower LUMO organotitanium polymers. Using this method, various energy level of the phosphole unit leading to the functional materials having different properties can be narrower band gap as mentioned above. derived in a parallel way starting from a single organotitanium reactive polymer. With an objective to These polymers exhibit excellent photoluminescent obtain polymers with excellent photoluminescence, properties, whose color depends on the building three kinds of polymers were prepared by the blocks in the polymers: 4b-S in blue, 4b-H in green, reactions of a fluorene-containing organotitanium and 4b-P in yellow. The PL spectra, measured on the polymer (3b) (Fig. 5). That is, 3b was prepared from a RF-5300, supported further that these polymers emit 2,6-diethynylfluorene derivative (1b) and the titanium light in different wavelengths with good efficiency complex (2) which was then transformed to thiophene, (Fig. 6). butadiene, and phosphole-containing polymers (4b-S, 4b-H, and 4b-P) by reactions with sulfur monochloride, H17C8 C8H17 S n S Cl 2 2 4b-S Yield = 88% i -50 ºC ~ r.t., 3 h M (M /M ) = 6500 (1.6) Ti(OPr )2 n w n H17C8 C8H17 H17C8 C8H17 H17C8 C8H17 i i 2 Pr O OPr Ti HCl n -50 ºC ~ r.t., 1 h OMe 1b 3b 4b-H n -78 ºC ~ -50 ºC, 12 h Yield = 83% PhPCl2 Mn (Mw/Mn) = 8500 (2.2) -50 ºC ~ r.t., 3 h H17C8 C8H17 Ph P n 4b-P Yield = 50% Mn (Mw/Mn) = 5500 (1.9) Fig. 5 Parallel synthesis of photoluminescent polymers by the reaction of a fluorene-containing organotitanium polymer Table 2 Optical properties of polymers a) a) b) c) d) Polymers λmax (nm) λonset (nm) Emax (nm) Φ E g(opt) (eV) 4b-S 407 483 470 0.18 2.56 4b-H 438 499 485 0.30 2.48 4b-P 478 546 529 0.37 2.27 a) Measured in CHCl3; b) Emission maxima, irradiated at their λmax (nm); c) The quantum yields (Φ) were estimated at ambient temperature using quinine sulfate in 0.50 M sulfuric acid aqueous solution as a standard; d) Estimated from λonset.
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