Synthesis of dihydroxyoligophenylenes containing π-deficient or π-excess hetero-aromatic rings and their solvatochromic behavior
摘要:
Dihydroxyoligophenylenes (HO-ArPh(m)-OHs) with 9,9-dihexy1-2,7-fluorene (Ar=Flu), 2,5-dioctyloxy-1,4-benzene (Ar=Dob), pyridine (Ar=Py), or thiophene (Ar=Th) rings were synthesized by the Suzuki coupling reaction. Absorption maxima (lambda(max)) of HO-ArPh(m)-OHs shifted progressively toward long wavelengths due to the expansion of the it-conjugation system with an increase in the number of benzene rings. Deprotonation of the OH groups of HO-ArPh(m)-OHs by treatment with NaH caused a bathochromic shift of lambda(max). The bathochromic shift of the deprotonated species increased with the donor numbers (DNs) of the solvents. The emission peak positions of NaO-ArPh(m)-ONas depended on the DNs of the solvents; therefore, the emission color could be tuned by changing the solvent. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of dihydroxyoligophenylenes containing π-deficient or π-excess hetero-aromatic rings and their solvatochromic behavior
摘要:
Dihydroxyoligophenylenes (HO-ArPh(m)-OHs) with 9,9-dihexy1-2,7-fluorene (Ar=Flu), 2,5-dioctyloxy-1,4-benzene (Ar=Dob), pyridine (Ar=Py), or thiophene (Ar=Th) rings were synthesized by the Suzuki coupling reaction. Absorption maxima (lambda(max)) of HO-ArPh(m)-OHs shifted progressively toward long wavelengths due to the expansion of the it-conjugation system with an increase in the number of benzene rings. Deprotonation of the OH groups of HO-ArPh(m)-OHs by treatment with NaH caused a bathochromic shift of lambda(max). The bathochromic shift of the deprotonated species increased with the donor numbers (DNs) of the solvents. The emission peak positions of NaO-ArPh(m)-ONas depended on the DNs of the solvents; therefore, the emission color could be tuned by changing the solvent. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of dihydroxyoligophenylenes containing π-deficient or π-excess hetero-aromatic rings and their solvatochromic behavior
作者:Isao Yamaguchi、Kenji Seo、Yukari Kawashima
DOI:10.1016/j.tet.2010.06.087
日期:2010.8
Dihydroxyoligophenylenes (HO-ArPh(m)-OHs) with 9,9-dihexy1-2,7-fluorene (Ar=Flu), 2,5-dioctyloxy-1,4-benzene (Ar=Dob), pyridine (Ar=Py), or thiophene (Ar=Th) rings were synthesized by the Suzuki coupling reaction. Absorption maxima (lambda(max)) of HO-ArPh(m)-OHs shifted progressively toward long wavelengths due to the expansion of the it-conjugation system with an increase in the number of benzene rings. Deprotonation of the OH groups of HO-ArPh(m)-OHs by treatment with NaH caused a bathochromic shift of lambda(max). The bathochromic shift of the deprotonated species increased with the donor numbers (DNs) of the solvents. The emission peak positions of NaO-ArPh(m)-ONas depended on the DNs of the solvents; therefore, the emission color could be tuned by changing the solvent. (C) 2010 Elsevier Ltd. All rights reserved.