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Bhowmik PK, Jo TS, Koh JJ, Park J, Biswas B, Principe RCG, Han H, Wacha AF, Knaapila M. Poly(Pyridinium Salt)s Containing 2,7-Diamino-9,9'-Dioctylfluorene Moieties with Various Organic Counterions Exhibiting Both Lyotropic Liquid-Crystalline and Light-Emitting Properties. Molecules 2021; 26:molecules26061560. [PMID: 33809075 PMCID: PMC7998704 DOI: 10.3390/molecules26061560] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 03/04/2021] [Accepted: 03/08/2021] [Indexed: 12/04/2022] Open
Abstract
A series of poly(pyridinium salt)s-fluorene main-chain ionic polymers with various organic counterions were synthesized by using ring-transmutation polymerization and metathesis reactions. Their chemical structures were characterized by Fourier Transform Infrared (FTIR), proton (1H), and fluorine 19 (19F) nuclear magnetic resonance (NMR) spectrometers. These polymers showed a number-average molecular weight (Mns) between 96.5 and 107.8 kg/mol and polydispersity index (PDI) in the range of 1.12–1.88. They exhibited fully-grown lyotropic phases in polar protic and aprotic solvents at different critical concentrations. Small-angle X-ray scattering for one polymer example indicates lyotropic structure formation for 60–80% solvent fraction. A lyotropic smectic phase contains 10 nm polymer platelets connected by tie molecules. The structure also incorporates a square packing motif within platelets. Thermal properties of polymers were affected by the size of counterions as determined by differential scanning calorimetry and thermogravimetric analysis measurements. Their ultraviolet-visible (UV-Vis) absorption spectra in different organic solvents were essentially identical, indicating that the closely spaced π-π* transitions occurred in their conjugated polymer structures. In contrast, the emission spectra of polymers exhibited a positive solvatochromism on changing the polarity of solvents. They emitted green lights in both polar and nonpolar organic solvents and showed blue light in the film-states, but their λem peaks were dependent on the size of the counterions. They formed aggregates in polar aprotic and protic solvents with the addition of water (v/v, 0–90%), and their λem peaks were blue shifted.
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Affiliation(s)
- Pradip K. Bhowmik
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway Box 454003, Las Vegas, NV 89154-4003, USA; (T.S.J.); (J.J.K.); (J.P.); (B.B.); (R.C.G.P.); (H.H.)
- Correspondence: ; Tel.: +1-702-895-0885 or +1-702-895-4072
| | - Tae S. Jo
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway Box 454003, Las Vegas, NV 89154-4003, USA; (T.S.J.); (J.J.K.); (J.P.); (B.B.); (R.C.G.P.); (H.H.)
| | - Jung J. Koh
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway Box 454003, Las Vegas, NV 89154-4003, USA; (T.S.J.); (J.J.K.); (J.P.); (B.B.); (R.C.G.P.); (H.H.)
| | - Jongwon Park
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway Box 454003, Las Vegas, NV 89154-4003, USA; (T.S.J.); (J.J.K.); (J.P.); (B.B.); (R.C.G.P.); (H.H.)
| | - Bidyut Biswas
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway Box 454003, Las Vegas, NV 89154-4003, USA; (T.S.J.); (J.J.K.); (J.P.); (B.B.); (R.C.G.P.); (H.H.)
| | - Ronald Carlo G. Principe
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway Box 454003, Las Vegas, NV 89154-4003, USA; (T.S.J.); (J.J.K.); (J.P.); (B.B.); (R.C.G.P.); (H.H.)
| | - Haesook Han
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway Box 454003, Las Vegas, NV 89154-4003, USA; (T.S.J.); (J.J.K.); (J.P.); (B.B.); (R.C.G.P.); (H.H.)
| | - András F. Wacha
- Research Centre for Natural Sciences, Institute of Materials and Environmental Chemistry, Magyar Tudósok körútja 2, 1117 Budapest, Hungary;
| | - Matti Knaapila
- Department of Physics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark;
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Poly(pyridinium salt)s with organic counterions derived from 3,3′-dimethylnaphthidine: thermal, liquid crystalline, and optical properties. JOURNAL OF POLYMER RESEARCH 2015. [DOI: 10.1007/s10965-014-0651-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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