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Xia L, Ni J, Wu P, Ma J, Bao L, Shi Y, Wang J. Photoactive metal-organic framework as a bifunctional material for 4-hydroxy-4'-nitrobiphenyl detection and photodegradation of methylene blue. Dalton Trans 2018; 47:16551-16557. [PMID: 30417188 DOI: 10.1039/c8dt03278e] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Environmental pollution resulting from organic pollutants is becoming an overwhelming problem throughout the world, and how to efficiently detect or eliminate these organic pollutants remains an important issue for environmental protection. Herein, a cadmium(ii)-based MOF, Cd-TCAA, was successfully prepared by the hydrothermal reaction of 4,4',4''-tricarboxyltriphenylamine (H3tca), (E)-1,2-di(pyridin-4-yl)diazene (abp) and cadmium nitrate. Because the H3tca moiety is a typically versatile functional material that exhibits good hole-transporting capabilities, efficient light harvesting, and excellent electron-donating properties, this novel photoactive metal-organic framework operates as a bifunctional material for the detection and degradation of organic pollutants. It exhibits excellent selectivity and sensitivity towards 4-hydroxy-4'-nitrobiphenyl (HNBP) with a detection limit of 50 nM in solution, and represents the first example of a MOF-based sensor for the detection of HNBP. The photocatalytic activity of Cd-TCAA was also determined by investigating the photo-induced degradation of methylene blue (MB). Cd-TCAA has the advantages of excellent catalytic activity, stability, and recyclability.
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Affiliation(s)
- Lingling Xia
- School of Chemistry and Materials Science & Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
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Yurdacan HM, Li X, Nutt S, Hogen-Esch TE. Perfluoroalkyl end-functionalized polystyrene show lower glass transition temperatures. DSC and optical transmission studies. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.01.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Zhang ZM, Miao BX, Tang XX, Ni ZH. A series of 4,5,9,10-tetrahydropyrene-based tetraarylethenes: synthesis, structures and solid-state emission behavior. RSC Adv 2018; 8:15173-15180. [PMID: 35541313 PMCID: PMC9079984 DOI: 10.1039/c8ra00057c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 04/17/2018] [Indexed: 01/14/2023] Open
Abstract
By controlling the number of 4,5,9,10-tetrahydropyrene segments around the tetraarylethene core, a series of 4,5,9,10-tetrahydropyrene-based tetraarylethenes were synthesized and structurally characterized. An aggregation-induced emission (AIE) study indicated that all the compounds are AIE active: they are weak emitters in good solvents but highly emissive in the condensed phase, and hence are potential solid-state emitters. Their optical properties, electrochemical properties and theoretical calculations were investigated, and the results prove that the π-conjugation degree of these compounds increases with the increasing number of 4,5,9,10-tetrahydropyrene units. However, the fluorescence quantum yield in the solid state doesn't increase with increasing π-conjugation. We studied the reason for this by analyzing the crystal structures of some compounds, and proposed that the close degree of molecular packing in the solid state may be responsible for it. Loose packing of tetraarylethenes in the solid state can restrict the rotation of the aromatic rings but cannot constrain other non-radiative pathways efficiently, such as vibration, which leads to the unpredictable emission of the compounds. Tetraarylethenes with different π-conjugation degrees can be realized by controlling the number of 4,5,9,10-tetrahydropyrene segments. However, the fluorescence quantum yield of these compounds in films doesn't increase with the π-conjugation degree.![]()
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Affiliation(s)
- Zhao-Ming Zhang
- School of Chemical Engineering and Technology
- China University of Mining and Technology
- Xuzhou 221116
- People's Republic of China
- Graduate School of Chemical Sciences and Engineering
| | - Bao-Xi Miao
- School of Chemical Engineering and Technology
- China University of Mining and Technology
- Xuzhou 221116
- People's Republic of China
| | - Xin-Xue Tang
- School of Chemical Engineering and Technology
- China University of Mining and Technology
- Xuzhou 221116
- People's Republic of China
| | - Zhong-Hai Ni
- School of Chemical Engineering and Technology
- China University of Mining and Technology
- Xuzhou 221116
- People's Republic of China
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Peng Y, Feng Y, Deng GJ, He YM, Fan QH. From Weakness to Strength: C-H/π-Interaction-Guided Self-Assembly and Gelation of Poly(benzyl ether) Dendrimers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:9313-9320. [PMID: 27538342 DOI: 10.1021/acs.langmuir.6b02672] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The C-H/π interactions as the key driving force for the construction of supramolecular gels remain a great challenge because of their weak nature. We hereby employed for the first time weak C-H/π interactions for the construction of supramolecular dendritic gels based on peripherally methyl-functionalized poly(benzyl ether) dendrimers. Their gelation property is highly dependent on the nature of the peripheral methyl groups. Furthermore, single-crystal X-ray analysis and NMR spectroscopy revealed that multiple C-H/π interactions between the proton of the methyl group and the electron-rich peripheral methyl-substituted aryl ring played significant roles in the formation of supramolecular nanofibers and organogels. This study uncovers the critical role of weak noncovalent interactions and provides new insights into the further design of self-assembled nanomaterials.
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Affiliation(s)
- Yi Peng
- Beijing National Laboratory for Molecule Sciences (BNLMS), CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University , Xiangtan 411105, China
| | - Yu Feng
- Beijing National Laboratory for Molecule Sciences (BNLMS), CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China
| | - Guo-Jun Deng
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University , Xiangtan 411105, China
| | - Yan-Mei He
- Beijing National Laboratory for Molecule Sciences (BNLMS), CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China
| | - Qing-Hua Fan
- Beijing National Laboratory for Molecule Sciences (BNLMS), CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China
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Yurdacan M, Franke O, Hogen-Esch T. Nanoindentation of Films of Perfluorotridecyl, Perfluorodecyl, and Perfluoroheptyl End-Functionalized Polystyrene at the Micron Scale. MACROMOL CHEM PHYS 2016. [DOI: 10.1002/macp.201500328] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Merve Yurdacan
- Department of Chemistry and Loker; Hydrocarbon Research Institute; University of Southern California; Los Angeles CA 90089-1661 USA
| | - Oliver Franke
- Department of Aerospace and Mechanical Engineering; University of Southern California; Los Angeles CA 90089-1661 USA
| | - Thieo Hogen-Esch
- Department of Chemistry and Loker; Hydrocarbon Research Institute; University of Southern California; Los Angeles CA 90089-1661 USA
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Prajitha KP, Asha SK. The synthesis and structural characterization of twin liquid crystalline perylenebisimides. NEW J CHEM 2016. [DOI: 10.1039/c6nj00524a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A smectic to nematic LC phase switch is achieved by changing one methylene unit in the central spacer segment.
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Affiliation(s)
- K. P. Prajitha
- Polymer Science and Engineering Division
- CSIR-National Chemical Laboratory
- Pune 411008
- India
- Academy of Scientific and Innovative Research
| | - S. K. Asha
- Polymer Science and Engineering Division
- CSIR-National Chemical Laboratory
- Pune 411008
- India
- Academy of Scientific and Innovative Research
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Goel M, Narasimha K, Jayakannan M. Direct Evidence for Secondary Interactions in Planar and Nonplanar Aromatic π-Conjugates and Their Photophysical Characteristics in Solid-State Assemblies. J Phys Chem B 2015; 119:5102-12. [DOI: 10.1021/acs.jpcb.5b01956] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mahima Goel
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha
Road, Pune 411008, Maharashtra, India
| | - Karnati Narasimha
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha
Road, Pune 411008, Maharashtra, India
| | - Manickam Jayakannan
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha
Road, Pune 411008, Maharashtra, India
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Narasimha K, Jayakannan M. π-Conjugated polymer anisotropic organogel nanofibrous assemblies for thermoresponsive photonic switches. ACS APPLIED MATERIALS & INTERFACES 2014; 6:19385-19396. [PMID: 25312221 DOI: 10.1021/am505479z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The present work demonstrates one of the first examples of π-conjugated photonic switches (or photonic wave plates) based on the tailor-made π-conjugated polymer anisotropic organogel. New semicrystalline segmented π-conjugated polymers are designed with rigid aromatic oligophenylenevinylene π-core and flexible alkyl chain along the polymer backbone. These polymers are found to be self-assembled as semicrystalline or amorphous with respect to the number of carbon atoms in the alkyl units. These semicrystalline polymers produce organogels having nanofibrous morphology of 20 nm thickness with length up to 5 μm. The polymer organogel is aligned in a narrow glass capillary, and this anisotropic gel device is further demonstrated as photonic switches. The glass capillary device behaves as typical λ/4 photonic wave plates upon the illumination of the plane polarized light. The λ/4 photonic switching ability is found to be maximum at θ = 45° angle under the cross polarizers. The orthogonal arrangements of the gel capillaries produce dark and bright spots as on-and-off optical switches. Thermoreversibility of the polymer organogel (also its xerogel) was exploited to construct thermoresponsive photonic switches for the temperature window starting from 25 to 160 °C. The organic photonic switch concept can be adapted to large number of other π-conjugated materials for optical communication and storage.
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Affiliation(s)
- Karnati Narasimha
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Dr. Homi Bhabha Road, Pune 411008, Maharashtra, India
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Goel M, Narasimha K, Jayakannan M. Helical Self-Assemblies of Segmented Poly(phenylenevinylene)s and Their Hierarchical Donor–Acceptor Complexes. Macromolecules 2014. [DOI: 10.1021/ma5003112] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Mahima Goel
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha
Road, Pune 411008, Maharashtra, India
| | - Karnati Narasimha
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha
Road, Pune 411008, Maharashtra, India
| | - Manickam Jayakannan
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha
Road, Pune 411008, Maharashtra, India
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Singh H, Balamurugan A, Jayakannan M. Solid state assemblies and photophysical characteristics of linear and bent-core π-conjugated oligophenylenevinylenes. ACS APPLIED MATERIALS & INTERFACES 2013; 5:5578-5591. [PMID: 23716506 DOI: 10.1021/am400868e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
New classes of luminescent linear, bent-core, and star-shaped oligophenylenevinylenes (OPVs) having 1,4-para and 1,3-meta rigid aromatic cores were designed and developed. 3-Pentadecylphenol, a renewable resource molecule, was chosen as the flexible unit at the longitudinal or middle position of the OPV aromatic core for solid state ordering. Depending upon the nature of the π-core, the OPVs exhibited either mosaic-type liquid crystalline textures or spherulitic crystalline solids. The enthalpies of melting transitions revealed that the bent-core OPV structure showed enhanced solid state packing compared to linear or star-shaped OPVs. Small and wide-angle X-ray diffraction analysis confirmed layered-like assemblies in OPV molecules. Photophysical experiments such as excitation, emission, and time-resolved fluorescence decay dynamics were carried out to trace the molecular self-organization of OPV chromophores. Time correlated single photon counting technique (TCSPC) luminescent decay profiles and decay lifetimes (τ1 and τ2 values) revealed that the OPV chromophores showed faster exciton decay in the tightly packed bent-core structure. The weakly packed star-shaped OPV showed enhanced excited state luminescence stability up to 10 ns. A direct correlation between the OPV chemical structure, solid state ordering, and photophysical characteristics was established.
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Affiliation(s)
- Harpreet Singh
- Department of Chemistry, Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pune 411008, Maharashtra, India
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Balamurugan A, Gupta AK, Boomishankar R, Lakshmipathi Reddy M, Jayakannan M. Heavy Atom Effect Driven Organic Phosphors and Their Luminescent Lanthanide Metal-Organic Frameworks. Chempluschem 2013; 78:737-745. [DOI: 10.1002/cplu.201300121] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Indexed: 01/15/2023]
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Goel M, Jayakannan M. Herringbone and Helical Self-Assembly of π-Conjugated Molecules in the Solid State through CH/π Hydrogen Bonds. Chemistry 2012; 18:11987-93. [DOI: 10.1002/chem.201200705] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 06/11/2012] [Indexed: 11/11/2022]
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