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Kirk S. Schanze - One of the best experts on this subject based on the ideXlab platform.
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Intramolecular triplet energy transfer in anthracene-based platinum Acetylide oligomers.
The journal of physical chemistry. B, 2013Co-Authors: Muhammet E. Köse, Kirk S. SchanzeAbstract:Platinum Acetylide oligomers that contain an anthracene moiety have been synthesized and subjected to photophysical characterization. Spectroscopic measurement and DFT calculations reveal that both the singlet and triplet energy levels of the anthracene segment are lower than those of the platinum Acetylide segment. Thus, the platinum Acetylide segment acts as a sensitizer to populate the triplet state of the anthrancene segment via intramolecular triplet–triplet energy transfer. The objective of this work is to understand the mechanisms of energy-transfer dynamics in these systems. Fluorescence quenching and the dominant triplet absorption that arises from the anthracene segment in the transient absorption spectrum of Pt4An give clear evidence that energy transfer adopts an indirect mechanism, which begins with singlet–triplet energy transfer from the anthracene segment to the platinum Acetylide segment followed by triplet–triplet energy transfer to the anthracene segment.
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Intramolecular Triplet Energy Transfer in Anthracene-Based Platinum Acetylide Oligomers B
The Journal of Physical Chemistry, 2013Co-Authors: Muhammete. Köse, Kirk S. SchanzeAbstract:Platinum Acetylide oligomers that contain an anthracene moiety have been synthesized and subjected to photophysical characterization. Spectroscopic measurement and DFT calculations reveal that both the singlet and triplet energy levels of the anthracene segment are lower than those of the platinum Acetylide segment. Thus, the platinum Acetylide segment acts as a sensitizer to populate the triplet state of the anthrancene segment via intramolecular triplet–triplet energy transfer. The objective of this work is to understand the mechanisms of energy-transfer dynamics in these systems. Fluorescence quenching and the dominant triplet absorption that arises from the anthracene segment in the transient absorption spectrum of Pt4An give clear evidence that energy transfer adopts an indirect mechanism, which begins with singlet–triplet energy transfer from the anthracene segment to the platinum Acetylide segment followed by triplet–triplet energy transfer to the anthracene segment.
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a fulleropyrrolidine end capped platinum Acetylide triad the mechanism of photoinduced charge transfer in organometallic photovoltaic cells
Physical Chemistry Chemical Physics, 2007Co-Authors: Fengqi Guo, Young-gi Kim, John R Reynolds, Katsu Ogawa, Evgeny O Danilov, Felix N Castellano, Kirk S. SchanzeAbstract:The fullerene end-capped platinum Acetylide donor–acceptor triad Pt2ThC60 was synthesized and characterized by using photophysical methods and photovoltaic device testing. The triad consists of the platinum Acetylide oligomer Ph––Pt(PBu3)2––Th––Pt(PBu3)2––Ph (Ph = phenyl and Th = 2,5-thienyl, stereochemistry at both Pt centers is trans) that contains fulleropyrrolidine moieties on each of the terminal phenylene units. Electrochemistry of the triad reveals relatively low potential oxidation and reduction waves corresponding, respectively, to oxidation of the platinum Acetylide and reduction of the fulleropyrrolidine units. Photoluminescence spectroscopy shows that the singlet and triplet states of the platinum Acetylide chromophore are strongly quenched in the triad assembly, both in solution at ambient temperature as well as in a low-temperature solvent glass. The excited state quenching arises due to intramolecular photoinduced electron transfer to produce a charge separated state based on charge transfer from the platinum Acetylide (donor) to the fulleropyrrolidine (acceptor). Picosecond time resolved absorption spectroscopy confirms that the charge transfer state is produced within 1 ps of photoexcitation, and it decays by charge recombination within 400 ps. Organic photovoltaic devices fabricated using spin-coated films of Pt2ThC60 as the active material operate with modest efficiency, exhibiting a short circuit photocurrent of 0.51 mA cm−2 and an open circuit voltage of 0.41 V under 100 mW cm−2/AM1.5 illumination. The results are discussed in terms of the relationship between the mechanism of photoinduced electron transfer in the triad and the comparatively efficient photovoltaic response exhibited by the material.
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Platinum–Acetylide polymer based solar cells: involvement of the triplet state for energy conversion
Chemical communications (Cambridge England), 2006Co-Authors: Fengqi Guo, Young-gi Kim, John R Reynolds, Kirk S. SchanzeAbstract:Relatively efficient photovoltaic devices were fabricated using blends of a phosphorescent platinum–Acetylide polymer and a fullerene (PCBM); involvement of the triplet excited state of the platinum–Acetylide polymer in photoinduced charge transfer is believed to contribute to the device efficiency.
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Platinum-Acetylide polymer based solar cells: involvement of the triplet state for energy conversion.
Chemical communications (Cambridge England), 2006Co-Authors: Fengqi Guo, Young-gi Kim, John R Reynolds, Kirk S. SchanzeAbstract:Relatively efficient photovoltaic devices were fabricated using blends of a phosphorescent platinum-Acetylide polymer and a fullerene (PCBM); involvement of the triplet excited state of the platinum-Acetylide polymer in photoinduced charge transfer is believed to contribute to the device efficiency.
Hai-bo Yang - One of the best experts on this subject based on the ideXlab platform.
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our expedition in linear neutral platinum Acetylide complexes the preparation of micro nanostructure materials complicated topologies and dye sensitized solar cells
Chemical Record, 2016Co-Authors: Hai-bo YangAbstract:During the past few decades, the construction of various kinds of platinum-Acetylide complexes has attracted considerable attention, because of their wide applications in photovoltaic cells, non-linear optics, and bio-imaging materials. Among these platinum-Acetylide complexes, the linear neutral platinum-Acetylide complexes, due to their attractive properties, such as well-defined linear geometry, synthetic accessibility, and intriguing photoproperties, have emerged as a rising star in this field. In this personal account, we will discuss how we entered the field of linear neutral platinum-Acetylide chemistry and what we found in this field. The preparation of various types of linear neutral platinum-Acetylide complexes and their applications in the areas of micro/nanostructure materials, complicated topologies, and dye-sensitized solar cells will be summarized in this account.
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linear neutral platinum Acetylide moiety beyond the links
Chemical Communications, 2014Co-Authors: Wei Wang, Hai-bo YangAbstract:In this feature article, brief highlights of research progress on the linear neutral platinum–Acetylide moiety, trans-Pt(PR3)2(CCR′)2, are presented. Due to its unique characteristics such as the well-defined linear geometry, synthetic accessibility, and intriguing photoproperties, this type of platinum–Acetylide moiety has been extensively investigated in many respects from supramolecular chemistry to materials science during the past two decades. However, compared with the extensively studied charged platinum–Acetylide complexes, the linear neutral platinum–Acetylide moiety has been less reviewed. Based upon our recent progress in platinum chemistry, we provide herein a brief review on the linear neutral platinum–Acetylide building block. This feature article will focus on its role as a linkage building block, but beyond the links. Three aspects including complex architectures composed of platinum–Acetylide links, platinum–Acetylide bridged multichromophoric arrays, and supramolecular self-assembly of platinum–Acetylide building blocks are discussed.
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Linear neutral platinum–Acetylide moiety: beyond the links
Chemical communications (Cambridge England), 2013Co-Authors: Wei Wang, Hai-bo YangAbstract:In this feature article, brief highlights of research progress on the linear neutral platinum–Acetylide moiety, trans-Pt(PR3)2(CCR′)2, are presented. Due to its unique characteristics such as the well-defined linear geometry, synthetic accessibility, and intriguing photoproperties, this type of platinum–Acetylide moiety has been extensively investigated in many respects from supramolecular chemistry to materials science during the past two decades. However, compared with the extensively studied charged platinum–Acetylide complexes, the linear neutral platinum–Acetylide moiety has been less reviewed. Based upon our recent progress in platinum chemistry, we provide herein a brief review on the linear neutral platinum–Acetylide building block. This feature article will focus on its role as a linkage building block, but beyond the links. Three aspects including complex architectures composed of platinum–Acetylide links, platinum–Acetylide bridged multichromophoric arrays, and supramolecular self-assembly of platinum–Acetylide building blocks are discussed.
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design and preparation of platinum Acetylide organogelators containing ethynyl pyrene moieties as the main skeleton
Chemistry: A European Journal, 2012Co-Authors: Jing Zhang, Li-jun Chen, De-xian Wang, Hai-bo YangAbstract:A series of new platinum-Acetylide complexes containing ethynyl-pyrene moieties as the main skeleton were synthesized and characterized. The investigation of the absorption and emission spectra of these complexes revealed that the extension of the molecular size with the introduction of different numbered platinum-Acetylide fragments can efficiently tune the absorption and emission bands from the UV to the longer wavelength region. Moreover, the gelation properties of these complexes were investigated by the "stable-to-inversion-of-a-test-tube" method. Most newly designed platinum-Acetylide compounds presented a stable gel-formation property in some of the tested solvents. The morphology of the xerogels was investigated by scanning electron microscopy (SEM). Furthermore, the concentration- and temperature-dependent absorption and emission properties of these complexes were investigated, which support the formation of J-type assemblies during the aggregation process. More importantly, it was found that the complexes 4 a-C6, 4 a, and 4 a-C18 with four platinum-Acetylide fragments presented potential applications as luminescent organometallic gels.
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Design and Preparation of Platinum–Acetylide Organogelators Containing Ethynyl–Pyrene Moieties as the Main Skeleton
Chemistry (Weinheim an der Bergstrasse Germany), 2012Co-Authors: Jing Zhang, Li-jun Chen, De-xian Wang, Hai-bo YangAbstract:A series of new platinum-Acetylide complexes containing ethynyl-pyrene moieties as the main skeleton were synthesized and characterized. The investigation of the absorption and emission spectra of these complexes revealed that the extension of the molecular size with the introduction of different numbered platinum-Acetylide fragments can efficiently tune the absorption and emission bands from the UV to the longer wavelength region. Moreover, the gelation properties of these complexes were investigated by the "stable-to-inversion-of-a-test-tube" method. Most newly designed platinum-Acetylide compounds presented a stable gel-formation property in some of the tested solvents. The morphology of the xerogels was investigated by scanning electron microscopy (SEM). Furthermore, the concentration- and temperature-dependent absorption and emission properties of these complexes were investigated, which support the formation of J-type assemblies during the aggregation process. More importantly, it was found that the complexes 4 a-C6, 4 a, and 4 a-C18 with four platinum-Acetylide fragments presented potential applications as luminescent organometallic gels.
Fengqi Guo - One of the best experts on this subject based on the ideXlab platform.
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a fulleropyrrolidine end capped platinum Acetylide triad the mechanism of photoinduced charge transfer in organometallic photovoltaic cells
Physical Chemistry Chemical Physics, 2007Co-Authors: Fengqi Guo, Young-gi Kim, John R Reynolds, Katsu Ogawa, Evgeny O Danilov, Felix N Castellano, Kirk S. SchanzeAbstract:The fullerene end-capped platinum Acetylide donor–acceptor triad Pt2ThC60 was synthesized and characterized by using photophysical methods and photovoltaic device testing. The triad consists of the platinum Acetylide oligomer Ph––Pt(PBu3)2––Th––Pt(PBu3)2––Ph (Ph = phenyl and Th = 2,5-thienyl, stereochemistry at both Pt centers is trans) that contains fulleropyrrolidine moieties on each of the terminal phenylene units. Electrochemistry of the triad reveals relatively low potential oxidation and reduction waves corresponding, respectively, to oxidation of the platinum Acetylide and reduction of the fulleropyrrolidine units. Photoluminescence spectroscopy shows that the singlet and triplet states of the platinum Acetylide chromophore are strongly quenched in the triad assembly, both in solution at ambient temperature as well as in a low-temperature solvent glass. The excited state quenching arises due to intramolecular photoinduced electron transfer to produce a charge separated state based on charge transfer from the platinum Acetylide (donor) to the fulleropyrrolidine (acceptor). Picosecond time resolved absorption spectroscopy confirms that the charge transfer state is produced within 1 ps of photoexcitation, and it decays by charge recombination within 400 ps. Organic photovoltaic devices fabricated using spin-coated films of Pt2ThC60 as the active material operate with modest efficiency, exhibiting a short circuit photocurrent of 0.51 mA cm−2 and an open circuit voltage of 0.41 V under 100 mW cm−2/AM1.5 illumination. The results are discussed in terms of the relationship between the mechanism of photoinduced electron transfer in the triad and the comparatively efficient photovoltaic response exhibited by the material.
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Platinum–Acetylide polymer based solar cells: involvement of the triplet state for energy conversion
Chemical communications (Cambridge England), 2006Co-Authors: Fengqi Guo, Young-gi Kim, John R Reynolds, Kirk S. SchanzeAbstract:Relatively efficient photovoltaic devices were fabricated using blends of a phosphorescent platinum–Acetylide polymer and a fullerene (PCBM); involvement of the triplet excited state of the platinum–Acetylide polymer in photoinduced charge transfer is believed to contribute to the device efficiency.
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Platinum-Acetylide polymer based solar cells: involvement of the triplet state for energy conversion.
Chemical communications (Cambridge England), 2006Co-Authors: Fengqi Guo, Young-gi Kim, John R Reynolds, Kirk S. SchanzeAbstract:Relatively efficient photovoltaic devices were fabricated using blends of a phosphorescent platinum-Acetylide polymer and a fullerene (PCBM); involvement of the triplet excited state of the platinum-Acetylide polymer in photoinduced charge transfer is believed to contribute to the device efficiency.
Hongmei Sun - One of the best experts on this subject based on the ideXlab platform.
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Polymerization of substituted acetylenes carrying non-polar and polar groups with transition metal Acetylide catalysts
Macromolecular Rapid Communications, 2001Co-Authors: Xiaowei Zhan, Mujie Yang, Hongmei SunAbstract:A new series of single-component air-stable transition metal Acetylide catalysts for the polymerization of substituted acetylenes carrying non-polar and polar groups was developed. The catalytic properties of transition metal Acetylides are related to transition metals, phosphines and acetylenic ligands. Nickel Acetylides show higher catalytic activity towards the polymerization of substituted acetylenes containing non-polar groups, while palladium Acetylides show higher catalytic activity towards the polymerization of substituted acetylenes carrying polar groups. Palladium Acetylides with PPh 3 ligand are efficient catalysts for the polymerization of substituted acetylenes bearing both non-polar and polar groups.
Young-gi Kim - One of the best experts on this subject based on the ideXlab platform.
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a fulleropyrrolidine end capped platinum Acetylide triad the mechanism of photoinduced charge transfer in organometallic photovoltaic cells
Physical Chemistry Chemical Physics, 2007Co-Authors: Fengqi Guo, Young-gi Kim, John R Reynolds, Katsu Ogawa, Evgeny O Danilov, Felix N Castellano, Kirk S. SchanzeAbstract:The fullerene end-capped platinum Acetylide donor–acceptor triad Pt2ThC60 was synthesized and characterized by using photophysical methods and photovoltaic device testing. The triad consists of the platinum Acetylide oligomer Ph––Pt(PBu3)2––Th––Pt(PBu3)2––Ph (Ph = phenyl and Th = 2,5-thienyl, stereochemistry at both Pt centers is trans) that contains fulleropyrrolidine moieties on each of the terminal phenylene units. Electrochemistry of the triad reveals relatively low potential oxidation and reduction waves corresponding, respectively, to oxidation of the platinum Acetylide and reduction of the fulleropyrrolidine units. Photoluminescence spectroscopy shows that the singlet and triplet states of the platinum Acetylide chromophore are strongly quenched in the triad assembly, both in solution at ambient temperature as well as in a low-temperature solvent glass. The excited state quenching arises due to intramolecular photoinduced electron transfer to produce a charge separated state based on charge transfer from the platinum Acetylide (donor) to the fulleropyrrolidine (acceptor). Picosecond time resolved absorption spectroscopy confirms that the charge transfer state is produced within 1 ps of photoexcitation, and it decays by charge recombination within 400 ps. Organic photovoltaic devices fabricated using spin-coated films of Pt2ThC60 as the active material operate with modest efficiency, exhibiting a short circuit photocurrent of 0.51 mA cm−2 and an open circuit voltage of 0.41 V under 100 mW cm−2/AM1.5 illumination. The results are discussed in terms of the relationship between the mechanism of photoinduced electron transfer in the triad and the comparatively efficient photovoltaic response exhibited by the material.
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Platinum–Acetylide polymer based solar cells: involvement of the triplet state for energy conversion
Chemical communications (Cambridge England), 2006Co-Authors: Fengqi Guo, Young-gi Kim, John R Reynolds, Kirk S. SchanzeAbstract:Relatively efficient photovoltaic devices were fabricated using blends of a phosphorescent platinum–Acetylide polymer and a fullerene (PCBM); involvement of the triplet excited state of the platinum–Acetylide polymer in photoinduced charge transfer is believed to contribute to the device efficiency.
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Platinum-Acetylide polymer based solar cells: involvement of the triplet state for energy conversion.
Chemical communications (Cambridge England), 2006Co-Authors: Fengqi Guo, Young-gi Kim, John R Reynolds, Kirk S. SchanzeAbstract:Relatively efficient photovoltaic devices were fabricated using blends of a phosphorescent platinum-Acetylide polymer and a fullerene (PCBM); involvement of the triplet excited state of the platinum-Acetylide polymer in photoinduced charge transfer is believed to contribute to the device efficiency.
