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Tanner K, Marineau-Plante G, Schlachter A, Karsenti PL, Soldera A, Harvey PD. Significant differences between solid state and solution photochemistry and photophysics of mesogenic organometallic gold complexes. CAN J CHEM 2022. [DOI: 10.1139/cjc-2021-0120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Five new gold complexes 4-ROC6H4C≡CAuN≡CC6H4-4-OR′ (R/R′ = CH3/C9H19 (C1N9 ), C15H31/C9H19 (C15N9 ), C6H13/C15H31 (C6N15 ), C9H19/C15H31 (C9N15 ), C12H25/C15H31 (C12N15 )) were synthesized and characterized (1H and 13C NMR, IR, Raman spectroscopy, and high resolution mass spectrometry). Their organized smectic phases were investigated by TGA, DSC, powder XRD, and polarized light optical microscopy, and the solids are found to have crystalline and amorphous domains. No evidence for Au•••Au interactions was observed. The steady state and time-resolved absorption and emission properties at 298 and 77 K were examined, and surprisingly, the excited lifetime of the triplet excited state in the solid state is extremely short-lived (<100 ps) in comparison with the microsecond time scale recorded for the solution and at 77 K. The photosensitization of 1O2 was observed in solution but not in the solid state. The nature of the singlet (ligand-to-ligand charge transfer) and triplet (ethynyl/intraligand ππ*) excited states were assessed using DFT and TD-DFT computations. The thermal and UV-photochemical formation of gold nanoparticles were performed in solution (slow) and in the solid state (faster). The thermally generated nanoparticles are found to be larger (2–20 nm; TEM) and exhibit well-defined shapes, whereas the photochemically generated ones are smaller (1–10 nm) and show ill-defined shapes.
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Affiliation(s)
- Kevin Tanner
- Département de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
- Département de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
| | - Gabriel Marineau-Plante
- Département de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
- Département de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
| | - Adrien Schlachter
- Département de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
- Département de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
| | - Paul-Ludovic Karsenti
- Département de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
- Département de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
| | - Armand Soldera
- Département de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
- Département de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
| | - Pierre D. Harvey
- Département de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
- Département de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
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Arcau J, Ferrer M, Aguiló E, Rodríguez L. Rhodium(I) macrocyclic and cage-like structures containing diphosphine bridging ligands. TRANSIT METAL CHEM 2016. [DOI: 10.1007/s11243-016-0107-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Bhowmick S, Chakraborty S, Marri SR, Behera JN, Das N. Pyrazine-based donor tectons: synthesis, self-assembly and characterization. RSC Adv 2016. [DOI: 10.1039/c5ra21484j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Two donor tectons, each bearing a central pyrazine moiety covalently linked to two pyridine units, have been self-assembled with PtII2 acceptor units to yield ionic nanoscalar metallamacrocycles, having a convex hexagonal cavity.
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Affiliation(s)
- Sourav Bhowmick
- Department of Chemistry
- Indian Institute of Technology
- Patna
- India
| | | | - Subba R. Marri
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar 751005
- India
| | - J. N. Behera
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar 751005
- India
| | - Neeladri Das
- Department of Chemistry
- Indian Institute of Technology
- Patna
- India
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Kelgokmen Y, Zora M. Facile synthesis of heavily-substituted alkynylpyridines via a Sonogashira approach. RSC Adv 2016. [DOI: 10.1039/c5ra21701f] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
A robust synthesis of highly-substituted alkynylpyridines via a Sonogashira approach is described, providing a library of functionalized pyridines for biological studies.
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Affiliation(s)
- Yilmaz Kelgokmen
- Department of Chemistry
- Middle East Technical University
- 06800 Ankara
- Turkey
| | - Metin Zora
- Department of Chemistry
- Middle East Technical University
- 06800 Ankara
- Turkey
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