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Chiu CF, Ho JH, Tessema E, Lu Y, Shen CR, Lin CW, Lu N. Short-Chained Platinum Complex Catalyzed Hydrosilylation under Thermomorphic Conditions: Heterogeneous Phase Separation at Ice Temperature. Molecules 2021; 26:molecules26020378. [PMID: 33450888 PMCID: PMC7828357 DOI: 10.3390/molecules26020378] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Revised: 01/08/2021] [Accepted: 01/09/2021] [Indexed: 11/16/2022] Open
Abstract
Homogeneous catalysts PtCl2[5,5'-bis-(n-ClCF2(CF2)3CH2OCH2)-2,2'-bpy] (2A) and PtCl2[5,5'-bis-(n-HCF2(CF2)3CH2OCH2)-2,2'-bpy] (2B), which contained short fluorous chains, were synthesized and used in catalysis of hydrosilylation of alkynes. In these reactions the thermomorphic mode was effectively used to recover these catalysts from the reaction mixture up to eight cycles by taking advantage of heterogeneous phase separation at ice temperature. This kind of catalysis had previously been observed in fluorous catalysts of platinum containing about 50% F-content, but in this work the percentage of F-content is decreased to only about 30%, by which we termed them as "very light fluorous". Our new type of catalyst with limited number of F-content is considered as the important discovery in the fluorous technology field as the reduced number of fluorine atoms will help to be able to comply the EPA 8-carbon rule. The metal leaching after the reaction has been examined by ICP-MS, and the testing results show the leaching of residual metal to be minimal. Additionally, comparing these results to our previous work, fluorous chain assisted selectivity has been observed when different fluorous chain lengths of the catalysts are used. It has been found that there exists fluorous chain assisted better selectivity towards β-(E) form in the Pt-catalyzed hydrosilylation of non-symmetric terminal alkyne when the Pt catalyst contains short fluorous chain (i.e., 4 Cs). Phenyl acetylenes showed the opposite regioselectivity due to pi-pi interaction while using the same catalyst via Markovnikov's addition to form terminal vinyl silane, which is then a major product for Pt-catalyzed hydrosilylation of terminal aryl acetylene with triethylsilane. Finally, the kinetic studies indicate that the insertion of alkyne into the Pt-H bond is the rate-determining step.
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Affiliation(s)
- Chiao-Fan Chiu
- Department of Pediatrics, Linkou Medical Center, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan;
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
| | - Jinn-Hsuan Ho
- Department of Chemical Engineering, National Taiwan University of Technology, Taipei 106, Taiwan;
| | - Eskedar Tessema
- Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 106, Taiwan; (E.T.); (Y.L.)
| | - Yijing Lu
- Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 106, Taiwan; (E.T.); (Y.L.)
| | - Chia-Rui Shen
- Department of Medical Biotechnology and Laboratory Sciences, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan;
- Department of Ophthalmology, Linkou Medical Center, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan
| | - Chang-Wei Lin
- Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital & Chang Gung University, Taoyuan 333, Taiwan
- Correspondence: (C.-W.L.); (N.L.)
| | - Norman Lu
- Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 106, Taiwan; (E.T.); (Y.L.)
- Development Center for Smart Textile, National Taipei University of Technology, Taipei 106, Taiwan
- Correspondence: (C.-W.L.); (N.L.)
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Hung H, Hsu C, Wu C, Wen H, Lee K. Deoxypyridinoline‐bioinspired supramolecular antibacterial salts with a C—H⋯O hydrogen‐bonded tetrameric host to construct the helical scaffold and sheet structures: The importance of rotational flexibility, anion shapes, and robust C—H⋯O hydrogen bonding. J CHIN CHEM SOC-TAIP 2020. [DOI: 10.1002/jccs.201900190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Hui‐Yu Hung
- Department of ChemistryNational Kaohsiung Normal University Kaohsiung Taiwan
| | - Ching‐I Hsu
- Department of Food ScienceFu‐Jen Catholic University New Taipei Taiwan
| | - Che‐Kai Wu
- Department of ChemistryNational Kaohsiung Normal University Kaohsiung Taiwan
| | - Hsin‐Yi Wen
- Department of ChemistryNational Kaohsiung Normal University Kaohsiung Taiwan
| | - Kwang‐Ming Lee
- Department of ChemistryNational Kaohsiung Normal University Kaohsiung Taiwan
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Barker NM, Li YX, Lee MM, Shen CR, Krause JA, Sun SS, Lu N, Connick WB, McMillin DR. Synthesis, Luminescence, and Structure of a Polymorphic Polyfluorinated Diiodoplatinum(II) Diimine Complex. Inorg Chem 2019; 58:10716-10724. [PMID: 31389696 DOI: 10.1021/acs.inorgchem.9b00669] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
PtI2(5,5'-bis(HCF2CH2OCH2)-2,2'-bpy)], 55-2FH-PtI2, is the first example of a substituted fluorinated diiodoplatinum diimine complex that exhibits polymorphism. The complex, upon recrystallization, forms two different polymorphs, denoted as α and β forms. The luminescence of the α and β forms are the same in glassy solution at 77 K; however, in the solid state, they differ significantly. The major difference between them lies in the solid-state packing of the crystalline structure. The α form is a square planar polyfluorinated PtI2-containing complex. Its extended herringbone structure consists of two neighboring stacked bipyridyl planes that do not overlap. The α form emits stronger than its parent molecule, [PtI2bpy], and much stronger than the β polymorph. The β form has a slight tetrahedral distortion about the metal center that ultimately changes the geometry of the complex and decreases the d-orbital splitting from square planar. Furthermore, overlapping bipyridine rings in the extended structure of the β form quench the emission thus resulting in a lower energy emission. Additionally, the β form shows only one type of C-H···O intermolecular stacking interaction that can cause the moderate distortion of the metal core.
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Affiliation(s)
- Nathaniel M Barker
- Department of Chemistry , University of Cincinnati , Cincinnati , Ohio 45221-0172 , United States
| | - Yu-Xuan Li
- Institute of Organic and Polymeric Materials , National Taipei University of Technology , Taipei 106 , Taiwan , Republic of China
| | - Mandy M Lee
- Institute of Chemistry , Academia Sinica , 115 Nankang , Taipei , Taiwan , Republic of China
| | - Chia-Rui Shen
- Department of Medical Biotechnology and Laboratory Sciences, College of Medicine , Chang Gung University , Taoyuan , Taiwan , Republic of China.,Department of Ophthalmology , Lin-Kou Chang Gung Memorial Hospital , Taoyuan City , Taiwan , Republic of China
| | - Jeanette A Krause
- Department of Chemistry , University of Cincinnati , Cincinnati , Ohio 45221-0172 , United States
| | - Shih-Sheng Sun
- Institute of Chemistry , Academia Sinica , 115 Nankang , Taipei , Taiwan , Republic of China
| | - Norman Lu
- Institute of Organic and Polymeric Materials , National Taipei University of Technology , Taipei 106 , Taiwan , Republic of China.,Department of Chemistry , Purdue University , 1393 Brown Building , West Lafayette , Indiana 47907-1393 , United States
| | - William B Connick
- Department of Chemistry , University of Cincinnati , Cincinnati , Ohio 45221-0172 , United States
| | - David R McMillin
- Department of Chemistry , Purdue University , 1393 Brown Building , West Lafayette , Indiana 47907-1393 , United States
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