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Behnia A, Fard MA, Blacquiere JM, Puddephatt RJ. Hydroxopalladium(IV) complexes prepared using oxygen or hydrogen peroxide as oxidants. Dalton Trans 2024; 53:10901-10911. [PMID: 38885094 DOI: 10.1039/d4dt01202j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
The cycloneophylpalladium(II) complexes [Pd(CH2CMe2C6H4)(κ2-N,N'-L)], 1 or 2, with L = RO(CH2)3N(CH2-2-C5H4N)2, with R = H or Me, respectively, react with either dioxygen or hydrogen peroxide in the presence of NH4[PF6] to give rare examples of the corresponding hydroxopalladium(IV) complexes [Pd(OH)(CH2CMe2C6H4)(κ3-N,N',N''-L)][PF6], 3 or 4. The complexes 3 and 4 are stable at room temperature and have been structurally characterized. On heating a solution of 3 or 4 in moist dimethylsulphoxide, selective reductive elimination with C(sp2)-O bond formation is observed, followed by hydrolysis, to give the corresponding pincer complex [Pd(OH)(κ3-N,N',N''-L)][PF6] and 2-t-butylphenol as major products. A more complex reaction occurs in chloroform solution. The mechanisms of reaction are discussed, supported by DFT calculations.
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Affiliation(s)
- Ava Behnia
- Department of Chemistry, University of Western Ontario, London, Canada N6A 5B7.
| | - Mahmood A Fard
- Department of Chemistry, University of Western Ontario, London, Canada N6A 5B7.
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Zhou MY, Yu ZS, Deng W, Lu HL, Niu XF, Tong J, Yu SY, Fujita M. [M 8L 4] 8+-Type Squares Self-Assembled by Dipalladium Corners and Bridging Aromatic Dipyrazole Ligands for Iodine Capture. Inorg Chem 2023. [PMID: 37320970 DOI: 10.1021/acs.inorgchem.3c00893] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Square-like metallamacrocyclic palladium(II) complexes [M8L4]8+ (1-7) were synthesized by reacting aromatic dipyrazole ligands (H2L1-H2L3 with pyromellitic arylimide-, 1,4,5,8-naphthalenetetracarboxylic arylimide-, and anthracene-based aromatic groups, respectively) with dipalladium corners ([(bpy)2Pd2(NO3)2](NO3)2, [(dmbpy)2Pd2(NO3)2](NO3)2, or [(phen)2Pd2(NO3)2](NO3)2, where bpy = 2,2'-bipyridine, dmbpy = 4,4'-dimethyl-2,2'-bipyridine, and phen = 1,10-phenanthroline) in aqueous solutions via metal-directed self-assembly. Metallamacrocycles 1-7 were fully characterized by 1H and 13C nuclear magnetic resonance spectroscopy and electrospray ionization mass spectrometry, and the square structure of 7·8NO3- was further confirmed via single crystal X-ray diffraction. These square-like metallamacrocycles exhibit effective performance for iodine adsorption.
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Affiliation(s)
- Meng-Ying Zhou
- Center of Excellence for Environmental Safety and Biological Effects, Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Zheng-Su Yu
- Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Wei Deng
- Center of Excellence for Environmental Safety and Biological Effects, Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Hong-Lin Lu
- Center of Excellence for Environmental Safety and Biological Effects, Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Xiao-Fei Niu
- Center of Excellence for Environmental Safety and Biological Effects, Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Jin Tong
- Center of Excellence for Environmental Safety and Biological Effects, Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Shu-Yan Yu
- Center of Excellence for Environmental Safety and Biological Effects, Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Makoto Fujita
- Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Nakamura T, Feng RY, Nabeshima T. A Sandwich‐Shaped Hexanuclear Silver Complex with a Giant Cavity Constructed from a Macrocycle with Inward Chelating Units. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000882] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Takashi Nakamura
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305–8571 Japan
| | - Rui Yun Feng
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305–8571 Japan
| | - Tatsuya Nabeshima
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305–8571 Japan
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Preston D, Kruger PE. Using Complementary Ligand Denticity to Direct Metallosupramolecular Structure about Metal Ions with Square‐Planar Geometry. Chempluschem 2020; 85:454-465. [DOI: 10.1002/cplu.202000019] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 02/05/2020] [Indexed: 01/30/2023]
Affiliation(s)
- Dan Preston
- MacDiarmid Institute for Advanced Materials and Nanotechnology School of Physical and Chemical SciencesUniversity of Canterbury Christchurch 8041 New Zealand
| | - Paul E. Kruger
- MacDiarmid Institute for Advanced Materials and Nanotechnology School of Physical and Chemical SciencesUniversity of Canterbury Christchurch 8041 New Zealand
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Behnia A, Fard MA, Blacquiere JM, Puddephatt RJ. Mild and selective Pd-Ar protonolysis and C-H activation promoted by a ligand aryloxide group. Dalton Trans 2018; 47:3538-3548. [PMID: 29435552 DOI: 10.1039/c8dt00437d] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A bidentate nitrogen-donor ligand with an appended phenol group, C5H4NCH[double bond, length as m-dash]N-2-C6H4OH, H(L1) was treated with a palladium cycloneophyl complex [Pd(CH2CMe2C6H4)(COD)], with both Pd-aryl and Pd-alkyl bonds, to give a Pd-alkyl complex, [Pd(CH2CMe2C6H5)(κ3-N,N',O-OC6H4N[double bond, length as m-dash]CH(2-C5H4N))], 1. The cleavage of the Pd-aryl bond and the deprotonation of the ligand phenol to afford a bound aryloxide, indicates facile Pd-aryl bond protonolysis. Deuterium labelling experiments confirmed that the ligand phenol promotes protonolysis and that the reverse, aryl C-H activation, occurs under very mild reaction conditions (within 10 min at room temperature). An unusual isomerization of the Pd-alkyl complex 1 to a Pd-aryl complex, [Pd(C6H4(2-t-Bu))(κ3-N,N',O-OC6H4N[double bond, length as m-dash]CH(2-C5H4N))], 2, was observed to give an equilibrium with [2]/[1] = 9 after 5 days in methanol. The isomerization requires that both aryl C-H activation and Pd-alkyl protonolysis steps occur. The very large KIE value (kH/kD = ca. 40) for isomerization of 1 to 2, suggests a concerted SE2-type mechanism for the Pd-alkyl protonolysis step.
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Affiliation(s)
- Ava Behnia
- Department of Chemistry, University of Western Ontario, London, Canada N6A 5B7.
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Behnia A, Fard MA, Blacquiere JM, Puddephatt RJ. Reactivity of a Palladacyclic Complex: A Monodentate Carbonate Complex and the Remarkable Selectivity and Mechanism of a Neophyl Rearrangement. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00631] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ava Behnia
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Mahmood A. Fard
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Johanna M. Blacquiere
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Richard J. Puddephatt
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
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Laramée-Milette B, Zaccheroni N, Palomba F, Hanan GS. Visible and Near-IR Emissions from k
2
N
- and k
3
N
-Terpyridine Rhenium(I) Assemblies Obtained by an [n
×1] Head-to-Tail Bonding Strategy. Chemistry 2017; 23:6370-6379. [DOI: 10.1002/chem.201700077] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Indexed: 12/31/2022]
Affiliation(s)
- Baptiste Laramée-Milette
- Département de Chimie; Université de Montréal; 5150 Ch. de la Rampe, Pavillon J.-A. Bombardier Montréal QC H3T 2B1 Canada
| | - Nelsi Zaccheroni
- Dipartimento di Chimica, “Giacomo Ciamician”; Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Francesco Palomba
- Dipartimento di Chimica, “Giacomo Ciamician”; Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Garry S. Hanan
- Département de Chimie; Université de Montréal; 5150 Ch. de la Rampe, Pavillon J.-A. Bombardier Montréal QC H3T 2B1 Canada
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