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Synthesis and Characterization of Catecholato Copper(II) Complexes with Sterically Hindered Neutral and Anionic N3 Type Ligands: Tris(3,5-diisopropyl-1-pyrazolyl)methane and Hydrotris(3,5-diisopropyl-1-pyrazolyl)borate

1
Department of Chemistry, Ibaraki University, Mito, Ibaraki 310-8512, Japan
2
Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
*
Author to whom correspondence should be addressed.
Received: 17 April 2020 / Revised: 7 May 2020 / Accepted: 11 May 2020 / Published: 18 May 2020
(This article belongs to the Special Issue Scorpionates: Recent Advances)
Three catecholato copper(II) complexes, [Cu(catCl4)(L1′)], [Cu(catBr4)(L1′)], and [Cu(catCl4)(L1H)], supported by sterically hindered neutral and anionic N3 type ligands: tris(3,5-diisopropyl-1-pyrazolyl)methane (referred to as L1′) and hydrotris(3,5-diisopropyl-1-pyrazolyl)borate (referred to as L1), are synthesized and characterized in detail. Their X-ray structures reveal that both [Cu(catCl4)(L1′)] and [Cu(catBr4)(L1′)] complexes have a five-coordinate square-pyramidal geometry and [Cu(catCl4)(L1H)] complex has a four-coordinate square-planar geometry. The L1H is unusual protonated ligand that controls its overall charge. For the three catecholato copper(II) complexes, the oxidation state of copper is divalent, and catechol exists in catecholate as two minus anion. This difference in coordination geometry affects their d-d and CT transitions energy and ESR parameters. View Full-Text
Keywords: copper complex; X-ray structure; catechol; non-innocent ligand; physicochemical property copper complex; X-ray structure; catechol; non-innocent ligand; physicochemical property
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MDPI and ACS Style

Fujisawa, K.; Ono, T.; Okamura, M. Synthesis and Characterization of Catecholato Copper(II) Complexes with Sterically Hindered Neutral and Anionic N3 Type Ligands: Tris(3,5-diisopropyl-1-pyrazolyl)methane and Hydrotris(3,5-diisopropyl-1-pyrazolyl)borate. Inorganics 2020, 8, 37. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8050037

AMA Style

Fujisawa K, Ono T, Okamura M. Synthesis and Characterization of Catecholato Copper(II) Complexes with Sterically Hindered Neutral and Anionic N3 Type Ligands: Tris(3,5-diisopropyl-1-pyrazolyl)methane and Hydrotris(3,5-diisopropyl-1-pyrazolyl)borate. Inorganics. 2020; 8(5):37. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8050037

Chicago/Turabian Style

Fujisawa, Kiyoshi; Ono, Tetsuya; Okamura, Moemi. 2020. "Synthesis and Characterization of Catecholato Copper(II) Complexes with Sterically Hindered Neutral and Anionic N3 Type Ligands: Tris(3,5-diisopropyl-1-pyrazolyl)methane and Hydrotris(3,5-diisopropyl-1-pyrazolyl)borate" Inorganics 8, no. 5: 37. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8050037

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