Halogen-Bonding Interactions and Electrochemical Properties of Unsymmetrical Pyrazole Pincer NiII Halides: A Peculiar Behavior of the Fluoride Complex (PCN)NiF
Autor: | Zufar N. Gafurov, Claudio Garino, Lapo Luconi, Giuliano Giambastiani, Michele R. Chierotti, Dmitry G. Yakhvarov, Paolo Cerreia Vioglio, Vladimir P. Morozov, Andrea Rossin, Il’yas F. Sakhapov, Roberto Gobetto |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
General Chemical Engineering
Halide Pyrazole 010402 general chemistry Electrochemistry 01 natural sciences Nickel pincer complexes lcsh:Chemistry chemistry.chemical_compound Metal halides Polymer chemistry Chemical Engineering (all) Halogen bond 19F NMR spectroscopy 010405 organic chemistry Chemistry Chemistry (all) General Chemistry NMR 0104 chemical sciences 3. Good health Pincer movement lcsh:QD1-999 halogen bonding Direct reaction Fluoride |
Zdroj: | ACS Omega, Vol 4, Iss 1, Pp 1118-1129 (2019) ACS omega 4 (2019): 1118–1129. doi:10.1021/acsomega.8b02452 info:cnr-pdr/source/autori:Luconi, Lapo; Garino, Claudio; Cerreia Vioglio, Paolo; Gobetto, Roberto; Chierotti, Michele R.; Yakhvarov, Dmitry; Gafurov, Zufar N.; Morozov, Vladimir; Sakhapov, Il'Yas; Rossin, Andrea; Giambastiani, Giuliano/titolo:Halogen-Bonding Interactions and Electrochemical Properties of Unsymmetrical Pyrazole Pincer NiII<%2Fsup> Halides: A Peculiar Behavior of the Fluoride Complex (PCN)NiF/doi:10.1021%2Facsomega.8b02452/rivista:ACS omega/anno:2019/pagina_da:1118/pagina_a:1129/intervallo_pagine:1118–1129/volume:4 |
Popis: | Four metal halides of the (tBuPCN)NiX family [X = F (1), Cl (2), Br (3), or I (4); PCN = 1-[3-[(di-tertbutylphosphino) methyl]phenyl]-1H-pyrazole] have been prepared through a direct reaction of the corresponding anhydrous NiX2 salts and the unsymmetrical PCN pincer ligand. Structural information from single-crystal X-ray data, 19F solution nuclear magnetic resonance, and combined electrochemical results [cyclic voltammetry (CV) and in situ electron paramagnetic resonance spectro-electrochemistry] reveal that the fluoride complex 1 is different from the other halides 2-4 in terms of electro-oxidation behavior (presence of three anodic peaks instead of one in the CV profile). 1 is also different from its symmetrical analogue (tBuPCP)NiF in terms of halogen-bonding capability toward the halogen-bond donor, iodopentafluorobenzene (C6F5I, IPFB). The positive ?S° value for the formation of the 1···IPFB adduct inferred from the van't Hoff plots is in agreement with the existence of (1·H2O) aggregates in solution, not present in 2-4. The high nucleophilicity of the fluoride ligand and the simultaneous presence of electrophilic (acidic) protons on the sidearm of the pyrazole ligand are at the origin of the observed phenomena. |
Databáze: | OpenAIRE |
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