Multidentate
pyrazolate ligands, 2-(5-tert-butylpyrazol-3-yl)-6-(diethylaminomethyl)pyridine (
H
NNN)
Et
and 2,6-bis(5-tert-butyl-1H-pyrazol-3-yl)pyridine (
H
NNN
H
), were metalated with PtII to
form neutral Pt(*NNN)EtCH3 and anionic [Y][Pt(*NNN*)CH3] (Y = Li(THF)−Cl−Li(THF)3; Y = PPN)
(* denotes that the pyrazolate N has been deprotonated). Reactions
of these PtII–CH3 complexes with acids
were investigated. Protonation occurs preferentially at the pyrazolate
site, and the release of methane requires additional acid.
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