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• W2093673776 abstract "The synthesis and spectroscopic characterization (IR, 1 H and 13 C NMR) of new Ag(I){HB(3,5-Me 2 pz) 3 }, {HB(3,5-Ph 2 pz) 3 }, {B(pz) 4 } and {B(3-Mepz) 4 } complexes (pzH=pyrazole) containing tert-butylisocyanide (CNBu t ) or cyclohexylisocyanide (CNCy) ligands are reported. 1:1:1 Complexes of formula [Ag{H n B(pz) 4− n }(CNR)] ( n =0 or 1, R=Cy or Bu t ) have been generally obtained independently from the conditions of reaction employed, with the exception of a 1:1:2 compound [Ag{B(3-Mepz) 4 }(CNCy) 2 ], obtained when an equimolar ratio of [B(3-Mepz) 4 ]K, Ag(O 3 SCF 3 ) and CNCy was employed. No derivative was obtained when {HB(pz) 3 } − and {H 2 B(pz) 2 } − were employed as the anionic ligands. The [Ag{HB(3,5-Me 2 pz) 3 }(CNBu t )], [Ag{HB(3,5-Me 2 pz) 3 }(CNCy)] and [Ag{HB(3,5-Ph 2 pz) 3 }(CNBu t )] complexes have been isolated in crystalline form and characterized by using X-ray crystallography. These three compounds are all unsolvated mononuclear arrays, with tridentate N 3 -tris(pyrazolyl)borate ligands and unidentate CNR making up the four coordinate environment of the silver atom. The derivatives of {B(3-Mepz) 4 } − and {B(pz) 4 } − exhibit a fluxional behavior in solution with a pyrazolyl ring exchange process occurring rapidly even at 218 K. The stability of all of these new compounds can be rationalized as a function of both steric and electronic properties of the poly(pyrazol-1-yl)borate ligand. From the reaction of [Ag{B(3-MePz) 4 }(CNCy) 2 ] with 1-methylimidazoline-2-thione (Hmimt), the polynuclear compound [Ag(mimt)] n was obtained, whereas from the reaction of [Ag{B(3-MePz) 4 }(CNCy) 2 ] with imidazole (ImH) the mixed ligand complex [Ag{B(3-MePz) 4 }(ImH)(CNCy)] was afforded. The ImH ligand is also able to displace the CNBu t from [Ag{B(Pz) 4 }(CNBu t )] yielding the [Ag{B(Pz) 4 }(ImH)] derivative." @default.
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• W2093673776 date "2000-02-01" @default.
• W2093673776 modified "2023-10-03" @default.
• W2093673776 title "Synthesis, structural and spectroscopic characterization of new silver(I) poly(pyrazolyl)borate complexes containing isonitrile ligands" @default.
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• W2093673776 doi "https://doi.org/10.1016/s0020-1693(99)00428-4" @default.
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