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Antimony centre in three different roles: does donor strength or acceptor ability determine the bonding pattern?
Authors: Chlebík Richard | Fekete Csilla | Jambor Roman | Růžička Aleš | Benko Zoltan | Dostál Libor
Year: 2024
Type of publication: článek v odborném periodiku
Name of source: Dalton Transactions
Publisher name: Royal Society of Chemistry
Place: Cambridge
Page from-to: 17721-17726
Titles:
Language Name Abstract Keywords
cze Sb centrum v třech rozdílných rolích Sloučeniny obsahující atom Sb obsahující skupiny Ar(Ar = 2-[(Me2N)2CN]C6H4) byly nově připravené a charakterizované. Byly dále studovány jejich koordinační schopnosti.
eng Antimony centre in three different roles: does donor strength or acceptor ability determine the bonding pattern? A set of antimony(iii) compounds containing a ligand (Ar) with a pendant guanidine function (where Ar = 2-[(Me2N)2C 00000000 00000000 00000000 00000000 11111111 00000000 11111111 00000000 00000000 00000000 N]C6H4) was prepared and characterized. This includes triorgano-Ar3Sb, diorgano-Ar2SbCl and monoorgano-ArSbCl2 compounds and they were characterized by 1H and 13C NMR spectroscopy and by single-crystal X-ray diffraction analysis (sc-XRD). The coordination capability of Ar3Sb and Ar2SbCl was examined in the reactions with either cis-[PdCl2(CH3CN)2] or PtCl2 and complexes cis-[(kappa 2-Sb,N-Ar3Sb)MCl2] (M = Pd 1, Pt 2) and [(kappa 3-N,Sb,N-Ar2SbCl)MCl2] (M = Pd 3, Pt 4) were isolated, while their structures were determined by sc-XRD. Notably, the ligands Ar3Sb and Ar2SbCl exhibit different coordination modes - bidentate and tridentate, respectively - and the antimony exhibits three distinct bonding modes in complexes 1-4, which were also subjected to theoretical studies. The guanidine substituted organostibines allowed remarkable coordination variability including three distinct modes of M & ctdot;Sb bonding (M = Pd or Pt), i.e. Sb -> M L-type and Z-type interactions involving M <- Sb donation and M -> Sb backdonation. coordination non-innocence; z-type ligands; rhodium(i) complexes; solution behavior; dinuclear core; stibine; metal; chemistry; reactivity; nickel

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