| Abstract
| - Arylpalladium (NCN-pincer) complexes [NBu4][O3SO(CH2)nSiMe2NCNPdCl] (n = 3 (1a)and n = 6 (1b)) with a tethered sulfato group as para-substituent were synthesized. Thesenovel complexes combine an anionic sulfato group and a neutral NCN−Pd−Cl group in onemolecule. Furthermore, 1a,b were converted into their corresponding cationic Pd-aquacomplexes 9a,b, which bear both separated anionic sites and Pd cationic sites stabilized bycounterions. These mixed, zwitterionic salts can be isolated devoid of counterions to givethe pure unimolecular zwitterions [O3SO(CH2)nSiMe2NCNPd(OH2)] (n = 3 (2a) and n = 6(2b)) that aggregate in order to stabilize their ionic sites. The crystal structure of HO(CH2)6SiMe2NCNPdCl (8b) was revealed and used to study the effect of the tether group on thetype of aggregate that is formed. The crystal structure of 8b comprises a dimeric structure,which is formed via noncovalent interactions, i.e., O−H···Cl−Pd hydrogen bonds.
- Neutral and cationic NCN-pincer palladium complexes with an anionic sulfato tail were developed. The cationic complexes can be isolated either in the presence of counterions to stabilize the ionic sites or devoid of counterions in the form of discrete organometallic zwitterions.
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