title: New approach to the chemistry of polysulfides using diphosphanylmethanide complexes of manganese(I).
abstract: The study of the nucleophilic degradation of S8 by the methanide complex [Mn(CO)4[(PPh2)2CH]] (2) has led to the preparation of a unique class of polysulfide derivatives of formula [(CO)4Mn[(PPh2)2C-Sn-C(PPh2)2]-Mn(CO)4]. The structures of 3 (n = 6), 4 (n = 2), and 7 (n = 1) have been determined by X-ray crystallography, whereas those polysulfides with the sulfur chains S7, S5, S4, and S3 have been detected by spectroscopic methods. The polysulfides with n > 2 lose sulfur spontaneously, a process that can be accelerated by treatment with PPh3 or Na/Hg. Complexes 3, 4, and 7 were protonated at the two methanide carbon atoms to give the cationic dinuclear derivatives [(CO)4Mn[(PPh2)2C(H)-Sn-C(H)-(PPh2)2]Mn(CO)4]2+ (8, n=6; 9, n=2; 10, n = 1). The 1H NMR spectrum of 9 suggests the existence of intramolecular C-H...S interactions, in agreement with the X-ray structural determination of this complex. By treatment of 4 and 7 with one equivalent of HBF4 it is possible to selectively protonate just one methanide carbon atom, which allows the isolation of the mixed cationic derivatives R(CO)4Mn[(PPh2)2C(H)-Sn-C(PPh2)2]Mn(CO)4]+ (11, n = 2; 6, n = 1). Additionally, heterometallic complexes containing a bridging disulfide unit, of general formula [(CO)4Mn[(PPh2)2C(AuPPh3)S-SC-(AuPPh3)(PPh2)2]Mn(CO)4]2+ (12) and [(CO)4Mn[(PPh2)2C(H)S-SC(AuPPh3)-(PPh2)2]Mn(CO)4]+ (13), were prepared by reaction of 4 and 11, respectively, with [AuCl(PPh3)] in the presence of TlPF6.
authors.affiliation: Departamento de Química Orgánica e Inorgánica, Facultad de Química, Universidad de Oviedo, Spain. jruiz@sauron.quimica.uniovi.es
authors.forename: J
authors.initials: J
authors.lastname: Ruiz
authors.forename: M
authors.initials: M
authors.lastname: Ceroni
authors.forename: O V
authors.initials: OV
authors.lastname: Quinzani
authors.forename: V
authors.initials: V
authors.lastname: Riera
authors.forename: M
authors.initials: M
authors.lastname: Vivanco
authors.forename: S
authors.initials: S
authors.lastname: García-Granda
authors.forename: F
authors.initials: F
authors.lastname: Van der Maelen
authors.forename: M
authors.initials: M
authors.lastname: Lanfranchi
authors.forename: A
authors.initials: A
authors.lastname: Tiripicchio
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry; D018360:Crystallography, X-Ray; D008024:Ligands; D008345:Manganese / Q000737:chemistry*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D009943:Organophosphorus Compounds / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry*
chemical_list: D000890:Anti-Infective Agents; D008024:Ligands; D009942:Organometallic Compounds; D009943:Organophosphorus Compounds; D013440:Sulfides; D008345:Manganese; C032915:polysulfide