title: Unprecedented hybrid scorpionate/phosphine ligand able to be anchored to carbosilane dendrimers.
abstract: The synthesis of a novel hybrid pyrazolate/phosphine anionic ligand [CH2=CHCH2B(CH2PPh2)(pz)2]- is described. Coordination of this ligand to metals in a fac tridentate fashion occurs in the complexes [CH2=CHCH2B(CH2PPh2)(pz)2M(cod)], prepared by reactions of the lithium salt of the ligand with [M(mu-Cl)(cod)]2 (M=Rh, Ir). They are pentacoordinated, with the rhodium complex showing a distorted trigonal-bipyramidal structure in the solid state, as determined by X-ray diffraction methods. Furthermore, the ligand has been linked to the periphery of a carbosilane dendrimer, resulting in the polyanionic dendrimer [Li(TMED)]4[Si{(CH2)3SiMe2(CH2)3B(CH2PPh2)(pz)2}4], which leads further to the corresponding metallodendrimer with four rhodium atoms.
authors.affiliation: Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, CSIC, Universidad de Zaragoza, E-50009 Zaragoza, Spain. mcasado@unizar.es
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Casado
authors.forename: Verena
authors.initials: V
authors.lastname: Hack
authors.forename: José A
authors.initials: JA
authors.lastname: Camerano
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Ciriano
authors.forename: Cristina
authors.initials: C
authors.lastname: Tejel
authors.forename: Luis A
authors.initials: LA
authors.lastname: Oro
mesh_terms: D000838:Anions / Q000737:chemistry; D050091:Dendrimers / Q000737:chemistry*; D007495:Iridium / Q000737:chemistry; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D009943:Organophosphorus Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D010720:Phosphines / Q000737:chemistry*; D011720:Pyrazoles / Q000737:chemistry*; D012238:Rhodium / Q000737:chemistry; D012821:Silanes / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D000838:Anions; D050091:Dendrimers; D008024:Ligands; D009942:Organometallic Compounds; D009943:Organophosphorus Compounds; D010720:Phosphines; D011720:Pyrazoles; D012821:Silanes; C504072:carbosilane; D007495:Iridium; D012238:Rhodium