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Tris(pyrazolyl)methane Ligands: Syntheses and Structures of Monometallic and Metallodendritic Complexes
Author(s) -
SánchezMéndez Alberto,
Silvestri Gustavo F.,
de Jesús Ernesto,
de la Mata F. Javier,
Flores Juan C.,
Gómez Rafael,
GómezSal Pilar
Publication year - 2004
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200400162
Subject(s) - chemistry , denticity , ligand (biochemistry) , palladium , crystallography , stereochemistry , tris , medicinal chemistry , crystal structure , catalysis , organic chemistry , biochemistry , receptor
Abstract The substituted ligands Me 3 SiC(pz) 3 ( 1 ) and Me 3 SiOCH 2 C(pz) 3 ( 2 ) have been prepared starting from HC(pz) 3 and HOCH 2 C(pz) 3 . The molecular structure of compound 1 has been determined by X‐ray diffraction studies, which show a propeller‐like conformation of the pyrazolyl rings. Compound 2 has been found to be useful for the synthesis of [Mo(CO) 3 {Me 3 SiOCH 2 C(pz) 3 }] ( 3 ), [TiCl 2 (N t Bu){Me 3 SiOCH 2 C(pz) 3 }] ( 4 ), and [PdCl 2 {Me 3 SiOCH 2 C(pz) 3 }] ( 5 ), through ligand exchange reactions. The characterization of the new complexes is compatible with a tridentate coordination of the ligands in complexes 3 and 4 , and a bidentate coordination in 5 as confirmed by an X‐ray analysis carried out with the palladium complex. The procedure has been extended for the synthesis of the carbosilane G1−[OCH 2 C(pz) 3 ] 4 ( 6 ) and the tetrametallic compound G1−[OCH 2 C(pz) 3 Mo(CO) 3 ] 4 ( 7 ) (G1 = Si(CH 2 CH 2 CH 2 Me 2 Si) 4 −). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)