Transition metal complexes supported by highly basic imidazolin-2-iminato and imidazolin-2-imine N-donor ligands

Facile Access to Stable Silylium Ions Stabilized by N-Heterocyclic Imines

“…Single crystal X-ray diffraction analysis of 8 reveals that it crystallizes as a contact ion pair with the triflate anion in the solid state to form a tetrahedral silicon center with an Si-O bond distance of 1.7696(17) Å ( Figure 5). The bond angle of Si-N-C is 158.77 (17) • , which falls in the range of the mono-imino-substituted tetravalent silanes [27,29]. Furthermore, the Si-N imino bond distance (1.6231(18) Å) is comparable to those reported for tetravalent silane bearing an imino ligand and indicative of a negligible Si=N double bond character.…”

“…The Si-Nimino distance (1.6350(19) Å) is significantly shorter than the Si-NDMAP separation (1.8470(18) Å), but is very close to the Si-Nimino bond length in 6 (1.6231(18) Å). Also, the N-CNHC bond distance of 1.275(3) Å is a typical value for carbon-nitrogen double bonds in neutral imidazolin-2-imino compounds [26,27], indicating the delocalization of positive charge density into the imidazoline ring is negligible. Accordingly, instead of observing a linear Si-N-C angle in 9, the Si-N-C angle is significantly bent (155.86(17)°).…”

“…Tamm and co-workers developed a facile synthetic method for imidazolin-2-imino ligands and reported a number of metal complexes with these ligands [24][25][26][27]. During the last years, N-heterocyclic imines (NHIs) have been exploited for the syntheses of various unique main group compounds [28].…”

Crystal structure of dichlorido(1,3-bis(2,6-dimethyl-phenyl)-1H-3λ4-imidazol-2-yl)(isoquinolinyl)palladium(IV), C28H27Cl2N3Pd

“…During the past years, N-heterocyclic carbene-palladium(II) complexes bearing di erent N-containing ancillary ligands have been proven e cient catalysts in C-C and C-N coupling reactions [1,[5][6][7][8][9][10][11][12]. There are two crystallographic complex in the asymmetric unit.…”

Guanidine Metal Complexes for Bioinorganic Chemistry and Polymerisation Catalysis

“…A special class of guanidinates are the imidazolin-2-iminato ligands which have been established as powerful ancillary ligands in catalysis [5]. Guanidines have found widespread use in coordination and organic chemistry, as pharmaceuticals, sweeteners, catalysts, etc., and a multitude of synthetic approaches has been reported [6,7].…”