Coordination Behaviour of the New Multidentate Ligand 3,5-Bis(dimethylaminomethyl)pyridine with Palladium(II) and Platinum(II) Metal Centres

Abstract

The synthesis of the new potentially tridentate ligand 3,5-contain ligand 3 bonded to 2 metal centres by bridging through coordination of one trialkyl N donor atom and the bis(dimethylaminomethyl)pyridine (3) is described. Coordination chemistry of this ligand has been investigated with pyridinic N atom. The solid-state structure of a ligand bridged Pd dimer has been elucidated by single-crystal X-Pd II and Pt II precursor compounds. Both a bidentate bridging bonding motif and a monodentate bonding mode is obser-ray diffraction and corroborates with the solid-state IR data that suggested a trans-PdCl 2 unit was present. ved. The latter compounds incorporate 3 by coordination through the pyridinic N atom only. The former complexesEur.

Steric Promotion of Aromatic C–H Bond Activation in Primary Benzylamines

“…Commonly, such an effect is considered mation with the α-Me group in an equatorial position, as a consequence of the metal anisotropy influence. [66] [67] which contradicts the data ( 4 J HCP ϭ 5.8-6.3 Hz) reported In the case of 3a and 4a complexes, the actual shift calcufor related derivatives of the corresponding tertiary amine lated for one proton must be essentially higher (∆δ up to containing η 1 -P-bonded phosphane ligands. [60Ϫ63] 4 ppm) if one keeps in mind that each of the nine protons A valuable additional source of stereochemical inforof the tBu group spends nearly one ninth of all time in the mation is the HNϪC α H coupling.…”

Synthesis, reactivity and crystal structures of platinum (II) and platinum (IV) cyclometallated compounds derived from 2- and 4-biphenylimines

“…Seven-membered platinacycles (structures C [6] and D [7]) containing the C@N group (endo-cycles) have been recently obtained in a process involving formal insertion of a phenyl ligand into a Pt-C bond. In addition, doubly cyclometallated compounds have also been reported (structures E [8] and F [9]). Apart from examples mentioned above which contain nitrogen donor ligands, five-membered platinacycles derived from the 2,2 0 -biphenyl dianion are also an interesting class of compounds [10].…”

Divergent Behavior of Palladium(II) and Platinum(II) in the Metalation of 1,3-Di(2-pyridyl)benzene

“…There has been an increasing interest in the preparation and study of complexes containing terdentate ligands which include one metal−carbon bond, especially for the platinum metals . The variety of coordinating atoms (X) that can be used along with the possibility of having two types of coordinating structures, i .…”