Synthesis and 31P nuclear magnetic resonance studies of trinuclear palladium cluster complexes; X-ray structure of [Pd3Cl(PPh2)2(PEt3)3][BF4]

Abstract

Complexes [Pd3X(PPh,),(PR,),] [BF,] (X = C1, Br, or SCF,; R = Ph or Et), which are the first examples of trinuclear palladium clusters in an oxidation state other than zero, have been synthesised and characterised by 31P n.m.r. spectroscopy and, in the case of (X = C1, R = Et) (I), by X-ray diffraction.

Organometallic complexes with metal-metal bonds. 18. Syntheses of tetrametallic planar, triangulated mixed-metal palladium clusters. X-ray crystal structures of Pd2M2(.eta.5-C5H5)2(.mu.3-CO)2(.mu.2-CO)4(PEt3)2 with M = Cr, Mo, and W

“…The phosphine ligands are linearly coordinated to the palladium atoms with an average Pd'-Pd-P angle of 177.5°( Figure 1). The average Pd-P distance of 2.338 Á is normal and compares well with that found in 36 The conformation of the ethyl groups is similar in the three structures, with two C2H5 chains of each phosphine bending toward the core of the cluster and the third one in the opposite direction (Figure 1).…”

Novel reactions of metal-metal bonds. Insertion of isocyanides and carbon monoxide into the palladium-palladium bond of some palladium(I) dimers

“…and Pt(I) complexes which have two directly bonded, 16electron, planar metal ions9-17 and a number of tripalladium or triplatinum complexes which may contain linear19 or triangular M3 units. [19][20][21][22][23][24] Details of a new preparative route to 1 ( = Pd), exchange of its axial anions, and reactions with carbon monoxide and isocyanides are reported here.…”

The coordination chemistry of enantiopure diimines derived from 1-phosphanorbornadiene-2-carboxaldehydes

“…Both palladium atoms have geometries close to square planar: the sum of the angles at Pd 1 is 359.95°and the sum of the angles at Pd 2 359.5°T he two planes are almost parallel and the two palladium atoms are located one above the other: the angles L-Pd 1 -Pd 2 are in the range 84.93(3)-95.67(4)°and the angles LPd 2 -Pd 1 in the range 87.8(1)-95.35(3)°. At 3.1787(5) Å , the distance between the two palladium atoms is too long for a genuine bond, but, obviously, a significant coulombic interaction does exist (Pd-Pd bonds as long as 2.93 Å have been recorded in the literature [6]). Quite expectedly, the longest Pd-Cl bond is trans to P 1 (2.366(1) Å ), and the shortest trans to N 2 (2.292(1) Å ).…”