Ein neuer kationischer, monohydrido-verbrückter zweikerniger Dihydridoplatin(II)-Komplex

Abstract

Eine gewinkelte PtHPt‐Gruppierung ist das besondere Strukturmerkmal des Kations (1), das überraschenderweise aus trans‐[PtH(NO3)(Et3P)2] und Na[BPh4] entsteht. Im Gegensatz zu anderen zweikernigen Platinhydriden enthält (1) keine (stabilisierenden) zweizähnigen Donorliganden.

Calibrating the coordination chemistry tool chest: metrics of bi- and tridentate ligands

“…42 More recently, Venanzi et al synthesized a series of square planar complexes of Ni II , Pd II and Pt II with more rigid spacers (transphos, 71) giving place to the trans isomer, 43 although that ligand can still adapt to form a cis complex. 44 A similar situation appears for the diphosphine ligands of type 83 (Chart 3), widely used in catalysis, which occupy either cis or trans coordination sites. Related ligands with heteroatoms in the backbone such as 89 and 90 have been also successfully applied to the formation of trans-octahedral Ru II and Mo 0 complexes.…”

Directed Positioning of Organometallic Fragments Inside a Calix[4]arene Cavity

“…The FAB mass spectrum of 4 exhibits an intense signal at m/z 1069.6 with the appropriate isotopic profile for the (4 À BF 4 ) ion. In contrast to other complexes of the type [PtH(PPh 3 )(P P)] that contain a trans-spanning diphosphane, [11] complex 5 is inert towards cis/trans isomerization in solution. [9] The above studies serve to indicate, not unsurprisingly, that the phosphane groups remain readily accessible for complexation with Ag ions; more challenging targets were then sought.…”

Cyclodextrin and phosphorus(iii): a versatile combination for coordination chemistry and catalysis

“…Diphosphine 45 was found to be the first authentic trans-spanning diphosphine since it forms neither bimetallic complexes nor polynuclear oligomers upon metal complexation, but only transchelate complexes when reacted with d 8 and d 10 cations, unlike many diphosphines that have been sold as such. [110][111][112][113][114][115] The exclusive trans-spanning character of 45 does not only originate from its rigid CD backbone combined with an ideal P⋯P separation, but also from the inability of the small α-CD cavity to host more than one small exogenous ligand such as chlorido at a time. 116 81 Complex trans-[PdMe(45)( pyridine)]BF 4 undergoes major conformational changes upon substituting pyridine with chloride, the methyl group moving out of the cavity and the chlorido ligand being captured by the receptor (Scheme 28).…”