Synthesis and characterization of di-.mu.-thiocyanatobis[hydrogen bis(diphenylphosphinato)]dipalladium (II). Complex containing a novel symmetrically hydrogen-bonded anion

Assessment of the Electronic Properties of P ligands Stemming from Secondary Phosphine Oxides

“…The 1 H NMR spectra of 5 H , which featured a singlet at 3.65 ppm, supported the presence of the bridging H. We also performed an X‐ray diffraction study on a single crystal of 5 H (Figure 5). 38 Despite the difficulty to locate the hydrogen atoms, the nature of 5 H was confirmed by the short OO distance of 2.43 pm, as well as the coplanarity of the metal, the two phosphorus atoms and the two oxygens, which are characteristic of bidentate ligands of type d 39…”

Anionic phosph(in)ito (“phosphoryl”) ligands: Non-classical “actor” phosphane-type ligands in coordination chemistry

“…2), and some of their corresponding complexes have been exploited in catalysis [35,88]. The synthesis of these bidentate O−anionic  1 -P−phosph(in)ito ligands can be accomplished by reaction of metal complexes with phosphane oxides [36,[89][90][91][92][93] or mixed anhydrides of phosphinous and acrylic acids [94], by solvolysis of acetylenic phosphane [95], phosphazane [96], chlorophosphane [97] or phosphinite [98,99] complexes, or by treatment of suitable precursors with chlorophosphanes in protic solvents [100][101][102][103]. Deprotonation with an appropriate base of the cis-configured monoanion complex 32, featuring the quasichelating phosphinous acid O−anionic  1 -P−phosphinito unit, R 2 P−O−H•••O−PR 2 , bridged by an hydrogen, is accompanied by a rearrangement to afford the trans-configured complex 33 with two O−negatively charged phosphinito units coordinated to one platinum center (Scheme 16).…”

Stabilization of a Snub Bisphenoidal Environment of Strontium in Bis[3‐(1‐naphthyl)‐5‐(2‐pyridyl)‐2H‐pyrazole]strontium Bis[3‐(1‐naphthyl)‐5‐(2‐pyridyl)pyrazolate] by Strong Hydrogen Bridges

“…This chemical shift is comparable to values of other six‐membered metallacycles containing strong hydrogen bridges. Thus a broad variety of such compounds shows strong hydrogen bridges with an enormous low field shift with the central atoms playing a minor role; examples include metal complexes such as [(OC) 4 Re{COMe} 2 H] [δ( 1 H) = 21.79]31,32 and [(NCS)Pd{PR 2 O} 2 H] [δ( 1 H) = 15.3],33 as well as the enol forms of diacylphosphanes and ‐arsanes [δ( 1 H) values approx. 19 ppm] 34–36…”