Alkaline earth metal complexes phosphine oxides

H nmr studies in non-polar solvents have shown that whereas the sulphide and selenide of the heterocyclic system (224) involve intramolecular coordinative interactions between tin and sulphur or selenium, the related phosphine oxide prefers to bind intermolecularly. In the solid state, a similar situation applies.Structural studies of adducts of triphenylphosphine oxide with monoorganotrichlorostannanes have also been reported. Various types of phosphine oxides are able to complex alkali and alkaline earth metal cations, and to facilitate their transfer across aqueous/organic interfaces.Organogallium complexes of phosphine oxide ligands have been isolated from the reactions of organogallium peroxo derivatives with phosphines. ... 

The coordination properties of phosphine oxides has been explored with late transition-metal (Ru, Co, Rh, Ir, Pd, Pt, Cu, and Au),301 303 305 306 310 316 early transition-metal,317 lanthanide,304,318,319 and actinide307,320 ions. One interesting complex is the palladium(II) complex (148) (Scheme 10) which is an extremely rare example of a ds metal center with a tetrahedral geometry.313 Phosphine oxides have found uses in the extraction of alkali, alkaline earth, and actinide metals in catalysis (hydroformylation of alkenes and epoxides, carbonylation of methanol324) and as a useful crystallization aid (Ph3PO).325... 

Numerous other metal complexes were studied by DTA/DSC and other TA techniques including Ni(II), Cu(II) and Co(II), and Co(II) diethyldithio-carbamate complexes (72) bis(2,4-pentanedionato)beryllium (II) and tris-(2,4-pentanedionato)aluminum (III) complexes (101) dihalogendi(tertiary-phosphine) cobalt (II) complexes (102) bis(trispyrrolidinophosphine oxide)-tetranitratouranium(IV) (103) Co(II), Cu(II), and Cd(II) xanthine complexes (104) and alkali and alkaline earth monomethyl violurates (105,108). 

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