Novel three-dimensional coordination polymer of 2-(1,3,5-tri-aza-7-phospho-niatri-cyclo-[3.3.1.1]decan-7-yl)ethanoic acid with silver(I) tetra-fluoro-borate.

An Ag-based coordination polymer (CP), namely, poly[[[μ-2-(1,3,5-tri-aza-7-phospho-niatri-cyclo-[3.3.1.

Mechanochemical P-derivatization of 1,3,5-Triaza-7-Phosphaadamantane (PTA) and Silver-Based Coordination Polymers Obtained from the Resulting Phosphabetaines.

We have described earlier that in aqueous solutions, the reaction of 1,3,5-triaza-7-phosphaadamantane (PTA) with maleic acid yielded a phosphonium-alkanoate zwitterion. The same reaction with 2-methylmaleic acid (citraconic acid) proceeded much slower. It is reported here, that in the case of glutaconic and itaconic acids (constitutional isomers of citraconic acid), formation of the corresponding phosphabetaines requires significantly shorter reaction times.

Palladium (II)-Salan Complexes as Catalysts for Suzuki-Miyaura C-C Cross-Coupling in Water and Air. Effect of the Various Bridging Units within the Diamine Moieties on the Catalytic Performance.

Water-soluble salan ligands were synthesized by hydrogenation and subsequent sulfonation of salens (,'-(slicylidene)ethylenediamine and analogues) with various bridging units (linkers) connecting the nitrogen atoms. Pd (II) complexes were obtained in reactions of sulfosalans and [PdCl]. Characterization of the ligands and complexes included extensive X-ray diffraction studies, too.

Effect of 2-Propanol on the Transfer Hydrogenation of Aldehydes by Aqueous Sodium Formate using a Rhodium(I)-sulfonated Triphenylphosphine Catalyst.

In water/2-propanol mixtures [RhCl(mtppms)(3)] (mtppms = monosulfonated triphenylphosphine) was an efficient catalyst for the selective C=C reduction of trans-3-phenyl-2-propenal (trans-cinnamaldehyde) by hydrogen transfer from formate at temperatures as low as 30 °C. An outstandingly high catalyst turnover frequency of 1214 h(-1) was determined at 70 °C. A possible mechanism of the reaction is suggested on the basis of kinetic studies and (1)H- and (31)P-NMR spectroscopic identification of the major Rh(I) species in the reaction mixtures as cis-mer-[H(2)RhX(mtppms)(3)] (X = HCOO(-) or H(2)O).

Water-Soluble Iridium-NHC-Phosphine Complexes as Catalysts for Chemical Hydrogen Batteries Based on Formate.

Molecular hydrogen, obtained by water electrolysis or photocatalytic water splitting, can be used to store energy obtained from intermittent sources such as wind and solar power. The storage and safe transportation of H2 , however, is an open and central question in such a hydrogen economy. Easy-to-synthesize, water-soluble iridium-N-heterocyclic carbene-phosphine (Ir(I) -NHC-phosphine) catalysts show unprecedented high catalytic activity in dehydrogenation of aqueous sodium formate.

Classical and non-classical phosphine-Ru(II)-hydrides in aqueous solutions: many, various, and useful.

Hydrogenation of the water-soluble [{RuCl(2)(mtppms)(2)}(2)] (mtppms = monosulfonated triphenylphosphine) was studied in aqueous solutions in the presence of excess mtppms both with H(2) and with aqueous HCOONa. Depending on the reductant, the pH and H(2) pressure altogether nine hydride species were identified. In acidic solutions at 1 bar H(2) pressure the known [RuHCl(mtppms)(3)] (1) and [{RuHCl(mtppms)(2)}(2)] (3) were formed, however, elevated pressure led to the formation of trans-[RuH(2)(mtppms)(4)] (11).

Solution pH: A Selectivity Switch in Aqueous Organometallic Catalysis-Hydrogenation of Unsaturated Aldehydes Catalyzed by Sulfonatophenylphosphane-Ru Complexes.

The equilibribrium distribution of water-soluble ruthenium hydrides [HRuCl(tppms) ] and [H Ru(tppms) ] (tppms = (3-sulfonatophenyl)diphenylphosphane) in the reaction with H is governed by the pH value. As a consequence, the selectivity in the hydrogenation of cinnamaldehyde for reaction at C=C or C=O can be completely inverted by changing the pH value (see drawing below).