In the title compound, [Ba{HOOC(C(6)H(4))(2)CO(2)}(2)(H(2)O)(2)] or [Ba(C(14)H(9)O(4))(2)(H(2)O)(2)], the Ba atoms are coordinated by nine O atoms, six from two 2'-carboxybiphenyl-2-carboxylate (Hbpdc(-)) ligands and three from three coordinated water molecules, resulting in the formation of face-sharing distorted monocapped square antiprisms. The Hbpdc(-) ligands bridge the Ba atoms to form a one-dimensional helical polymer, with a Ba...Ba distance across the chain of 4.1386 (17) A. Adjacent chains are parallel to each other. The two independent ligands are tetradentate and have the same coordination mode, exhibiting mu-oxo bridges and eta(8)-chelation. The crystal structure is further stabilized by hydrogen bonds within each chain.
The large-scale production of PH 3 , a valuable feedstock material for the synthesis of many organophosphorus derivatives, is hampered by difficult operational conditions. This makes conversion routes, possibly catalytic, of elemental phosphorus to phosphine highly desirable.The monometal [CpRu(PPh 3 ) 2 ( 1 -P 4 )]PF 6 (1) and the dimetal [ CpRu(PPh 3 ) 2 2 (µ, 1:1 -P 4 )](PF 6 ) 2 (2) P 4 derivatives, respectively containing a monodentate and bridging P 4 molecule, surprisingly undergo hydrolysis in very mild conditions yielding the PH 3 complex [CpRu(PPh 3 ) 2 (PH 3 )]PF 6 (3) in stoichiometric amount. Remarkably, this behaviour had not been observed for the Cp* analog of 1 [1]. The structures of 1-3 have been determined; this should help to rationalise the observed reactivity of 1 and 2, which appears to disclose new paths of phosphorus chemistry.[1] de los Rios I., Hamon J.-R., Hamon P., Lapinte C., Toupet L., Romerosa A., Peruzzini M., Angew. A multidentate ligand such as 2,2'-diphenyldicarboxylic acid (H 2 dpdc) is a good candidate for the construction of coordination polymers. In the crystal structures of transition metal complexes with H 2 dpdc, the ligand exhibits several kinds of coordination modes [1][2][3]. Owing to the higher coordination number, the reactions of H 2 dpdc with alkaline-earth metals may generate polymers with different coordination modes. To the best of our knowledge, alkaline-earth 2,2'-diphenyldicarboxylate complexes have never been reported.A new barium(II) complex [Ba(Hdpdc -) 2 (H 2 O) 2 ] has been synthesized. It crystallizes in the monoclinic space group P2 1 /n. The barium atoms are nine coordinated and the coordination geometry around them can be best described as a distorted capped square antiprism. The geometry of the two monoanions is similar to those found in the pure acid [4].The three-dimensional structure is polymeric and consists of infinite chains of face-sharing Ba polyhedra, running parallel to the [010]axis. The Ba..Ba distances across these chains are 4.139(2) Å.[1] Rueff J. M., Pillet S., Claiser N., Bonaventure G., Souhassou M., Rabu P., Eur. J. Inorg. Chem., 2002, 895 Metal nanoparticles have aroused considerable attention in the past few years. Most of the preparations are based on the reduction of metal salt with organic stabilizers or metal vapour deposition from the corresponding metal. Both of the above methods result in particles with a range of sizes. We are interested in preparing metal particles with exact size and shape. We recently established a reliable route to Os-Pd mixed-metal nanoclusters with 21 metal atoms and precise geometry [1]. We also try to prepare larger metal nanoparticles coated on carbon nanotubes using this nanocluster as starting material. The resultant nanoparticles were found to have uniform size and same metal ratio as the nanocluster. 18 ] 3 in 20% yield, together with a known osmium-rhodium cluster, [Os 6 Rh(µ-H) 7 (µ-CO)(CO) 18 ] as the major compound. The molecular structures of the three clusters have been established...
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