In the mol­ecule of the title compound, [FeRu(C3H5)(C5H5)(C10H15)(CO)4]PF6, two metal centers are bridged by an allyl chain, resulting in a chiral heterobimetallic mol­ecular ion, with hexa­fluoro­phosphate as counter‐ion. Both enanti­omers are present in the crystal structure, forming a racemate.

[{CpFe(CO) 2 } 2 l-(NH 2 (CH 2 ) n NH 2 )](BF 4 ) 2 (n = 2-4) (3), respectively. These complexes have been fully characterized and the mass spectral patterns of complexes 2 are reported. The structures of compounds 2a (n = 2) and 2b (n = 3) have been confirmed by single crystal X-ray crystallography. The single crystal X-ray diffraction data show that complex 2a, [CpFe(CO) 2 NH 2 (CH 2 ) 2 CH 3 ]BF 4 , crystallizes in a triclinic P 1 space group while 2b, [CpFe(CO) 2 NH 2 (CH 2 ) 3 CH 3 ]BF 4 , crystallizes in an orthorhombic Pca2 1 space group with two crystallographically independent molecular cations in the asymmetric unit. Furthermore, the reaction of 1 with 1-alkenes gives the g 2 -alkene complexes in high yield.

No abstract

The use of a polysaccharide extract isolated from cactus pads (Opuntia ficus indica) as a low-cost adsorbent for the removal of Pb 21 and Cd 21 from water was investigated. The Brunauer2Emmett2Teller study showed that the surface area of the extract powder was approximately 2.373 m 2 /g. Inductively coupled plasma optical emission spectrometry was used to monitor changes in ion concentrations during the adsorption. The adsorption mechanism was studied as a function of physicochemical variables such as initial metal ion concentration, adsorbent dosage, contact time, and pH of the solution. The results indicated that the adsorption percentage of the two cations increased with contact time, attaining equilibrium at 150 and 120 min for Cd 21 and Pb 21 , respectively. At these optimal times, the adsorption capacity of Pb 21 and Cd 21 increased with increasing pH. Langmuir, Freundlich, Toth, Dubinin-Radushkevich, Sips, and Redlich-Peterson isotherm models were thereafter applied to understand the adsorption mechanism. The qe plot against C e for the Toth isotherm model had the best fit with low error values and the highest correlation coefficient (R 2 ) values of 0.9973 and 0.9953 for Pb 21 and Cd 21 , respectively. Therefore, the isotherm study reveals that the adsorption mechanism involved is complex because of the presence of different interactions (such as ionic exchange and coagulation), yielding maximum adsorption capacities of 256 and 151 gm/L for Pb 21 and Cd 21 , respectively. Generally, the polysaccharide extract exhibited higher adsorption capacity of Pb 21 than of Cd 21 under similar conditions. Besides the removal capacities reported in this study, the adsorbent regeneration and its reusability was also investigated.

In the title mol­ecule, [Fe2(C3H5)(C5H5)(C10H15)(CO)4]PF6, an allyl chain bridges two Fe metal centres, forming a chiral positively charged mol­ecular ion, with hexa­fluoro­phosphate as the counterion. In the crystal structure, both enanti­omers are present.