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Dumbbell-like Fe3O4-Au superparamagnetic nanoparticles exhibit enhanced electromagnetic losses at gigahertz ascribed to the epitaxial Fe3O4/Au interfaces that induce anisotropic polarizations. This provides insight into the microscopic dielectric polarization of heterogeneous hybrids of noble metal and magnetic oxide and thus has implication for potential applications, such as the development of high electromagnetic loss materials. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Dumbbell-like Pt(48)Pd(52)-Fe(3)O(4) nanoparticles are synthesized and functionalized with oleylamine-polyethyleneglycol to serve as an efficient catalyst for H(2)O(2) reduction and tetramethylbenzidine (TMB) oxidation in biological solutions. The Pt(48)Pd(52)-Fe(3)O(4)/TMB kit is even more active than the natural enzyme for H(2)O(2) detection with a detection limit reaching 2 μM, and is successfully used to quantitatively monitor the extracellular H(2)O(2) generated by neutrophils.

The dumbbell-like calcium carbonate (CaCO3) crystals were synthesized in the presence of trisodium citrate. Different morphologies were obtained by changing the reaction temperature and the trisodium citrate concentration. The obtained samples were characterized by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the morphology of CaCO3 crystals was markedly affected by the reaction temperature and citrate anion concentration. The possible growth mechanism of CaCO3 crystals was proposed. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

The dimeric [Cu(bipy)(μ2-OH)]4 [(H2O) (bipy)2HPW11Cu2O39] 2·2EtOH·10H2O Keggin polyoxometalate is prepared by solvothermal reaction of Cu(NO3)2, H3PW12O40, and bipy in H2O/EtOH (2:1) solution (pH 4.6 adjusted with H3PO3, autoclave, 150 °C, 3 d; 38% yield).

In geschlossenen Cu-Rohren wurden Einkristalle von Sr9Zn4Cu2O14 dargestellt. Moderne Rontgenmethoden fuhren zu monokliner Symmetrie [Raumgruppe CC2/m; a = 22,22; b = 3,61; c = 11,29 A; β = 98,6°, Z = 2]. Die Kristallstruktur enthalt ein Sr/O-Gerust mit Sr2+ in oktaedrischer und trigonal prismatischer Koordination. SrO6-Oktaeder treten partiell flachenverknupft auf. In das Sr/O-Gerust sind Zn2+-Ionen in Tetraederlucken und Cu+-Ionen mit hantelformiger Koordination eingelagert. A New Strontium-Oxometallate: Sr9Zn4Cu2O14, Containing Sr2+ in Face Connected Octahedra Single crystals of Sr9Zn4Cu2O14 were prepared in closed Cu-tubes. Modern X-ray investigations lead to monoclinic symmetry (space group CC2/m, a = 22.22; b = 3.61; c = 11.29; β = 98.6°; Z = 2). The crystal structure is characterized by a threedimensional Sr/O network, containing Sr2+ in octahedral and trigonal prismatic coordination. The SrO6 octahedra are partly face connected. Incorporated Zn2+ and Cu+ Ions show tetrahedral and dumbbell like coordination.