A ring-opening/alkyne–carbonyl metathesis sequence of alkyne-tethered cyclobutanones catalyzed by AgSbF6 is realized for the first time to furnish multisubstituted naphthyl ketones under mild conditions. A range of substrates decorated with various substituents at different positions were all well accommodated. Preliminary mechanistic studies show that silver salt acted as a Lewis acid to facilitate both C–C cleavage of the cyclobutanone moiety and the subsequent metathesis between CO and CC bonds.

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Four heteropoly blue complexes constructed from Keggin-type heteropoly blue molybdenum-tungsten clusters and Cu(II) ions as linkers, H2[α-SiW10Mo(V)2O40][Cu(PDA)2·H2O]2 (1), H2[α-SiW10Mo(V)2O40][Cu(DEF)3·H2O][Cu(DEF)2·2H2O]·6H2O (2), H2[α-SiW10Mo(V)2O40][Cu(DMF)3H2O]2·6H2O (3), and H4[α-SiW10Mo(V)2O40]2[CuK2(DMF)6][Na0.75K3.25(DMF)6] (4) [PDA = propanediamide, DEF = N,N-diethylformamide and DMF = N,N-dimethylformamide], have been synthesized by conventional reactions and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy, thermogravimetry, X-ray powder diffraction (XRD) and UV spectra. The amount of Cu(II) and the nature of the ligand (DMF, DEF and PDA) can control both the linkage pattern of Cu(II) ions and the dimensionality of the frameworks; this demonstrates for the first time the possibility to assemble heteropoly blue architectures in different dimensionality ranging from zero-dimensional (0D) to one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D). The magnetic investigation showed that the positive magnetic moment could be observed at room temperature, which should be unusual results in magnetochemistry of the two-electron reduced heteropoly blue. The stability and formation conditions of the four compounds are also discussed.

A “directed precursor self-assembly” strategy for the facile synthesis of heteropoly blues (HPBs) has been developed, and the formation mechanism is also discussed.

A Novel Sandwich-Type Europium-Substituted Germanomolybdate Linked with Coordination Cation [Cu(en)2] 2+ . -The structure of title compound (V) is determined by single crystal XRD (triclinic, space group P1, Z = 1). The structure contains sandwich-type [Eu(GeMo11O39)2] 13polyanions which are linked by [Cu(en)2] 2+ cations to form zigzag chains. (V) displays red fluorescence under excitation at 495 nm. The magnetic behavior is affected by the combined effect of depopulation and intermolecular antiferromagnetism. -(YANG, L.-J.; XU*, L.; LI, F.-Y.; WANG, Y.-C.; XU, B.-B.; Inorg. Chem. Commun. 15 (2012) 292-296, http://dx.