The construction of coordination polymers based on metalbridging ligand building blocks is an area of great activity because of their fascinating structural diversity and potential applications as function materials. 1,2 A study of the literature about transition metal supramolecular architectures shows that the most extensively studied bridging ligand is 4,4′-bipyridine (4,4′-bpy), and a wide range of infinite frameworks including diamondoid, grid, ladder, brick, railroad, and octahedral building blocks have been generated with 4,4′-bpy or its extended analogues. 1 In some cases, the frameworks generate spacious voids, cavities, and channels, which are usually occupied by solvent molecules. In other cases, interpenetrating structures are formed in which the voids associated with one framework are occupied by one or more independent infinite substructures of the same chemical composition and with the same topology. 3 Examples of interpenetrating 3D frameworks

There is considerable interest in [Ru(tpy)(L)Cl] n+ type complexes (where tpy = 2,2′:6′,2″-terpyridine, L = bidentate ligand, n = 0 or 1), because they are used as precursors of aquo complexes, which can finally be converted to oxo compounds. Oxo-ruthenium complexes are useful as catalysts in different reactions, particularly in the catalytic oxidation of water to dioxygen.1,2 As a part of serial studies on the properties of oxoruthenium complexes, we synthesized the title complex, [Ru(tpy)(L)Cl]Cl (where L = 2-(phenylazo)pyridine = azpy).2-(Phenylazo)pyridine (azpy) and [Ru(tpy)Cl3] were prepared by methods reported in the literatures. 3,4 Ru(tpy)Cl3 (0.2 g) and azpy (0.09 g) were refluxed for 3 h in 25 mL of ethanol-water containing LiCl (0.07 g) and triethylamine (0.06 mL). A hot solution was filtered and the filtrate was allowed to stand for 10 days. Crystals suitable for an X-ray technique were selected from the obtained solid. Details concerning the X-ray structure determination are given in Tables 1 -3. Ru(II) is in a distorted octahedral environment bonded to three nitrogen atoms of the tpy ligand, two nitrogen atoms of the azpy ligand and one chlorine atom. The four nitrogen atoms (N3, N4, N5, N6) define the equatorial plane, whereas the Cl1 and N1 atoms occupy the trans-axial sites. The longest bond, Ru-Cl1, is comparable to those in cis-Ru(azpy)2Cl2. 5 It is noted that the N(6)-Ru-N(3) angle is 104.82(16)˚, greater than that (99.4(3)˚) in [Ru(tpy)(azpy)(CH3CN)](ClO4)2.

Two fluorinated metal arsenates, (C(4)H(12)N(2))(1.5)[M(3)F(5)(HAsO(4))(2)(AsO(4))] (M = Fe, Ga), have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, magnetic susceptibility, Mössbauer spectroscopy, and (71)Ga NMR spectroscopy. The two compounds are isostructural and crystallize in the monoclinic space group P2(1)/c (No. 14) with a = 8.394(1) A, b = 21.992(3) A, c = 10.847(1) A, beta = 96.188(2) degrees, and Z = 4 for the Fe compound, and a = 8.398(1) A, b = 21.730(3) A, c = 10.679(1) A, beta = 95.318(2) degrees, and Z = 4 for the Ga compound. The structure consists of infinite chains of corner-sharing MX(6) (X = O, F) octahedra and dimers of edge-sharing MO(3)F(3) octahedra, which are linked into two-dimensional sheets through arsenate tetrahedra with diprotonated piperazinium cations between the sheets. Magnetic susceptibility and Mössbauer spectroscopy confirm the presence of Fe(III). The (71)Ga MAS NMR spectrum clearly shows a line shape consisting of three components, corresponding to three crystallographically distinct Ga sites.