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Source of materialThe title compound was prepared under hydrothermal conditions. A mixture of 1,3-bis(4-pyridyl)propane (bpp, 4 mmol), NaOH (1 mmol), Co(ClO 4)2 (2 mmol), and water (12 ml) was sealed in a 25 mL Teflon-lined reactor and heated in an autoclave at 160°C for 72 h. Then the autoclave was slowly cooled to room temperature. The title complex, as red block-shaped crystals, was collected by filtration, washed with water, and dried in air. DiscussionThe design and construction of new functional solids based on metal-organic frameworks has been extensively studied [1,2]. This is not only due to their structural diversities but also for their potential or practical application in the area of catalysis, gas storage and nonlinear optics [3,4]. In constructing MOFs, flexible ligands are usually selected because they may act as bridging to extend the architecture to 1D chains, 2D layers and 3D networks [5,6]. 1,3-Bis(4-pyridyl)propane, as a very flexible versatile bifunctional ligand, has been frequently used as a spacer for the construction of the polymeric compounds [7,8]. The longer nitrogen-to-nitrogen span in bpp can lead to larger cavities in coordination networks, and different conformations of bpp can result in different extended structures. Up to now, many M(II)-bpp coordination polymers have been synthesized and reported [9,10]. In the title crystal structure, the asymmetric unit consists of one cobalt center bridged by one bpp ligand, one coordinated water molecule, one non-bonded perchlorate ion, one and a half free bpp molecules and one water molecule of crystallization (figure, top). The cobalt ion adopts a distorted octahedron, in which four nitrogen atoms from four bridging bpp ligands occupy the equatorial plane, and two coordinated water molecules occupy the axial positions. The Co1N1 and Co1N2 bond distances are 2.157(2) Å and 2.231(2) Å, respectively. The axial CoO distances have a value of 2.107(2) Å. The CoO and CoN dis-Z. Kristallogr.

Source of materialTo a solution of 4,5-bis(2-hydroxyethylsulfanyl)-1,3-dithiole-2-thione [1] (2.86 g, 10 mmol) and CBr 4(8.3 g, 25 mmol) in dichloromethane (100 ml) was drop-added a solution of PPh 3 (6.56 g, 25 mmol) in the same solvent (20 ml) within 2 hours. The mixture was stirred at room temperature for 7 hours. The resulting solution was washed with water and dried over Na 2SO4. The solvent was then evaporated under reduced pressure and the crude product was purified by column chromatography (dichloromethane : petroleum ether = 2 : 3) to afford the title compound as yellow solid. DiscussionDuring the past decades, tetrathiafulvalene (TTF) and its derivatives (TTFs) as building blocks in both conducting molecular materials and supramolecular chemistry [2-4] have been attracted increasing attention since the discovery of the first metallic charge transfer (CT) complex between TTF and 7,7,8, [5]. On account of the hybrid organic-inorganic materials, CT salts based on TTFs have been widely investigated in the search for new and improved superconducting CT complexes and radical cation salts [6,7].TTFs serve as important p-electron donors for the development of molecular-based organic metals and superconductors, and a variety of studies on modification of the TTF skeleton have been made [8][9][10]. There are many routes for the preparation of TTFs. Generally, the most widely used is the coupling of two identical or non-identical 1,3-dithiole-2-(thi)ones mediated by a trivalent phosphorus derivative [11]. As important precursors of TTF derivatives, 1,3-dithiole-2-thiones have also attracted attention [12]. In the molecule of the title compound, the bond lengths and angles are within normal ranges [13]. In the crystal structure, adjacent molecules are linked by weak intermolecular C−H···S interactions (C···S distances: 3.7676(4) and 3.7932(4) Å, respectively) [14] into a chain, which extends into a two dimensional supramolecular architecture via weak inter-chain interactions of Br···Br (Br···Br distances: 3.731(1) and 3.889(1) Å, respectively) [13]. The adjacent layers are further interconnected into a interleaved three-dimensional supramolecular architecture by weak interactions of S···S and Br···S, with S···S distance range from 3.527(2) to 3.796(2) Å and a Br···S distance of 3.700(2) Å [13]. In addition, dipole-dipole and van der Waals interactions are also effective in the molecular packing.

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