Source of materialThetitle compound was prepared under hydrothermal conditions. Am ixture of 5-methoxyisophthalate (0.1 mmol), Cd(ClO 4 ) 2 (0.1 mmol), NaOH (0.1mmol) and H 2 O(15 mL) was placed in a Teflon-lined stainless-steel vessel, heated to 170°C for 4days, and then cooled to room temperature for 24 h. Colorless blockshaped crystals of the title complex were obtained. DiscussionThe design and preparation of metal-organic frameworks (MOFs) has become an attractive research field. The motivation comes notonly from their application as functional materials but is also due to the intriguing structural architectures [1][2][3][4].Inprinciple, the mosteffective approach for the construction of MOFs is to rationally modify the building blocks and to control the assembled motifs for required products via selecting different organic ligands [5,6]. 5-methoxyisophthalate (CH 3 O-H 2 ip) may serve as as uitable building block to construct novel coordination polymers due to the existence of anoncoordinating CH 3 Ogroup on the aromatic backbone, which will have aprofound impact on the electron density of such aligand and therefore different physical and chemical properties [7][8][9]. The asymmetric unit of the title crystal structure consists of aCd 2+ ion, aCH 3 O-ip ligand, three coordinated water molecules and two free waterm olecules.T he Cd 2+ ion is chelated by four oxygen atomsfrom carboxylate of CH 3 O-ip ligand forming two chelating rings, and the oxygen atomsfrom three coordinated water moleculesc ompletet he seven-fold coordination at the metal center. Thus,the coordination geometry aboutCd 2+ ion can be described as adistorted pentagonal bipyramid. Four chelating carboxylate oxygens and an oxygen from water complete the equatorial plane, while the other two oxygens from water form the pyramidal apices with bond angles ÐO7-Cd1-O8 =170.7(1)°. TheCd-O bond lengths are in the range of 2.275(3) -2.397(3) Å. The CH 3 Oip ligand takes the bidentate-chelating coordination mode to bridge the neighbouring Cd 2+ ions and yield achain. These chains are assembled by hydrogen bonds between coordinated water molecules and free water molecules to afford athree-dimensional supramolecularstructure. Thebondlengths andanglesofthese hydrogen bondingp arameters arei nt he range of 1.95(2) -3.03(1) Åand 120.3 -179.3°, respectively. It is obvious that the water and ethanol molecules make acrucial contribution to the stability of the host.

CeKMo 2 O 8 ,tetragonal, I4

Source of materialThe reaction of 2,2'-[butylene-1,4-dithio]bis(5-methyl-1,3,4-thiadiazole) (0.1 mmol) with Cu(Pic) 2 × 4H 2 O( 0.1 mmol) in MeOH (10 mL)for afew minutes afforded alight blue solid. It was filtered, washed with acetone, and dried in air. Thes ingle crystals suitable for X-ray analysis were obtained by slow diffusion of Et 2 Ointo the acetonitrile solution of the solid. DiscussionMetal-organic frameworks (MOFs) are continuously studied because of their intriguing structural architectures and topologies, as well as their potential applications as functional materials in the fields of nonlinear optics, magnetism,molecular separation, catalysis, luminescence, and gas sorption [1,2]. In principle, the most effective approach for the construction of MOFs is to rationally modify the building blocks and to control the assembled motifs for required products via selecting appropriate organic ligands [3][4][5].Theflexiblebisthiadiazolealkanes, as 2,2'-[butylene-1,4-dithio]-bis(5-methyl-1,3,4-thiadiazole), bearing alkyl spacer (-CH 2 -) 4 , are good candidates for N-donor linkers [6,7].The flexible nature of the (-CH 2 -) 4 spacer allows the molecules to bend and rotate freely when binding to metal centers and adjust to the coordinative ability of metal ions. The asymmetric unit of the title crystal structure consists of ahalf Cu 2+ ion, ah alf 2,2'-[butylene-1,4-dithio]bis(5-methyl-1,3,4-thiadiazole) ligand, and one 2,4,6-trinitrophenolate (picrate) ligand. Each Cu 2+ ion is six-coordinated with a{ CuN 2 O 4 }d istorted octahedral environment. Four oxygen atomsf rom two picrate ligands occupy the equatorial plane (d(Cu1-O1) = 1.931(2) Åa nd d(Cu1-O7) =2 .5789(7) Å). Nitrogen atoms from two thiadiazole ligands occupy the apical sites (d(Cu1-N4) =1 .995(2) Å). All Cu-O and Cu-N bond distances are within the range expected for such bonds [6,7]. Obviously, only the Natoms of the thiadiazole ligands coordinate to Cu 2+ ion. The thiadiazole ligands adopt a N,N-bidentate bridging mode in trans configuration for bridging the Cu 2+ ions via translationsymmetry into one-dimensional chains, with the bridged distance d(Cu-Cu)=1 2.176(3) Å. These chains aref urther interconnected with neighbouring molecules by weak intermolecular N-O×××p interactions and C-H×××Oh ydrogen bonds to generate athree-dimensional network. The centroid separation of thiadiazole rings is 9.401(3) Å. Thep icrate ligand adopts bidentate-chelating coordination mode and serves to complete the coordination sphere of the Cu 2+ ion.