Porous Cu/C composites and CuO nanostructures can be easily synthesized from coordination precursors between Cu(2+) and glycine, which are obtained simply by adding ethanol as a poor solvent into a Cu(2+) and glycine solution, and verified to be potential antibacterial agents and photocatalysts.

Source of materialNi(BF4)2 · 4H 2 O and 2-aminopyrimidine in a molar ratio of 1:2 were dissolved in methanol, and the resulting solution was kept standing in air for two days. The precipitated crystals were filtered, washed three times with methanol and dried in air (yield 63 %). Interestingly, during the crystallization, the presence of 5-bromosalicylaldehyde increases the yield of the product. DiscussionUrease, the first enzyme crystallized with nickel ions, is an important enzyme in both agriculture and medicine, which rapidly catalyzes the hydrolysis of urea to form ammonia and carbamic acid. In recent years, some simple mono-and dinuclear nickel(II) complexes with organic ligands-containing nitrogen donors were prepared and structurally determined to mimic the structure and property in the activity center of urease [1][2][3][4]. We hoped to obtain a nickel(II) complex with the new ligand 5-bromosalicylaldehyde; but isolated the title complex unexpectedly.The title complex is a dinuclear nickel(II) complex. In each of the dimer unit, there were one coordination dication and two uncoordinated tetrafluoroborate anions. In the cation, each of the Ni(II) atom is four-coordinated by two nitrogen atoms from two 2-aminopyrimidine ligands and two oxygen atoms from two deprotonated methanolate anions, forming a slightly distorted square environment. The central nickel(II) atom is precisely located inside the square plane with no deviation. The Ni 2O2 plane has an angle of 66.9(1)°with the neighboring pyrimidine ring, and the diagonal angle between the two adjacent aromatic rings is 78.1(1)°, which is closely perpendicular to each other. All 2-aminopydimidine molecules are monodentate ligands, and all of the depronated methanol molecules act as a bidentate ligand, two of which bridged two nickel(II) atoms at the distance of 2.964(6) Å. The amine groups and the imine nitrogen atoms in pyrimidine rings and two of the fluorine atoms in each tetrafluoroborate anion contribute to the formation of hydrogen bonds. A large network of hydrogen contacts connects the dimers into a 3D structure.

Source of materialThe title compound was prepared similarly to the procedure already reported [1]. MnCl 2 · 6H 2 O and two equimolar amount 1,3-diaminopropane were dissolved in water and stirred for 1 h, during which the solution slowly changed from pale pink to dark violet. The mixed solution was stood in air for two weeks and filtered. The crystals obtained were washed with water, ethanol and diethyl ether, successively, and dried in air overnight (yield 48 %). DiscussionMetal complexes with various organic ligands-containing nitrogen atoms have been a hot topics in the field of coordination chemistry [2][3][4][5]. Manganese element exists in some native enzymes and is required by creatures. Due to their biological relevant important behaviors, many manganese complexes with polyamine ligands have been reported in recent years [6][7][8].The title crystal structure consists of one mononuclear complex cation, one chloride anion and one lattice water molecule. In the cation, the central manganese(III) atom is six-coordinated by four nitrogen atoms from two 1,3-diaminopropane molecules and by two nitrogen atoms from a carbonate anion. Both the amine and the carbonate group are bidentate ligands. The manganese atom is in a distorted octahedral environment, and the MnO and MnN bond lengths are in normal range. All the oxygen atoms both of the water and the carbonate anions, and all the nitrogen atoms participate to form hydrogen bonds, which join the constituents into a three-dimensional structure.

Source of materialCobalt(II) perchlorate and 2-aminopyrimidine in a molar ratio of 1:2 were dissolved in methanol, and the resulting solution was kept standing still in air overnight. The crystals precipitated were filtered and washed with methanol for three times, and were dried in vacuo using CaCl 2 (yield 56 %). The presence of salicylaldehyde would increase the yield of the product (from 56 % to 80-95 %). DiscussionCo(II,III) complexes with organic ligands-containing nitrogen donor atoms have been a hot topics in the field of coordination chemistry for many years. Recently, there were many cobalt(II, III) complexes being structurally determined by single X-ray analysis [1][2][3][4]. We have been interested in preparing some mono-, di-or trinuclear metal complexes and assaying their biological relevant activities and succeeded in preparing the trinuclear cobalt complexes [5]. But using the same method we failed to isolate the similar trinuclear cobalt complexes when the 2-aminopyridine was replaced by 2-aminopyrimidine and obtained the title compound. The title complex is a dinuclear cobalt(II) complex, and the crystal structure consists of the coordination dication and two uncoordinated perchlorate anions. In the cation, each of the cobalt(II) atoms is four-coordinated by two nitrogen atoms from two monodentate 2-aminopyrimidine molecules and by two oxygen atoms from two deprotonated methanol molecules. The latter acted as a bidentate ligand, two of which bridged the two cobalt subunits to form one dication. The separation of the two metals in each dimer is 2.951(6) Å. The mean deviation of the plane constituted from the four coordination atoms around each metal was 0.115(5) Å, and the metal was in the plane. The dihedral angles between the metal plane and the two adjacent pyrimidine rings were both 112.8(2)°, and the two neighboring aromatic rings were almost perpendicular each other. Two oxygen atoms in each perchlorate group and all the amine groups and the uncoordinated nitrogen atoms in the pyrimidine molecules contributed to the formation of hydrogen bonds, which link the complexes to form a threedimensional network structure.