[μ-2,3,5,6-Tetra­kis(2-pyrid­yl)pyrazine-κ6 N 6,N 1,N 2:N 3,N 4,N 5]bis­[diaqua(dihydrogen m-phenylene­diphospho­nato-κO)nickel(II)] dihydrate

The title compound [Ni2(C6H6O6P2)2(C24H16N6)(H2O)4]·2H2O or [Ni2(tpyprz)(1,3-HO3PC6H4PO3H)2(H2O)4]·2H2O [tpyprz = tetra­kis­(2-pyrid­yl)pyrazine, C24H16N6] is a binuclear complex with a crystallographic inversion center located at the center of the pyrazine ring. The equivalent nickel(II) sites exhibit a distorted {NiO3N3} octa­hedral coordination, with the three nitro­gen donors of each terminus of the tpyprz ligand in a meridional orientation. An aqua ligand occupies the position trans to the pyrazine nitro­gen donor, while the second aqua ligand is trans to the oxygen donor of the dihydrogen-1,3-phenyl­diphospho­nate ligand. The Ni—O and Ni—N bond lengths fall in the range 2.011 (3) to 2.089 (3) Å. The protonation sites on the organo­phospho­nate ligand are evident in the significantly longer P—O bonds compared to the unprotonated sites. In the crystal structure, the complex mol­ecules and the solvent water mol­ecules are linked into a three-dimensional hydrogen-bonded framework through O—H⋯O inter­actions between the aqua ligands, the protonated organo­phospho­nate oxygen atoms and the water mol­ecules of crystallization. Intra­molecular π-stacking between the phenyl group of the phospho­nate ligand and a pyridyl group of the tpyprz ligand, at a distance of 3.244 (5) Å between ring centroids, is also observed

(Di-2-pyridyl­amine)­(methanol)sulfato­copper(II)

The title complex, [Cu(SO4)(C10H9N3)(CH3OH)], is a mononuclear species with the CuII ion in a Jahn–Teller-distorted ‘4 + 1’ square-pyramidal geometry. The basal plane is defined by the pyridyl N-atom donors of the bipyridyl­amine (bpa) ligand and two O-atom donors of the sulfate ligand. The coordination geometry is completed by the axial coordination of a methanol O-atom donor. The axial bond length displays the usual elongation: Cu—O(axial) = 2.168 (2), Cu—O(basal) = 2.016 (2) (average) and Cu—N(basal) = 1.951 (3) Å (average). In the crystal structure, the complex mol­ecules are linked through N—H⋯O and O—H⋯O hydrogen bonds into chains along [100]

catena-Poly[[bis­(μ-5-bromo­pyridine-3-carboxyl­ato-κ2 O:O′)dicopper(II)]-bis­(μ-5-bromo­pyridine-3-carboxyl­ato)-κ3 O,O′:N;κ3 N:O,O′]

The title compound [Cu2(C6H3BrNO2)4]n, forms sheets in the bc plane. The structure features the dinuclear paddle-wheel cage motif common to copper(II) carboxyl­ates. The polymeric structure is achieved through bridging between binuclear units by the pyridyl donors of two of the four carboxyl­ates of the cage. Each cage engages in axial bonding at each copper atom to a pyridyl nitro­gen donor and extends two 5-bromo­pyridine-3-carboxyl­ate groups to bridge to adjacent binuclear sites in the bc plane. Each cage is linked to four adjacent cages in the plane. The intra­dimer Cu⋯Cu distance is 2.6465 (5) Å. The remaining 5-bromo­pyridine-3-carboxyl­ate groups project into the inter­lamellar domain and inter­digitate in pairs from each neighboring layer

[μ-N,N,N′,N′-Tetra­kis(2-pyridyl­meth­yl)butane-1,4-diamine]­bis­[diacetato­cadmium(II)] nona­hydrate

The title dinuclear complex, [Cd2(CH3CO2)4(C28H32N6)]·9H2O, is located on a crystallographic inversion center. The unique CdII ion displays a 5 + 2 coordination. A distorted square-pyramidal geometry is formed by the dipicolyl­amine unit of the ligand via the N atoms in a meridional fashion and two O atoms of the acetate ligands with short Cd—O distances. The coordination is completed by two loosely bound O atoms of the acetate ligands. The Cd—N distances involving the pyridine N atoms differ slightly from each other and the Cd—N distance involving the tertiary N atom is the longest. In the crystal structure, complex mol­ecules and solvent water mol­ecules are connected into a three-dimensional network via inter­molecular O—H⋯O hydrogen bonds. One of the water mol­ecules lies on a twofold rotation axis

[μ-N,N,N′,N′-Tetra­kis(2-pyridyl­meth­yl)butane-1,4-diamine]­bis­[dibromidocopper(II)]

The title dinuclear copper complex, [Cu2Br4(C28H32N6)], is located on an inversion center. The unique CuII ion is in a slightly distorted square-pyramidal environment in which the N atoms of a dipicolyl­amine group and a bromide ligand form the basal plane. The apical site is occupied by a second Br atom. While the Cu—N distances involving the pyridine N atoms are the same within experimental error, the Cu—N distance involving the tertiary N atom is slightly elongated. Due to the typical Jahn–Teller distortion of copper(II) complexes, the apical Cu—Br distance is elongated

2-(1,3-Dioxoisoindolin-2-yl)ethyl 4-methyl­benzene­sulfonate

In the title mol­ecule, C17H15NO5S, the dihedral angle between the essentially planar atoms of the tosyl moiety (the S atom and the seven tolyl C atoms) and the phthalimide moiety is 6.089 (3)°. The mol­ecule is folded about the ethyl­ene bridge, adopting a staggered conformation such that the benzene ring of the tosyl group and the five-membered ring of the phthalimide moiety have a face-to-face orientation with a centroid-to-centroid separation of 3.7454 (12) Å. The crystal structure is stabilized by weak inter­molecular π–π inter­actions between symmetry-related five-membered rings of the phthalimide groups, with a centroid-to-centroid distance of 3.3867 (11) Å. The compound is used for the attachment of a suitable chelate functionality for radiolabeling purposes

A binuclear vanadium oxyfluoride: di-μ-oxido-bis­[(2,2′-bipyrid­yl)fluorido­oxidovanadium(V)]

The title compound, [V2F2O4(C10H8N)2], is a centrosymmetric binuclear vanadium(V) species with the metal ions in a distorted octa­hedral environment. The coordination geometries of the symmetry-equivalent VV atoms are defined by cis-terminal fluoride and oxide groups, unsymmetrically bridging oxide groups and the N-atom donors of the bipyridyl ligand. The crystal packing is stabilized by weak inter­molecular C—H⋯O and C—H⋯F hydrogen bonds

A binuclear molybdenum oxyfluoride: μ-oxido-bis­[(2,2′-bipyrid­yl)fluoridodioxidomolybdenum(VI)]

The title compound, [Mo2F2O5(C10H8N2)2], is a centrosymmetric binuclear molybdenum(VI) species with the metal atoms in a distorted octa­hedral environment. The coordination geometries of the symmetry-equivalent molybdenum sites are defined by the cis-terminal oxide groups and the N-atom donors of the bipyridyl ligand in the equatorial plane with axial F and bridging O atoms. The bridging O atom occupies a center of symmetry. The mol­ecules stack in the a-axis direction, and the crystal packing is stabilized by weak intra- and inter­molecular C—H⋯O and C—H⋯F hydrogen bonds

Depression after cyproheptadine: MAO treatment

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/30030/1/0000398.pd