Preparation and Thermal Analysis of C14H10N4O6 and its Complexes with Rare Earth

The crystal structure of hexaaqua-bis(μ2-3-(3-(pyridin-4-yl)-1,2,4-oxadiazol-5-yl)propanoato-κ2 O:O′)-tetrakis(3-(3-(pyridin-4-yl)-1,2,4-oxadiazol-5-yl)propanoato-κO)dierbium(III) octahydrate, C60H76N18O32Er2

C60H76N18O32Er2, monoclinic, P21/n (no. 14), a = 10.5441(4) Å, b = 31.1092(9) Å, c = 12.0993(4) Å, β = 114.398(4)°, V = 3614.4(2) Å3, Z = 2, R gt(F) = 0.0431, wR ref(F 2) = 0.0805, T = 296(2) K.

Towards a global greener process: from solvent-less synthesis of molybdenum(vi) ONO Schiff base complexes to catalyzed olefin epoxidation under organic-solvent-free conditions

Schiff base ligands and corresponding molybdenum(vi) complexes, prepared using classical and/or mechanochemical methods, were active as epoxidation pre(catalysts).

Crystal structure of hexaaqua-bis(3-(3-pyridin-4-yl-[1,2,4]oxadiazol-5-yl) propionato-κ3O,O′:O′)-bis(3-(3-pyridin-4-yl-[1,2,4]oxadiazol-5-yl)propionato-κO)-bis(3-(3-pyridin-4-yl-[1,2,4]oxadiazol-5-yl)propionato-κ2O,O′)dineodymium(III) octahydrate, C60H76N18O32Nd2

C60H76N18O32Nd2, monoclinic, P21/c (no. 14), a = 10.609(5) Å, b = 31.215(5) Å, c = 12.407(4) Å, β = 116.54(3)°, V = 3676(2) Å3, Z = 2, R gt(F) = 0.0450, wR ref(F 2) = 0.0910, T = 293(2) K.

The crystal structure of hexaqua(μ2-3-(3-(pyridin-4-yl)-1,2,4-oxadiazol-5-yl)propanoato-1κ2 O,O′;2κO′)(3-(3-(pyridin-4-yl)-1,2,4-oxadiazol-5-yl)propanoato-κO)(3-(3-(pyridin-4-yl)-1,2,4-oxadiazol-5-yl)propanoato-κ2 O,O′)digadolinium(III) octahydrate, C60H76Gd2N18O32

C60H76N18O32Gd2, monoclinic, P21/c (no. 14), a = 10.560(5) Å, b = 31.243(5) Å, c = 12.383(4) Å, β = 116.51(3)°, V = 3656(2) Å3, Z = 2, R gt (F) = 0.0470, wR ref (F 2 ) = 0.1013, T = 293(2) K.

Supramolecular interactions in a copper(II) 4'-(4-bromophenyl)-2,2':6',2''-terpyridine complex

The title compound, [4'-(4-bromophenyl)-2,2':6',2''-terpyridine]chlorido(trifluoromethanesulfonato)copper(II), [Cu(CF(3)O(3)S)Cl(C(21)H(14)BrN(3))], is a new copper complex containing a polypyridyl-based ligand. The Cu(II) centre is five-coordinated in a square-pyramidal manner by one substituted 2,2':6',2''-terpyridine ligand, one chloride ligand and a coordinated trifluoromethanesulfonate anion. The Cu-N bond lengths differ by 0.1 Å for the peripheral and central pyridine rings [2.032 (2) (mean) and 1.9345 (15) Å, respectively]. The presence of the trifluoromethanesulfonate anion coordinated to the metal centre allows Br···F halogen-halogen interactions, giving rise to the formation of a dimer about an inversion centre. This work also demonstrates that the rigidity of the ligand allows the formation of other types of nonclassical interactions (C-H···Cl and C-H···O), yielding a three-dimensional network.

Bis{2-[2-(isopropyl-ammonio)ethyl-imino-meth-yl]-5-methoxy-phenolato}copper(II) bis-(perchlorate)

In the title compound, [Cu(C₁₃H₂₀N₂O₂)₂](ClO₄)₂, the Cu^II atom in the complex dication is chelated by two phenolate O atoms and two imine N atoms from two zwitterionic 2-[2-(isopropyl­ammonio)ethyl­imino­meth­yl]-5-methoxy­phenolate ligands, forming a distorted square-planar geometry. One of the perchlorate anions is disordered over two sites with occupancies of 0.611 (15) and 0.389 (15). Intra­molecular N—H⋯O hydrogen bonds are observed in the complex dication. In the crystal structure, the perchlorate anions are linked to complex dications by inter­molecular N—H⋯O hydrogen bonds.

{6-[(2-Anilinoeth-yl)imino-meth-yl]-2-eth-oxyphenolato}(thio-cyanato-κN)-copper(II)

In the title complex, [Cu(C₁₇H₁₉N₂O₂)(NCS)], the Cu^II atom is chelated by the phenolate O atom, the imine N atom and the amine N atom of the N,N′,O-tridentate 2-eth­oxy-6-[(2-anilino­ethyl)­iminometh­yl]phenolate ligand, and by the N atom of a thio­cyanate anion, forming a distorted CuON₃ square-planar geometry. The dihedral angle between the aromatic rings of the ligand is 67.9 (4)°. In the crystal, inversion dimers linked by pairs of N—H⋯O hydrogen bonds occur, generating R₂²(8) loops.