ABSTRACT: The Co atom in the title compound, [Co(C(14)H(12)N(6))(H(2)O)(3)]C(4)H(2)O(4), has a mer-CoN(3)O(3) octa-hedral coordination arising from the tridentate N(2),N(4)-di-2-pyridylpyrimidine-2,4-diamine (tpda) ligand and three coordinated water mol-ecules. The asymmetric unit contains two fumarate half-anions, both completed by inversion symmetry. A network of N-H?O and O-H?O hydrogen bonds leads to a three-dimensional network in the crystal structure.
Project description:The Co(II) atom in the title compound, [Co(C(8)H(5)NO(4))(C(12)H(8)N(2))(H(2)O)(3)]·3H(2)O, is six-coordinated in a CoN(3)O(3) octa-hedral geometry; the water-coordinated Co(II) atom is chelated by the N-heterocycle. An inter-molecular N-H?O hydrogen bond occurs. The carboxyl-ate entity coordinates through the amino group. The carboxyl-ate donor unit, coordinated and uncoordinated water mol-ecules inter-act through O-H?O and N-H?O hydrogen bonds, generating a tightly-held three-dimensional cage-like network.
Project description:In the title compound, [Co(C(8)H(4)O(7)S)(C(12)H(8)N(2))(H(2)O)(3)]·H(2)O, the Co(II) cation is coordinated by one sulfoisophthalate dianion, one bidentate phenathroline (phen) mol-ecule and three water mol-ecules in a distorted cis-CoN(2)O(4) octa-hedral geometry. In the crystal structure, aromatic ?-? stacking occurs [centroid-centroid distances 3.7630?(14) and 3.7269?(15)?Å], as well as an extensive O-H?O and C-H?O hydrogen-bonding network.
Project description:In the title compound, [CoCl(CH5N)(C3H10N2)2]Cl2·H2O, the Co(III) ion has an octa-hedral coordination environment and is surrounded by four N atoms of two propane-1,3-diamine ligands in the equatorial plane, with another N atom of the methylamine ligand and a Cl atom occupying the axial positions. The crystal packing is stabilized by inter-molecular N-H?O, N-H?Cl, and O-H?Cl inter-actions, generating a three-dimensional network.
Project description:The title compound, [Co(C(2)H(8)N(2))(3)][CoMo(CN)(8)(C(2)H(8)N(2))(2)(H(2)O)]·2H(2)O, is isostructural with the Ni(II) analogue. The Mo(IV) atom is coordinated by eight cyanide ligands, one of which forms a bridge to a Co(II) atom that is itself coordinated by two bidentate ethane-1,2-diamine (en) ligands and one water mol-ecule. Another Co(II) complex, coordinated to three bidentate en ligands, acts as the counter-ion. The crystal structure contains O-H?N/O, N-H?N/O and C-H?N/O hydrogen bonds, which form a three-dimensional network.
Project description:The title compound, [Co(3)Na(2)(C(7)H(2)ClNO(4))(4)(H(2)O)(12)][Co(C(7)H(2)ClNO(4))(H(2)O)(3)](2)·6H(2)O, consists of a centrosymmetric dimer of [Co(II)(dipicCl)(2)](2-) complex dianions [dipicCl is 4-chloro-pyridine-2,6-dicarboxyl-ate] bridged by an [Na(2)Co(II)(H(2)O)(12)](4+) tetra-cationic cluster, two independent [Co(dipicCl)(H(2)O)(3)] complexes, and six water mol-ecules of crystallization. The metals are all six-coordinate with distorted octahedral geometries. The [Co(II)(dipicCl)(H(2)O)(3)] complexes are neutral, with one tridentate ligand and three water molecules. The [Co(II)(dipicCl)(2)](2-) complexes each have two tridentate ligands. The [Na(2)Co(II)(H(2)O)(12)](4+) cluster has a central Co(II) ion which is coordinated to six water molecules and lies on a crystallographic inversion center. Four of the water molecules bridge to two sodium ions, each of which have three other water molecules coordinated along with an O atom from the [Co(II)(dipicCl)(2)](2-) complex. In the crystal structure, the various units are linked by O-H?O hydrogen bonds, forming a three-dimensional network. Two water molecules are disordered equally over two positions.
Project description:In the mononuclear title compound, [Co(III)(C(15)H(12)N(2)O(3))(C(5)H(5)N)(3)]ClO(4), the Co(III) ion is coordinated by three pyridine mol-ecules and one N'-(3-meth-oxy-2-oxidobenzyl-idene)benzohydrazidate Schiff base ligand in an O,N,O'-tridentate manner. The Co(III) ion adopts a distorted CoN(4)O(2) octa-hedral coordination environment.
Project description:The title co-crystal, C4H7N5·C4H10O2, crystallizes with one mol-ecule of 6-methyl-1,3,5-triazine-2,4-diamine (DMT) and one mol-ecule of butane-1,4-diol in the asymmetric unit. The DMT mol-ecules form ribbons involving centrosymmetric R2(2)(8) dimer motifs between DMT mol-ecules along the c-axis direction. These ribbons are further hydrogen bonded to each other through butane-1,4-diol, forming sheets parallel to (121).
Project description:The title compound, [Co(C(2)H(8)N(2))(3)](CO(3))I·4H(2)O, crystallizes with a [Co(en)(3)](3+) cation (en is ethane-1,2-diamine), CO(3) (2-) and I(-) anions and four water mol-ecules in the asymmetric unit. In the cation, the three rings formed by the ethyl-enediamine units and the Co(III) metal ion are in slightly distorted twist conformations. Numerous O-H?O, N-H?O, N-H?I and O-H?I inter-molecular hydrogen bonds between the cation and two anions in concert with the four water mol-ecules dominate the crystal packing and create a supra-molecular infinite three-dimensional framework.
Project description:In the title compound, C(4)H(6)N(4)·C(3)H(6)O, the pyrimidine-2,4-diamine mol-ecule is nearly planar (r.m.s. deviation = 0.005?Å), with the endocyclic angles covering the range 114.36?(10)-126.31?(10)°. In the crystal, N-H?N and N-H?O hydrogen bonds link the mol-ecules into ribbons along , and weak C-H?? inter-actions consolidate further the crystal packing.
Project description:A modular synthesis of Ru(II)-NHC-diamine complexes from readily available chiral N-heterocyclic carbenes (NHCs) and chiral diamines is disclosed for the first time. The well-defined Ru(II)-NHC-diamine complexes show unique structure and coordination chemistry including an unusual tridentate coordination effect of 1,2-diphenylethylenediamine. The isolated air- and moisture-stable Ru(II)-NHC-diamine complexes act as versatile precatalysts for the asymmetric hydrogenation of isocoumarines, benzothiophene 1,1-dioxides, and ketones. Moreover, on the basis of the identification of reaction intermediates by stoichiometric reactions and NMR experiments, together with the DFT calculations, a possible catalytic cycle was proposed.