J. Gómez-Lara

A Bridged High-Spin Complex Bis-[Ni(II)( rac-5,5,7,12,12,14-hexamethyl- 1,4,8,11-tetraazacyclotetradecane)]-2,5-pyridinedicarboxylate Diperchlorate Monohydrate

A bridged high-spin complex,bis-[Ni(II)(rac-5,5,7,l2,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane)]-2,5-pyridinedicarboxylate diperchlorate monohydrate has been obtained by reaction of [Ni(II)(rac-5,5,7, 12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane)](ClO4)2 and 2,5-pyridinedicarboxylic acid in aqueousalkaline (NH4OH) medium. C39H77Cl2N9Ni2O13, chemical formula weight 1068.42, orthorhombic, P212121, a = 11 .423(3) Å,b = 14.770(6) Å, c = 31.608(7) Å,α = β = γ =90.00°, V = 5333(3) Å3, Z = 4, Dcalc = 1.331 g cm-3, μcalc = 0.869 mm-1, F(000) = 2272, T = 293(2), R = 0.0870 for 2686 observed reflections [I > 2σ(I)]. The complexincludes two folded [Ni(rac- Me6[14]aneN4)]2+ units havingopposite diastereomeric configuration. They are bridged through a dianion of2,5-pyridinedicarboxylic acid, with one Ni-atom coordinated to the O-atom ofthe 2-carboxylic group and the pyridine N-atom (forming a 5-membered chelatering), and with the second Ni-atom coordinated to both O-atoms of the 5-carboxylic group (forming a 4-membered chelate ring). Hydrogen bonding involving macrocyclic NH groups, both 2- and 5-carboxylic groups, perchlorate anions and water molecules gives rise to the formation of an infinite supramolecular network in the title compounds crystals.

Synthesis of Jäger complexes of Fe, Co, Pd and Pt

Abstract The reaction 2,9-diacetyl-1,10-dimethyl-4,7-diazadeca-2,9-diene-1,10-dione with Fe(II), C(II), Pd(II) and Pt(II) and the subsequent condensation of the formed complexes with ethylenediamine to give a macrocyclic complex are reported. The obtained products were characterized by elemental analysis, IR, electronic and NMR spectra. Pt(II) oxidates upon complexation giving a Pt(IV) complex. X-ray powder diffraction patterns indicate that the Pd uncyclic complex is isoestructural with its nickel analog.

Physical Properties, Electrical Conductivity and Crystal Structure of the Dadmtani-TCNQ Complex

Abstract The crystal and molecular structure, electrical conductivity, infrared spectra and magnetic susceptibility of the complex, 6,13-diacetyl-5, 14-dimethyl-1, 4,8,11-tetraazacyclotetradeca-4,6,11,13-tetraenenickel (II)-7,7,8,3-tetracyano-p-quinodimethane (DADMTANi-TCNQ) have been measured. DADMTANi-TCNQ crystallizes in the monoclinic space group P21/n with α=7.111 (7), b=14.191 (3), c=13.062 (4), β=93.21 (2)° z=2. The molecules are arranged in alternated stacks. The electrical conductivity of the complex measured along the shortest axis of the crystal is 10−4 ohm−1 cm−1. This low value, the magnetic susceptibility and IR data are related to the crystal structure.

Complexes of 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane (4,13-diaza-18-crown-6) with 2,5-pyridinedicarboxylic and 2,2′-dithiosalicylic acids

AbstractA 1:2:2 complex of 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane with 2,5-pyridinedicarboxylic acid and water (1) and its 1:1:1.75 complex with 2,2′-dithiosalicylic acid and water (2) have been obtained and characterized by x-ray diffraction. C26H40N4O14 (1), triclinic,

Molecular modeling of octahedral complex cations composed of [Ni(II)(rac-Me6[14]aneN4)]2+ units and bidentate carboxylate ligands

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A 1:2:2 complex between 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane (4,13-diaza-18-crown-6), 2,6-dihydroxyanthraquinone and water

, a = 9.574(1) Å, b = 9.632(1) Å, c = 9.723(1) Å, α = 112.70(1)°, β = 91.07(1)°, γ = 115.45(1)°, V = 728.35(13) Å3, Z = 1. C26H39.5N2O9.75S2 (2), M = 600.22, triclinic,

Crystal structure of M(II) bis-μ-diacetoamidopropionate, diaqua·4H2O (M=Cu, Zn, Co): An uncommon carbonyl-O-of-peptide-coordinated two-dimensional layered polymer

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