Synthesis and characterization of nickel(II) complexes of a tetraaza macrocycle containing axial ligands

Self-assembly of a 1D hydrogen-bonded polymer from a hexamethyltetraaza macrocyclic nickel(II) complex and isophthalic acid

The compound [Ni(L)(isoph)₂][Ni(L)]·8H₂O (1; L = C-meso-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane; H₂-isoph = isophthalic acid) has been synthesized and structurally characterized. Complex 1 exhibits a geometrically symmetric core with a {4/6} coordination number set. The coordination environment around the Ni(1) ion is a distorted octahedron, while the geometry around the four-coordinate Ni(2) is depicted as square planar in 1D hydrogen-bonded infinite chain. The compound crystallizes in the triclinic system P-1 with a = 8.602(2), b = 10.684(7), c = 16.550(3) Å, α = 91.04(4), β = 94.09(2), γ = 111.09(4)°, V = 1413.9(10) ų, Z = 1. The cyclic voltammogram of 1 undergoes one-electron wave corresponding to Ni^II/Ni^I process. The electronic spectra, electrochemical and TGA behavior of the complex are significantly affected by the nature of the hexamethyltetraaza macrocycle and the axial isoph²⁻ ligand.

1-(3-Amino-1H-inden-2-yl)ethanone

The title compound, C₁₁H₁₁NO, was synthesized by the reaction of 2-(bromo­meth­yl)benzonitrile and acetyl­acetone in the presence of KOH. In the crystal packing, mol­ecules are linked by inter­molecular N—H⋯O hydrogen bonds into chains running parallel to the b axis. Centrosymmetrically-related chains inter­act further through weak C—H⋯π inter­actions.

catena-Poly[cadmium(II)-μ-benzene-1,2-diamine-κ2N:N′-di-μ-chlorido]

The title compound, [CdCl₂(C₆H₈N₂)]_n, is a coordination polymer prepared by the hydro­thermal reaction of cadmium chloride and o-diamino­benzene. The cadmium cation, located on an inversion center, is octa­hedrally coordinated by four Cl atoms at equatorial sites and two N atoms from two ligands at the axial sites. Cd atoms are bridged by Cl atoms, forming extended chains parallel to [010]. Neighboring chains are connected by N—H⋯Cl hydrogen bonds.

Synthesis characterization of Cr(III), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) complexes of 2,12-dimethyl-3-13-di-n-propyl-l,4,ll,14-tetraazacycloeicosa-1,13,l1,13-tetraene

Metal complexes of a 20-membered tetraazamacrocycle 2,12-dimethyl-3,13-di-n-propyl 1,4,11,14-tetraazacycloeicosa-1,3,11,13-tetraene(L) of the type [MLX2]X(M=Cr(III), Fe(III); X=NO3)[CoLNO3]NO3, [NiL(NO3)2], [CuL]Cl2 and [ZnLCl2]have been prepared by 2+2 cyclocondensation of 2,3-hexanedione with 1,6-diaminohexane in the presence of metal ions as templates. These complexes were characterized by elemental analyses, conductances, IR and electronic spectra and magnetic measurements.