Design and Structural Analysis of Metallamacrocycles Based on a Combination of Ethylene Glycol Bearing Pyridine Units with Zinc, Cobalt and Mercury

Abstract

Keywords: Glycol / Pyridine / Zinc / Cobalt / Mercury / MetallamacrocycleIn the presence of MX 2 salts, ligand 1 (in a M/L ratio of 2:2, M = Zn, Hg, Co, X = Cl or I), based on the ethylene glycol fragment bearing two pyridine units as monodentate coordination sites, leads to isostructural square-shaped neutral metallamacrocycles as demonstrated by X-ray diffraction on single crystals. For all dinuclear complexes generated, the dicationic metal centre adopts a distorted tetrahedral coordination geometry and its coordination sphere is composed of the X 2 N 2 set of coordinating atoms. For all complexes, the [a] 453 parallel packing of the cyclic structures generates channels which are occupied by solvent molecules. The solvent molecules, which behave as substrates, are positioned within the cavity of the metallamacrocycles. Control of the dimension of the macrocycles, by varying the size of the connecting metal centre, has also been demonstrated.

catena-Poly[[dichloridocobalt(II)]-μ-1,3-di-4-pyridylpropane-κ2N:N′]

“…7°. The Co-N bond distance is 2.034 (2) Å, and the Co-Cl distances are 2.240 (1) and 2.254 (1) Å, similar to those found in other related structures (Grosshans, et al, 2004). The bpp ligand is in a TT conformation, with a dihedral angle between two pyridine rings of 64.9°, and a C5-C6-C7-C6 i (i = -x, 1.5y, z) torsion angle of 176.0°.…”

“…For related literature, see: Batten et al (1999); Chen et al (2004); Grosshans et al (2004); Lee et al (2004); Maji et al (2005); Niu et al (2003); Paz & Klinowski (2004); Carlucci et al (1997); Pan et al (2001). (Pan, et al, 2001;Batten, et al, 1999;Carlucci, et al, 1997;Lee, et al, 2004), and some of these compounds have potential application in nonlinear optical (NLO), magnetic, gas adsorption and microporous materials (Maji, et al, 2005;Niu, et al, 2003;Paz, et al, 2004).…”

Structural, Magnetic, and Spectroscopic Comparative Studies on Four New Derivatives of DIMMAL (2-Di1H-2-imidazolylmethylmalonate): A Novel Generator of Multidimensional Networks

“…The intradimeric copper−copper separation is 4.990(3) Å. This cyclic structure, formed by the bridging of the two metal centers by DIMMAL, may be considered to be a dinuclear metallamacrocycle 10 Perspective view and atomic numbering scheme of the [Cu 2 (DIMMAL) 2 (H 2 O) 2 ] dinuclear entities. …”

1D, 2D and 3D coordination polymers of 1,3-phenylene diisonicotinate with Cu(i)/Cu(ii): Cu2I2 building block, anion influence and guest inclusions

“…Further, M(II) halide (Zn, Hg, Co) complexes of the same ligand were also reported to yield iso-structural metallamacrocycles with inclusion of guest molecules. 9 Furthermore, the role of spacers containing ester groups which anchor bis-pyridyl moieties in tailoring the network geometries and properties was demonstrated by Hosseini's group. 10 A set of esterpyridine ligands containing various spacers (hexaethylene glycol, 1,1′-spirobi(indane), dibromofluorene, isomannide, (R)-6,6′-dibromo-1,1′-binaphthyl) were synthesized and their combination with different metal salts produced a variety of novel networks including double stranded interwound linear networks, 10a double stranded interwoven, 10b triple stranded 10c and quadruple-stranded helices.…”