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Search query: macrocyclic compound
449 articles match your search "macrocyclic compound"Results 1 to 10, sorted by relevance:
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In the title compound, [24]dithiaamethyrin(1.0.0.1.0.0); C50H44Cl4N4S2, the macrocycle can be described as a highly planar structure with a mean-plane deviation (MPD) value of 0.0416 Å. The molecular conformation is stabilized by two intramolecular N—H
N interactions. In the crystal, molecules are also linked via C—H
π interactions forming a three-dimensional network.
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The metallacrown compound, NiII(OAc)2[12-MCMn(III)N(shi)-4](CH3OH)6·2CH3OH·H2O, where MC is metallacrown, shi3− is salicylhydroximate, and −OAc is acetate, has an overall square shape that captures an NiII ion in a central cavity while the ring of the metallamacrocycle contains four MnIII ions. Two acetate anions, which are located on opposite faces of the MC, form bridges between the central NiII ion and two of the ring MnIII ions.
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The crystal structure of a valinomycin complex with an encapsulated [Mg(H2O)6]2+ ion as an independent structural unit is described. The new cation-binding mode exhibited by valinomycin, a cyclic dodecadepsipeptide, occurs via hydrogen bonds from the coordinated water molecules of the hexahydrate cation, instead of via direct links to the cation. The interaction of the [Mg(H2O)6]2+ ion with the cyclic polypeptide has important implications for the study of metal binding with biological models under physiological (aqueous) conditions.
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Deprotonation of an ionogenic tetradentate bipyridine ligand resulted in the synthesis of a rare octacoordinated anionic mononuclear iron(III) complex. An investigation of the magnetic properties revealed a gradual incomplete spin-crossover behaviour below 150 K.
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The crystal of the first title compound contains five-coordinate [Zn(L)I]+ (L = cyclam) cations and non-coordinated iodide anions; the extended structure is consolidated by N—H
I and N—H
(I,I) hydrogen bonds. The crystals of the second title compound consist of chains of [Zn(L)I]+ units and triiodide counter-ions but without significant hydrogen-bonding interactions.
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The coordination polyhedra of the zinc(II) ions in the complex cation and the anion of the title compound, viz. trans-ZnN4O2, are distorted octahedra. In the crystal, the hydrogen-bonding interactions between the N—H groups of the tetraamine, the acidic groups of the anion and coordinated water molecules result in formation of one-dimensional tapes running along the [1
0] direction, which are further arranged in sheets lying parallel to the (001) plane.
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This compound was prepared by bromination/dehydrobromination of E,E,Z-cyclododecatriene. The crystal is composed of C2-symmetrical molecules with an E conformation of the bromoalkene fragments and nearly linear alkyne units. The torsion angles in the ring suggest significant ring strain.
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The title coordination polymer consists of parallel zigzag-like chains of [Ni(cyclam)]2+ cations bridged by the dianions of the acid in the axial positions of the trans-NiN4O2 coordination polyhedron. Polymeric chains propagating along the [101] direction are assembled into a three-dimensional network by O—H
O hydrogen bonds.
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The behaviour under compression of a series of six isomorphous coordination complexes [MX2(1,4,7-trithiacyclononane)] (M = Pd, Pt; X = Cl, Br, I) is reported. The different structural properties of these complexes are described and analysed, including by the use of density functional theory (DFT) and bond-order calculations.
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Reversible solvent-triggered single-crystal-to-single-crystal transformations are observed between two copper(II) azamacrocyclic complexes and characterized by single-crystal X-ray diffraction and in situ powder X-ray diffraction.