| 11599967 |
Soldatov DV, Diamente PR, Ratcliffe CI, Ripmeester JA: (6,17-Dimethyl-8,15-diphenyldibenzo [b,i][1,4,8,11]-tetra-aza [14] annulenato ) nickel (II) in solids: two guest-free polymorphs and inclusion compounds with methylene chloride and fullerene (C (60))-carbon disulfide. Inorg Chem. 2001 Oct 22;40(22):5660-7.
Two guest-free polymorphs and two inclusion compounds of the macrocyclic title complex [NiL] have been isolated and characterized with single-crystal and/or powder XRD, solid-state (13) C NMR, and other methods. The inclusion compound with methylene chloride, [NiL](CH (2) Cl (2)), is stable in air and thermally stable up to approximately 128 degrees C. Its crystal structure is consistent with van der Waals packing of the host [NiL] and guest CH (2) Cl (2) molecules. The host complex has square-planar coordination of the nickel (II) center with four nitrogen atoms of the macrocycle with an average Ni-N distance of 1.86 A. The molecule has a saddle-shaped conformation with the guest molecule located between one phenylene and two phenyl rings of the host molecule. Isostructural compounds with chloroform and 2-chloropropane form only as mixtures along with a guest-free host polymorph. The inclusion compound with C (60) has a composition 3 [NiL]*(C (60))*2 (CS (2)) and here also the crystal structure is consistent with a van der Waals type of packing. Three crystallographically inequivalent [NiL] molecules have geometries similar to that in the inclusion compound with methylene chloride. The concave surfaces of the complex molecules form a spherical cavity for the C (60) molecule. At -100 degrees C the C (60) molecule is disordered over two orientations centered at the same site. (13) C NMR studies at room temperature show that the C (60) molecule is undergoing rapid pseudo-isotropic rotation. The stability and other properties of the title and related complexes are discussed. |
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