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 C-13 NMR, and other methods. The inclusion compound with methylene chloride, [NiL]*(CH2Cl2), is stable in air and thermally stable up to similar to 128 degreesC. Its crystal structure is consistent with van der Waals packing of the host [NiL] and guest CH2Cl2 molecules. The host complex has square-planar coordination of the nickel(H) center with four nitrogen atoms of the macrocycle with an average Ni-N distance of 1.86 Angstrom. 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(CS2) 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 degreesC the C-60 molecule is disordered over two orientations centered at the same site, C-13 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.