Bis-chromium alkoxycarbene complexes, bridged via the alkoxy groups, underwent photochemical cycloaddition to protected imidazolines to give protected bis-azapenams. Deprotection followed by treatment with acid produced bis-dioxocyclams bridged top and bottom with four-, five-, six-, and twelve-atom alpha,omega-diol linkages. These bis-dioxocyclam ligands formed mono- and bis-nickel(II) complexes. The five-atom bridged system (-O(CH2)(3)O-) was characterized by X-ray crystallography and had a number of unusual features.