TACTICITY VERSUS DIMENSION OF THE EXTENDED STRUCTURES IN THE CRYSTALSOF HETEROSPIN MAGNETS MADE OF TRANSITION-METAL COMPLEXES WITH THE POLY(AMINOXYL) RADICAL

Bis- and tris(aminoxyl) radicals and di(4-pyridyl)diazomethane form cr ystalline complexes with extended structures upon reaction with [M(hfa c)(2)] (M = Mn-II or Cu-II and hfac = hexafluoroacetylacetonate). Orga nic 2p and metal 3d spins in these complexes order at 3.4-46 K dependi ng on the dimensions of the extended structures and the magnitude of e xchange coupling between the adjacent spins. In the crystals of one-di mensional systems, the polymeric chains are isotactic in that free rad ical or precursor ligands and/or metal centres have the same chirality along any given chain. The polymeric chains are syndiotactic and cros s link to form two-dimensional honeycomb or three-dimensional crossed parallel networks.