Orbitally similar situations occur in a number of other binuclear complexes (e.g., edged-sharing or confacial bioctahedral complexes,^Mb,16,2°¿¡bridged trivalent titanocene complexes311) where relatively large exchange interactions have been attributed to direct exchange between ions separated by ~3 Á or less. Since internuclear M-M separations in 3a-e vary from 2.90 to 3.04 Á, strong direct exchange interactions seem highly probable.
In the past, thin films of ceramic materials including boron nitride have been prepared primarily by vapor deposition techniques.l These films are adequate for some applications; however, they vary a great deal in quality and purity., To achieve several advanced materials goals that Present address: Scientific Rasearch Laboratories, Room E3172, Ford Motor Co., Dearborn, MI 48121-2053.
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