Complexes of nitric oxide have been known for centuries, yet never has interest in transition metal nitrosyls been as keen as at present. In part a natural adjunct to the growth of interest in organometallic chemistry, especially metal carbonyls and complexes of 7 acids, the marked surge of research in this area has been stimulated by several important developments during the past decade.Prior to 1960 the interactions of nitric oxide with transition metal ions were studied principally as a way of synthesizing nitrosyl complexes, and the bonding of NO to transition metal ions was envi-

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the a form is part of a bidentate perchlorate bridge.14 Registry No. ß-[Cu(DMAEP)OH] 2 (CIO 4) 2, 50600-14-1. Supplementary Material Available. A listing of structure factor amplitudes will appear following these pages in the microfilm edition of this volume of the journal. Photocopies of the supplementary material from this paper only or microfiche (105 X 148 mm, 24X reduction, negatives) containing all of the supplementary material for the papers in this issue may be obtained from the Journals Department, American Chemical Society, 1155 16th St., N.W., Washington, D. C. 20036.