HIGH-RESOLUTION NMR-SPECTRA OF PARAMAGNETIC-COMPLEXES OF CO(II) AND NI(II) SALTS WITH ALKYLPYRAZOLES

NMR technique is presently enjoying a wide application as a powerful t ool for studying the structure and molecular dynamics of metal complex es. Generalized NMR-based approaches have long been employed to analyz e the structure of organic compounds and especially, of natural and sy nthetic polymers and hold a firm place in studies of complexes for as long as 10-15 years (e.g., see reviews [1, 2]). Of special interest is NMR spectroscopy of paramagnetic complexes. We feel it useful and ins tructive to generalize the major NMR-based approaches to coordination chemistry and bring them to the level of ''tactics of experimental inv estigation'', i.e., to the level of versatile ready-for-use recipes in tended to answer a broad spectrum of questions, beginning with ''what to observe with NMR methods and how'' and ending with ''how to classif y and perceive the data gained by NMR spectroscopy'', The material to be generalized was mostly gleaned by our systematic inquiries into par amagnetic complexes of trialkyl derivatives of pyrazoles P (of composi tion MX2P2) with salts of Sd-transition metals (M=Co(II), Ni(II)) [3-7 ] accomplished over the last 18 years and borrowed from the papers by K.I.Zamaraev, J.P.Jesson, W.D.Horrocks, and their co-workers [8-11].