31P and 13C NMR of Transition Metal Phosphine Complexes by Paul S. Pregosin, Roland W. Kunz PDF

By Paul S. Pregosin, Roland W. Kunz

ISBN-10: 3642488307

ISBN-13: 9783642488306

ISBN-10: 3642488323

ISBN-13: 9783642488320

For virtually 1 / 4 of a century the phrases "nuclear magnetic reso­ nance" have been synonymous with proton I,leasurements. in this interval the literature abounded with a doubtless endless number of 1H NHR experiences involved basically with carbon chemistry. sometimes a "novel" nucleus used to be studied and, even in these early days, the poten- thirteen 14 31 19 tial provided by means of C, N, P and F was once essentially well-known. regardless of the attract, the technical problems serious about measuring a few of these nuclei have been faraway from trivial. Small magnetic moments and coffee common abundance together with spin-spin coupling from different nuclei, usually protons, ended in a signal-to-noise challenge whose severity successfully excluded the examine of steel complexes with unfa­ vorable solubility features. the 1st very important step forward got here with the appearance of extensive band 1H-decoupling. for instance, the featureless huge 31p resonance linked to the generally used ligand triphenyl phosphine is switched over to a pointy, extra easily ob­ served singlet whilst wide-band decoupling is hired (see Fig. 1). regardless of this development research of extra attention-grabbing molecules, akin to catalytically lively complexes was once compelled to watch for the devel­ opment of Fourier rework tools on account that in simple terms with quite quick sign averaging equipment might enough signal-to-noise ratios be achieved.

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Extra resources for 31P and 13C NMR of Transition Metal Phosphine Complexes

Example text

Additionally, there are studies describing the 31p NMR characteristics of the complexes f ac - W(CO)3(PR 3 )3 [77], and [n5CpW(CO)2LX], where L = a phosphine or phosphite ligand and X = Me 3 Sn or Me 3 Pb [108 a,b]. 1J (W,p) in the pentacarbonyl phosphine complexes has a positive sign. Two separate linear relationships have been found in the W(CO)5PR3 complexes connecting the Sanderson Electronegativity of the substituents on phosphorus and 1J (W,p) [43]. The values of 1J (W,p) in this series span the range 143 - 485 Hz [59,104].

Under the bis-phosphine heading fall alkyl, [138] alkenyl [152], acyl [153] and hydride derivatives [154]. Additionally, there are a number of studies involving polydentate phosphine systems [131,141,155,156] as well as sterically large phosphine complexes which readily orthometallate [157,158]. The question of ortho-metallation will be taken up in the applications section. A listing of typical 'J(Pt,P) values for a variety of molecular types is shown in Tables 3 - 9 (Chap. G). Coupling to Main Group Metals The literature concerned with the values 'J(M,P) for the case where M is not a transition metal is relatively sparse; however, the onebond metal-phosphorus coupling where the metal comes from group IV a has received some attention.

Further, it has recently been shown that this trans influence criterion may have some validity for five-coordinate ruthenium complexes. 2 ppm appears at relatively low field. Phosphorus trans to phosphorus in such molecules is thought to be found closer to 40 ppm and phosphorus trans to hydride at even higher field [197]. For the SCN, N0 3 , N02 o31p has been cyano complex complexes trans-PtHX(PEt 3 )2' X = CI, Br, I, CN, NCO, NCS, and N3 , a linear correlation of v (Pt-H) and 1J (Pt,p) with reported [48], although in the infra-red series the is an exception.

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31P and 13C NMR of Transition Metal Phosphine Complexes by Paul S. Pregosin, Roland W. Kunz


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