Spectroscopic Properties of Inorganic and Organometallic Compounds provides a unique source of information on an important area of chemistry. Divided into sections mainly according to the particular spectroscopic technique used, coverage in each volume includes: NMR (with reference to stereochemistry, dynamic systems, paramagnetic complexes, solid state NMR and Groups 13-18); nuclear quadrupole resonance spectroscopy; vibrational spectroscopy of main group and transition element compounds and coordinated ligands; and electron diffraction. Reflecting the growing volume of published work in this field, researchers will find this Specialist Periodical Report an invaluable source of information on current methods and applications. Specialist Periodical Reports provide systematic and detailed review coverage in major areas of chemical research. Compiled by teams of leading experts in their specialist fields, this series is designed to help the chemistry community keep current with the latest developments in their field. Each volume in the series is published either annually or biennially and is a superb reference point for researchers. www.rsc.org/spr

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Spectroscopic Properties of Inorganic and Organometallic Compounds Volume 18

A Review of the Recent Literature Published up to Late 1984

By G. Davidson, E. A. V. Ebsworth

The Royal Society of Chemistry

Chapter 1 Nuclear Magnetic Resonance By B.E. Mann, 
Chapter 2 Nuclear Quadrupole Resonance Spectroscopy By K. B. Dillon, 
Chapter 3 Rotational Spectroscopy By S. Cradock, 
Chapter 4 Characteristic Vibrations of Compounds of Main-group Elements By G. Davidson, 
Chapter 5 Vibrational Spectra of Transition — element Compounds By G. Davidson, 
Chapter 6 Vibrational Spectra of Some Co-ordinated Ligands By G. Davidson, 
Chapter 7 M�ssbauer Spectroscopy By S. J. Clark, J. D. Donaldson, and S. M. Grimes, 
Chapter 8 Gas-phase Molecular Structures Determined by Electron Diffraction By D. W. H. Rankin and H. E. Robertson,

CHAPTER 1

Nuclear Magnetic Resonance

BY B. E. MANN

1 Introduction

Following the criteria established in earlier volumes, only books and reviews directly relevant to this chapter are included, and the reader who requires a complete list is referred to the Specialist Periodical Reports 'Nuclear Magnetic Resonance', where a complete list of books and reviews is given. Reviews which are of direct relevance to a section of this Report are included in the beginning of that section rather than here. Papers where only 1H n.m.r. spectroscopy is used are only included when the 1H n.m.r. spectra make a non-routine contribution, but complete coverage of relevant papers is still attempted where nuclei other than protonsare involved. In view of the greater restrictions on space, and the ever growing numbers of publications, many more papers in marginal areas have been omitted. This is especially the case in the sections on solid-state n.m.r. spectroscopy, silicon and phosphorus.

Two books have appeared: 'N.m.r. spectroscopy of organometallic compounds: testing the use of n.m.r. in the chemistry of organic compounds of heavy nontransition metals', and a two-volume book 'N.m.r. of newly accessible nuclei' with volume 1 containing 'Chemical and biochemical applications, while volume 2 contains 'Chemically and biochemically important elements'. These two volumes contain chapters on 'N.M.R. of less common nuclei' and numerous specific chapters which are referenced in the relevant section of this Report.

A number of reviews have appeared including 'Physical methods and techniques. N.m.r. spectroscopy', 'N.m.r. in the eighties: new nuclei, new pulses',' 'N.m.r of other nuclei', 'Multinuclear n.m.r studies of naturally occurring nuclei,' 25Mg, 43Ca, and 113Cd n.m.r. studies of regulatory calcium binding proteins', 'N.m.r. of the first transition series nuclei (scandium to zinc), 'Reaction of heteropolymolybdic acid with metal ions', 'Synthetic and spectroscopic studies of haems and haem proteins', 'New potentialities of n.m.r spectroscopy in the study of catalysis', 'N.m.r. spectroscopy of molten salts', 'Experimental access to the molecular and electronic structures of organo-f-element complexes by n.m.r. spectroscopy', 'Biological aspects of 23Na imaging', and 'N.m.r. studies of intracellular metal ions in intact cells and tissues.

A number of papers have been published which are too broadly based to fit into a later section and are included here. Isotopic effects on X-nuclei screening and X-H(D) scalar coupling in XH4 and XO4 have been determined for 14N, 15N, 27Al, 51V, 53Cr, 69Ga, 71Ga, and 99Tc. An n.m.r. relaxometer for measuring T1 and T2 for 1H, 7Li, and 23Na has been described. The effect of ro-vibration on the chemical shifts of metals has been examined. For d transition-metal ions, 59CO, 99Ru, 103Rh, and 195Pt n.m.r. chemical shifts have been parameterised. Rules have been discussed for predicting arrangements of point charges that give a zero electric field gradient at a point and applied to quadrupolar relaxation. CNDO calculations have been performed on Cr(CO)6, Fe(CO)5, and Ni(CO)4 to determine charge densities, which are consistent with 13C and 17O chemical shifts. 15N Chemical shifts and coupling constants have been determined for terminal N2 complexes of Mo, W, Re, Fe, Ru, Os, and Rh. The 15N shielding showed periodic variation with the central metal, increasing with increasing atomic number. The n.m.r. chemical shifts of some metalloporphyrins have been calculated. 13C n.m.r spectroscopy has been used to demonstrate intramolecular co-ordination of quinone to some capped metalloporphyrins. 1J(M13C) values, taken from the literature for compounds of 199Hg, 207Pb, and 119Sn, increase with increasing hybridisation of the carbon atom attached to the metal. A method of obtaining the valence and non-valence components of the coupling constants was discussed.

2 Stereochemistry

This section is subdivided into ten parts which contain n.m.r. information about Groups IA and IIA and transition-metal complexes presented by Groups according to the Periodic Table. Within each Group, classification is by ligand type.

Complexes of Groups IA and IIA. — Two reviews have appeared: 'Alkali metals' and 'Magnesium-25 and calcium-43'.

The essentially identical 1J(13C, 1H) for the central carbon atom in the contact and solvent-separated ion pairs of some allyl alkali-metal compounds indicates that this coupling constant is not dependent on out-of-plane distortion at C-2. The solution structure of PhLi has been determined from T1 measurements using 7Li/6Li and 1H/2H isotopic substitution methods. For some 6Li and 13C sulphur- and selenium-substituted organolithium derivatives, 1J(13C, 6Li) is observed. 1J(13C, 1H) and 1J(13C, 13C) decrease and 1J(77Se, 13C) increases upon lithiation. The 7Li n.m.r. spectrum of [Li(μ-PR2)]2 is a triplet, while a doublet is observed for Li(PR2)(tmed). The 31P n.m.r. spectra were also reported. 7Li n.m.r. spectroscopy has been used to detect different Li species in human serum. N.m.r. data have also been reported for M- (M = Na, Rb; 23Na, 87Rb), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (7Li, 11B) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), 31p), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), Li(NHAr)(tmed) (7Li) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C).

The 25Mg n.m.r spectra of Grignard reagents depend on concentration and temperature. The 1H and 13C n.m.r. spectra of Mg(anthracene1 indicate maximum interaction with the 9 and 10 position. 1H n.O.e. and 13C n.m.r measurements have been used to determine the structure of 9-((THF)nMg}-10-(A1R1R2H)-anthracene. Using 500 MHz 1H n.m.r spectroscopy, the signals of chlorophyll a have been assigned. 1H T1 measurements and ring-current shifts have been used to investigate dimer structure of chlorophyll. The complexation of Mg2+ and Cd2+ by guanosine nucleotides has been investigated by 31P n.m.r. spectroscopy. Intracellular calcium measurement has been described using 19F n.m.r. signals of fluorine labelled chelators. Prothrombin fragment 1-membrane interactions have been studied using 43Ca n.m.r. spectroscopy. The n.m.r. quadrupole - coupling constants for 43Ca bound to either a-lactalbumin or trypsin is significantly smaller than for EF-hand Ca2+ binding proteins. The 113Cd chemical shifts indicate that only O ligands are involved in metal-ion binding. The conformation of the barium perchlorate complex of valinomycin has been investigated using 13C n.m.r. spectroscopy. N.m.r. data have also been reported for (Me3Ge)2Mg.2DME (13C) and MgCl2.TiCl4.4MeCO2Et (13C).

Complexes of Groups IIIA and IVA, the Lanthanides, and Actinides. All coupling constants have been determined for (η5-C5H5)2Sc(BH4) using 11B and 45Sc n.m.r. spectroscopy. The exchange process in (η5-C5D5)2Zr(BH4)2 has been reinvestigated using 2H n.m.r. spectroscopy. [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] shows [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] of 20 and 36 Hz. The 31P n.m.r. spectra of [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (M = Sc, Y, Lu, Pr) have been measured and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] determined. The binding of [UO2]2+ to L-histidine, imidazole, and N-methylimidazole in aqueous and MeOH solutions has been studied by 1H and 13C n.m.r. spectroscopy. Similarly the interaction with pyridoxal has been studied. 17O n.m.r. spectroscopy shows three peaks for [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII], [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]. The 31p n.m.r. spectrum of [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] shows [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] of 9 to 19 Hz, and the mechanism of coupling was discussed. The first observation of 235U n.m.r. spectroscopy has been reported for UF6: g(235U) = 492.6 [+ or -] 0.2 rad s-1 G-1. N.m.r. data have also been reported for Sc(RCOCHCOR1)3 (13C, 19F, [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (M = La, Lu; 13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C, 31P), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C, 31P), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (15N, 31P), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13P) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (19F), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (M = Th, U; 31P).

13C and 31P n.m.r. spectra show that ZrMe4(dmpe)2 is rigid at -60�C. In [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]. The 47Ti and 49Ti n.m.r. chemical shifts of a series of titanocene derivatives have an inverse relation to the Ti(2p3/2) binding energies. The 47Ti and 49Ti n.m.r. spectra of some mono- and bis-cyclopentadienyl compounds have been reported. The 91Zr chemical shifts of organozirconium compounds with π-ligands such as η8-C8H8, η5-C5H5, η3-C3H5, and η8-C4H6 involve distinctly different ranges for 16- and 18-electron environments at zirconium. 1H n.O.e. and 13C n.m.r. spectroscopy have been used to differentiate between isomers of [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]. The 13C n.mr. spectrum of [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] shows a mixture of cisoid and transoid. Ti, Zr, and Hf can be simultaneously determined in solution as heteropoly complexes with molybdophosphate by 31P n.m.r. spectroscopy. N.m.r. data have also been reported for [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (M = Cr, Mo, W; 13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (17O), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (11B, 13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] 13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] 13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (M = Si, Ge, Sn; 13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] 13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (M = Ti, Zr, Hf; 13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] 13C), 31P, But4Zr (13C, 91Zr), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C, 31P), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), 31P), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (31P) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (31P) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (31P) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (M = Zr, Hf; 13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (E = S, Se; 13C, 77Se) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (77Se) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (M = Ti, Zr; 13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (31P) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C) and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (19F).

Complexes of V, Nb, and Ta. — 51V n.m.r. spectroscopy is a useful probe for studying the hydridation of [V(CO)5]3-. 93Nb n.m.r. spectra were also recorded for [HNb(CO)5]2-. Even at 120�C, [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is not fluxional according to 1H and 13C n.m.r. spectra. For [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] correlates with the electronegativity of the substituents. Shielding of 51V decreases in the order Sn Ge > Pb for [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] and related compounds. 31P chemical shift data for the complexes [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] have been interpreted by varying [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] contributions to the bond-order density matrix in the paramagnetic term. N.m.r. data have also been reported for [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C, 51V), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (51V), and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C, 31P).

The presence of X in the fist coordination sphere of VX(NO)2L3 (X = Cl, Br, I) was determined by the normal halogen dependence of the 51V shie1ding. V(NR)Cl3 and its adducts display unusually high-frequency 51V chemical shifts. 51V line widths in this series are typically > 500 Hz. The feasibility of n.m.r. of various nuclei during the study of iso- and hetero-poly compounds of V(V), Mo(VI), and W(VI) has been studied. N.m.r. data have also been reported for oxovanadium(V) meso-tetraphenylporphyrin (51V), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (M = Ta, Nb; 13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (31P), oxosulphatovanadates (51V), [V2O3]4+ (51V) [(n5-C5Me5)Rh(cis-Nb2W4O19)]2- (13C, 17O, 183W), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (183W), and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (19F).

Complexes Cr, Mo, and W. — 13C and 31P n.m.r. spectra show that MoH2(PMe3)5 is fluxional, even at 190K. The 1H n.m.r spectrum of [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] shows [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] compared with 43.2 Hz in HD. The 31P n.m.r. spectrum was also recorded. 13C n.m.r. data and CO stretching force constants of 23 anionic and neutral W(CO)5L have been given. Changes in δ(13CO) arise mainly from the QAA and QAB terms. On the basis of [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] of the CO group, the trans-influence series is [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII], P(OMe)3, PR3 > H-, [CH3]-, [NCS]-, [O2CR]-, py > RNH2, [S2CR]-, AsR3 > SbR3, [SH]- > Cl- > Br- > I-. N.m.r. data have also been reported for [DM(CO)4L]- (M = Cr, Mo, W; 2H), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (M = Cr, Mo, W; 13C, 31P), MH6(PR3)3 (M = Mo, W; 31P),[MoH2(dmpe)3]2+ (31P), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (31P), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (15N, 31P) [MoH(CN)7]4- (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (31P), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C, 31P), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (31P), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (31C, 31P) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (19F, 31P), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (31P) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C, 31P) and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (13C, 31P, 195Pt).

(Continues...)

Excerpted from Spectroscopic Properties of Inorganic and Organometallic Compounds Volume 18 by G. Davidson, E. A. V. Ebsworth. Copyright � 1985 The Royal Society of Chemistry. Excerpted by permission of The Royal Society of Chemistry.
All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.
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