Reflecting the growing volume of published work in this field, researchers will find this book an invaluable source of information on current methods and applications.

Excerpt. � Reprinted by permission. All rights reserved.

Spectroscopic Properties of Inorganic and Organometallic Compounds Volume 26

A Review of the Recent Literature Published up to Late 1992

By G. Davidson

The Royal Society of Chemistry

Chapter 1 Nuclear Magnetic Resonance Spectroscopy By B. E. Mann, 1, 
Chapter 3 Rotational Spectroscopy By J.H. Carpenter, 226, 
Chapter 4 Characteristic Vibrations of Compounds of Main Group Elements By G. Davidson, 253, 
Chapter 5 Vibrational Spectra of Transition Element Compounds G. Davidson, 289, 
Chapter 6 Vibrational Spectra of Some Co-ordinated Ligands By G. Davidson, 325, 
Chapter 7 Moessbauer Spectroscopy By S.J. Clark, J.D. Donaldson, and S.M. Grimes, 371, 
Chapter 8 Gas-phase Molecular Structures Determined by Electron Diffraction D.W.H. Rankin and H.E. Robertson, 463,

CHAPTER 1

Nuclear Magnetic Resonance Spectroscopy

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, 2H, 19F, and/or 31P NMR spectroscopy is used are only included when they make a non-routine contribution, but complete coverage of relevant papers is still attempted where nuclei other than these are involved. In view of the greater restrictions on space, and the ever growing number of publications, many more papers in marginal areas have been omitted. This is especially the case in the sections on solid-state NMR spectroscopy, silicon and phosphorus.

One book has been published which is relevant to this review:- 'Studies in Inorganic Chemistry, 13: Transition Metal Nuclear Magnetic Resonance', ed. by P.S. Pregosin.

Several relevant reviews have been published, including 'Molecular hydrogen (η2-H2) complexes of transition metals, 'Metal NMR chemical shifts of polynuclear early transition metal complexes with direct metal-metal bonds' 'Electronic states of transition metal complexes and the electronic mechanism of metal-nucleus NMR chemical shifts' 'Synthesis and characterization of heterometallic carbonyl cluster anions', 'Applications of spectroscopic measurements to homogeneous catalysis', and 'Use of NMR spectroscopy in the study of glass structure. I. NMR spectroscopy of silicate solutions'.

A number of papers have been published which are too broadly based to fit into a later section and are included here. The use of 1J(13 C1H) as a criterion of agostic bonding has been examined for C2H4 coordinated to early transition metals. N NMR spectroscopy has been used to probe the bonding, bending and fluxionality of the imido ligand on Ta, Mo, W, Re, and Os. Inorganic phosphates have been analysed quantitatively using 31P NMR spectroscopy.' The solution and solid state conformations of Ni2+, Zn2+, Cd2+, and Hg2+ have been investigated both in solution and the solid state by 13C NMR spectroscopy and in solution by 199Hg NMR spectroscopy. The relaxation and dynamical properties of water in partially filled porous materials have been investigated using NMR techniques. The measurement of I = 5/2 relaxation in biological and macromolecular systems using multiple-quantum NMR techniques has been described and applied to 17O, 25Mg, and 27Al. The characterisation of compounds using 13C and 29Si NMR spectroscopy has been discussed, NMR data have also been reported for 1-Me3Si-cycloocta-1,5-diene complexes with RhI, PdII, PtII, and AgI, (13C), pyridoxalisonicotinoyl hydrazone complexes with some 3 d metal ions, (13C), 17U, Mo, W, Re, Rh, and Pd complexes of (1), (13C), NiII and ZnII complexes of (2), (13C), salicylaldehyde-2-aminobenzophenone-2-thenoylhydrazone complexes with 3d metal ions, (13C), [M(RNCMeCH2CMe2NHR)]2+, (M = Co, Ni, Zn, Cd; 13C), complexes of metals with 1,15-diaza-3,4:12,13-dibenzo-5,8, 11-trioxacyclooctadecane, (13C), and metal complexes of 4-acyl-5-pyrazolone, (13C).

2 Stereochemistry

This section is subdivided into eleven parts which contain n.m.r. information about Groups 1 and 2 and transition-metal complexes presented by Groups according to the Periodic Table. Within each Group, classification is by ligand type.

Complexes of Groups 1 and 2. — Reviews entitled 'NMR of lithium-6 enriched organolithium compounds', and 'Applications of NMR in sensory science', which includes Na NMR spectroscopy, have appeared.

The 13C NMR spectrum, including IJ(13 C6Li), has been reported for [LiCH2NMeCH2 CH2-NMeCH2CH2NMe2]. 6Li-6Li COSY of PriLi/sparteine in Et2O shows coupling between two sites. The 13C NMR spectrum was also reported. The structures of [Ph3CLi] and [Cs(3-Et-3-heptoxide)] in solution have been studied using 6Li, 1H HOESY, 133Cs, 1H HOESY, and 1H, 1H ROESY, and close contacts identified. 6Li,1H HOESY has been used to determine Li — H distances to an accuracy of ca 0.2 � in [C2H3Li.thf]4. The solution structures of [[Li(TMEDA))2(Me3Si-CH=CH)2] and [(Li(TMEDA))2(Me3SiCH=CMe)2] have been determined using 7Li, 1H HOESY. 7Li T1 measurements were also reported. The one-dimensional and two-dimensional 6Li, 6Li INADEQUATE experiments have been described and applied to compounds such as (E)-1-Li-2- (2-LiC6H4)-1-Ph-hex-1-ene. [2-Me2N-6-Bu1 O-C6H3Li] shows extreme distortion of the benzene ring from hexagonal at Li and a very low 1J(13C13C) of 27.8 Hz results. The 6Li NMR spectrum was also recorded. 13C NMR spectroscopy, 6Li,1H HOESY, and HETCOR have been used to determine the structure of (3). 6Li, 13C, and 15N NMR spectroscopic studies have been used to show that [LiNPri2] in neat TMEDA is a dimer. Heteronuclear multiple quantum correlation has been used to correlate 6Li and 15N chemical shifts of mixed aggregates of [6Li, 15N] lithium 2,2,6,6-tetramethylpiperidide with 6LiBr, 6LiCl, and 6Li(OC6H11). The aggregated forms of [LiNPri2] and Li 2,2,6, 6-tetramethylpiperidide in THF have been unambiguously shown to be dimers rather than trimers or higher oligomers by 6Li detection of 15N homonuclear zero quantum coherence. 6Li, 1H HOESY and 13C NMR spectroscopy have been applied to (4). 13C NMR spectroscopy has been used to study the structure of the complex of CH2(CH2O-I-C6H4-2-OCH2) 2CHCH2OP(O)(OH)-(OBun) with Li+. A method has been developed to measure Li+ concentrations in the human brain using in vivo1H and 7Li NMR spectroscopy. NMR data have also been reported for [LiCH(CN)2(H2O)(TMEDA)], (1Li, 1H HOESY, 13C), [(PhC=CLi)4 (TMEDA)2], (13C),' (5),( 13C), (6), [C6H4CH=CHSnBun2], (6Li, 13C, 119Sn), [Li(C6H2Ph3). 2Et2O], (13C),[(Li(2,4,6-But3 C6H2))(LiP(H)(2,4,6-But3C6 H2))]2, (7Li),45 [(Et2N)Ph2 SiLi], (13C), [(2,4,6-Me3C6H2)H2 GeLi], (13C), [((Et2O)Li)2(Ph(Me2N)BB (NMe2)Ph)], (11B), [Li(l2-crown-6)][(THF)Li (�-NSiMeBut2)2SiBut], (7Li, 13C, 29Si), (7), (6Li, 15N) [Li(PhNPPh2)(OEt2)]2, (7Li), [((BUtNPNC6H2BUt3,2,4, 6) Li)n(Et2O)m], (7Li), (8), (7Li, 13C, 29Si), [(Me3SiN)2-SPhLi]2 OEt2, (6Li, including 6Li, 1H HOESY, 7Li, 13C, 29Si), (9), (7Li, 11B, 13C), and LiHC(O)PH.DME, (13C).

23Na NMR spectroscopy has been used to study the binding of Na+ to N(CH2CH2N=CHXCH=N-CH2CH2)3N, X = 2,5-furyl, 2,6-pyridyl, 2,5-pyrole, or 2,6-4-Me-phenol. The conformation of the potassium salt of lasolocid has been determined by 1H and 13C NMR spectroscopy. K NMR spectroscopy has been used to show the presence of K- and [K(cryptand[2.2.2])]+, when K is dissolved in cryptand. The NMR relaxation behaviour and quadrupole coupling constants of Na and 39K in glycerol have been studied and compared with 39K tissue data. NMR data have also been reported for [NaNPri2], (13C), and [MN(SiMe3) 2], (13C, 29Si, 133C).

1J(9Be1H) has been determined for the first time in [HB(3-BUtC3H2N2)3BeH]. The 9Be and 13C NMR spectra were also recorded. The 9Be chemical shift of [Be(O2C6H4) 2]2- is at δ7.5, indicative of catecholate coordination. The 13C NMR spectrum was recorded. NMR data have also been reported for [Me2Al(�-NEt2)2MgMe]2, (13C, 27Al), [(C5H5)MgOCH2 CH2NMe2], (13C),[(C5Me5) 2M]. [M(N(SiMe3)2)22] 22, (M = Ca, Sr, Ba; 13C), [(C5Me5)CaN(SiMe3) 2. (THF)3], [(C5Me5)2BaN (SiMe3)2]-, (13C), [(C5 Me5)Ca(OC)2Zr(η5-C5Me5)], (13C) [Ba(fluorenyl)2-(HMPA)2], (13C), [(η5-fluorenyl)2Ba], (13C), [(η3-HB(3-ButC3H2N2) 3)MgO2R], (13C), (17O), [(PhC(NSiMe3)2]2Mg(NCPh)], (13C, 29Si), [(PhNCPh=CPhNPh)2Mg], (13C), (10), (13C), [Me2Ag(CN)(MgBr)2], (13C), [(dibenzopyrryl)2Ca(NC5H5)2], (13C),[(PhC(NSiMe3)2}2M(THF)2], (M = Sr, Ba; 13C, 29Si), [Ca{PhC(NSiMe5) 2)2.2THF], (29Si),(11), (13C), [M(ethyl acetoacetato)2], (M = Mg, Ca; 13C), [M(OC6H2BUt2-2,6-Me-4)2 (THF)2], (M = Ca, Ba; 13C), [M(OC6H2 But3-2,4,6)2]2, (M = Ca, Sr, Ba; 13C), [Ba2(OSiBu3)4 (THF)] (13C), [Ba(dpm)2(OEt2)]2, (13C), [Ba(dpm)2(2,5,8,11,14-pentaoxaheptadecane)], (13C), and [M(TeSi(SiMe3)3)2], (M = Mg, Ca, Sr, Ba; 125Te).

Complexes of Group 3, the Lanthanides, and Actinides. — The 31P NMR spectrum of the Y complex of 1,4,7,10-((HO)P(O)(Me) CH2)4-1,4,7,10-tetra-azacyclohexadecane shows Y coupling. 13C T1 measurements have been used to determine the structure of lanthanide complexes of oxyethylene glycols. NMR data have also been reported for [(η5-C5Me 5)2Y2(OC6H3But2-,2,6)2(�-H)(�-CH2CH2 CH3)], (13C), [{Y(η13-C3H5) [N(SiMe2CH2PMe2)2}]2 (�-Cl)], (13C), [(η5-C5H5) 2Y(η5-2-Me2NC5H3-C, N) Fe(η5-C5H5)], (13C), [(η5-C5H4SiMe3)2, Y(OMe)] 2, (13C), (12), (13C), [(η5 -C5Me5)La(NHEt)(NH2Et)], (13C), [{(THF) 2Li(�-Cl) 2}2(η5 -C5H4Me)La-(THF)], (13C), [(η5 -C5Me5)2 La(OCMe2)(OCEt=CHMe)], (13), [(η5-C5H5)(η5 -C5H4PPh2)2-La(THF)], (13C) [ScCl2(18-crown-6)]+, (13), [La(acetone isonicotinoylhydrazone)3]13+, (13C, 139La), [YCu(OSiPh3)4(PMe2Ph)], (29Si, 89Y), [(η5-C5H5)Co{P(OEt) 2 O} 3Y[(η5-C5H5) Co{P(O)(OEt) 2}2{P(O) 2(OEt)}] 2Y {OP(OEt) 2}3Co(η5-C5H5)], (13C), [La[diethylene glycol di(o-hydroxyphenyl)ether)] 3+, (13), [Ce(OCBut3)3(O2CPh)], (13C), [Ce(OPri)3(�-OC2H4 NMeC2H4NMe2)]2, (13), [(η5-C5Me5)2Sm(THF)(N2 H4)][BPh4], (11B, 13C), [(η5-C5H5)2LuCh2 CH2CH2NMe2], (13C), [(η5-C5H5 Lu(Ch2CHMeCH2 NMe2)Cl(THF)2], (13C),[{η5 -C5H3(SiMe3)2-1,3}} 2Yb]∞, (13C, 29, 171 Yb), [{Ph2P(NSiMe3)2}2 Yb(THF) 2], (171Yb), [Yb{Al(OPri)4}2], (171Yb), [Yb(OC6H2But2- 2,6-Me-4)2(THF)3], (13C), [Y(OCPri2CH2OEt)3], (13C, Y), [Yb(TeC6 H2Me3-2,4,6)2(THF)n], (13)C, 125Te, 171Yb), [(η5-C5Me5) 2U(NPh)2], (13C), and (13), (13C).

Complexes of Group 4 — 1H NOE measurements on [(PhCH2)2Zr(η5-C5H4 But)2] show small enhancements. When the experiment is run in the presence of a polymer to increase the viscosity, there are large negative NOES to everything. NMR data have also been reported for (14), (R = H 13C), [{(η5-C5Me5)2MH}2 {�-(CH2)5}], (M = Zr, HF; 13C), [(η5-C5H5)2Ti(CH3 (O2CR)], (13C), [(η5-C5 H5)2Ti(CH2Ph)2], (13C), [(η5-C5H5)(η5 -C5Me5)M(CH2PPh2)2], (M = Ti, Zr; 13C), [(η5-C5Me5) 2TiR1R2], (13C), [RTi(Me2 SiCH2CH2)3N], (M = Cl, Bun; 13C), [(η5-C5Me5)2 TIR1R2], (13C), [RTi(Me2SiCH2 CH2)3N], (M = Cl, Bun; 13C), (η5-C5Me5)2Ti(CMe=CHR)Cl], (13C), [(2,6-Ph2C6H3O)2 TiCEt=CEtC(H)(Ph)NCH2Ph], (13C), [(η5 -C5H5)2Ti(PMe3)=C=C=Ti(PMe3) (η5-C5H5)2], (13C), [(η5-C5H5)Ti(C[equivalent to]CSiMe3)] 2, (13C), [(η5-C5H4SiMe3) 2Ti(C[equivalent to]CPh-η2)2Ni(CO)], (13C) [(η5-C5H5)2Zr(η2 -CMeNBut)(�-O,O'-O2CHCF3)ZrMe (η5-C5H5)2],(13C), [(η5-C5H5)4Zr2(� -CH3)(�-C=CMeR)]+, (13C), [(η5-C5H5)2Zr(�-η1: η2-PhC[equivalent to]CPh) (�-CH3)AlMe2], (13C), (14), (R = Me; 13C), [(η5-C5 H5)4Zr2Et2(�-C=CCMe2)], (13C), (15), (13C), [{(η5-C5 H5)2EtZrOCH2}2CHOZrEt [(η5-C5H5)2], (13C), (16), (13C), (17), (13C), [(η5-C5 H5)2Zr{CH(Me)(6-ethylpyrid-2-yl)} (CO)]+, (13C), [rac-C2H4(indenyl-η5) 2Zr{CH(SiMe2Cl)(SiMe3)}][Al2 Cl6.5Me0.5], (13C), [(η5 -C5H5)2ZrClC(NBut)C[equivalent to] Cru(η5-C5H5)(PMe3)2], (13C), (18), (13C), (η5-C5 Me5)2Zr{Sn[CH(SiMe3)2]2} 2], (13C), Sn), (19), (13C), [(η5 -C5Me5)2Zr(CH=CRC[equivalent to]CR)] +, (13C), [(η5-C5H5) 2ZrSGeMe2-2-C6H4], (13C), [(η5-C5H5)2Zr(2-C4 H3E)2], (E = O, S; (13C), [{(η5 -C5H5)Zr(�-C[equivalent to]CPh)}2 (�-η5,η5-C10H8)], (13C), [(η5-C5H5) (η5-C5Me5)Hf(SiH2Ph)Cl], (13C, 29Si), [(η5-C5H5) (η5-C5Me5)Hf{Si(SiMe3)3} Me], (13C, 29Si).

(Continues...)

Excerpted from Spectroscopic Properties of Inorganic and Organometallic Compounds Volume 26 by G. Davidson. Copyright � 1993 The Royal Society of Chemistry. Excerpted by permission of The Royal Society of Chemistry.
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