DISCUSSIONS OF THE FARADAY SOCIETYN 0 . 4 7 1969Bonding inMetallo-organic CompoundsTHE FARADAY SOCIETYLONDONDistribution arrangements overleaTHE SOCIETY’S PUBLICATIONSTransactions of the Faraday SocietyDiscussions of the Faraday SocietySymposia of the Faraday SocietyPublished monthlyNormally published twice a yearPublished annuallyMEMBERSof the Faraday Society receive current issues of bothTransactions and Discussions free on publication, and ofSymposia at a reduced price on request. 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(Australia) LtdSydney: 20 Loftus StreetMelbourne: 343 Little Collins StreetBrisbane: 240 Queen StreetToronto: 14 Curity Avenue, 314New Zealand: Butterworth & Co.(New Zealand) Ltd.Wellington: 4915 1 Ballance StreetAuckland: 35 High StreetSouth Africa: Butterworth & Co. (South Africa) Ltd.Durbun: 33/35 Beach Grove Canada: Butterworth & Co. (Canada) LtdU.S.A.: Discussions and Symposia-current and back issues :Enquiries to 88 Kingsway, London. WC2.Complete Volumes 140:Johnson Reprint CorporationNew York: 1 1 1 Fifth AvenueA GENERAL DISCUSSIONONBonding inMetallo-orgunic Compounds25th-27th March, 1969A GENERAL DISCUSSION on Bonding in Metallo-organic Compounds was heldat the University of Cambridge on the 25th, 26th and 27th March 1969. ThePresident, Prof. G. Gee, C.B.E., F.R.S. was in the Chair and 110 members andothers were present.Among the overseas visitors were:Dr. and Mrs. J. H. AmmeterDr. H. Arzoumanian FranceDr. P. Baekelmans BelgiumProf. T. L. Brown U.S.A.Prof. F. A. Cotton U.S.A.Prof. L. F. Dahl U S A .Dr. W. K. Glass EireProf. J. A. Ibers U.S.A.Dr. J. M. Larnaudie FranceProf. P. M. Maitlis CanadaDr. A. R. Manning EireDr. A. May ItalyDr. J. Messier FranceDr. K. W. Muir U S A .Dr. J. F. Ogilvie CanadaProf. R. Pettit U.S.A.Dr. R. Prins NetherlandsSr. R. M. Rawlinson EireDr. G. L. D. Ritchie AustraliaMr. A. Van der Ent NetherZandsProf. L. L. Van Reijen NetherlandsDr. P. B. Venuto U.S.A.Dr. J. L. Verbeek NetherlandsProf. W. Zeil GermanySW'ifzerlan0 The Faraday Society and Contributors 1969Printed in Great Britain at the University Press, AberdeeCONTENTSPage 720273748535971798493107112121126136144General Introduction-From Ferrocene to Uranoceneby G.A. GamlenThe Geometries of and Bonding in Certain Transition Metal Complexesby R. McWeeny, R. Mason and A. D. C. Tow1Approximate Molecular Orb it a1 Calculations on Met allo- organ ic Complexesby 1. H. Hillier and Mrs. R. M. CanadineA SimpliFed Molecular Orbital Model *fop. Octahedral Metal CarbonylCompounds by Wayne P. Anderson and Theodore L. BrownCorrelation between Crystal Structure and Carbonyl-Bond StretchingVibrations of Methyl Benzene Transition Metal Tricarbonylsby H. J. Buttery, G. Keeling, S. F. A. Kettle, I. Paul and P. J. StamperInteractions of Carbonyl Groups in Compounds Containing Metal-MetalBonds by M.L. N. Reddy and D. S. UrchGENERAL DIscussIoN-Prof. J. N. Murrell, Prof. R. Mason, Mr. A. F.Orchard, Dr. 1. H. Hillier, Mrs. R. M. Canadine, Prof. J. N. Murrell,Dr. D. S. Urch, Dr. J. R. Miller, Dr. G. Bor, Prof. N. N. Greenwood,Dr. A. J. RestExtension of the Woodward-Hoflman Rules to Organometallic Systemsby R. Pettit, H. Sugahara, J. Wristers and W. MerkSome Bonding Questions Prompted by Studies of the Fluxional MoleculeTriscyclopentadienylnitrosylmolybdenum by F. A. CottonGeometries of Transition Metcll Complexes Containing Simple Alkenesby Ljubica ManojloviC-Muir, Kenneth W. Muir and James A. IbersOrganometallic Chalcogen Complexes. Part 18.-A Diluted Single CrystalE.S. R. Study of the Electronic Structure of Tricobalt EnneacarbonylSulphide: Antiaromaticity in a Transition Metal Carbonyl Cluster System.by Charles E.Strouse and Lawrence F. DahlGENERAL DIscussIoN-Mr. A. Hamnet, Dr. D. S. Urch, Dr. R. Pettit, Mr.C. H. Campbell, Prof. F. A. Cotton, Mr. K. F. Wagstaff, Dr. H. A. 0.Hill, Prof. J. A. Ibers, Dr. Michael GreenStudy of the Bonding in Pentacarbonylmariganese Deriuatiues by PhotoelectronSpectroscopy by S. Evans, J. C. Green, M. L. H. Green, A. F. Orchard andD. W. TurnerPhotoelectron and Ultra-violet Spectroscopy of Transition Metal CarbonylDerivatives by P. S. Braterman and A. P. WalkerMossbauer Spectra, Structure, and Bonding in Iron Carbonyl Derivativesby R. Greatrex and N. N. GreenwoodBonding and Structure in Fe(II) Low-spin Compounds using the MossbauerE’ect by G.M. Bancroft, M. J. Mays and B. E. PraterGENERAL DIscussIoN-Mr. A. F. Orchard, Dr. M. G. Clark, Dr. M. J.6 CONTENTS149157165172178183190199205Mays, Prof. N. N. Greenwood, Dr. G. M. Bancroft, Dr. A. J. Rest, Dr.H. A. 0. HillStructure of Molecules of Type (CH,),X-C=C-Y (X = Si, Ge, Y = H,Cl) determined by Electron Diffractionby Werner Zeil, Joachim Haase and Marwan DakkouriElectron Impact Studies on Organo-Beryllium and -Aluminium Compoundsby D. B. Chambers, G. E. Coates and F. GlocklingSome Properties of Metal Complexes Containing One Metal-Carbon Bondby H. A. 0. Hill, J. M. Pratt and R. J. P. WilliamsFormation of Cobalt-Carbon a-Bondsby Michael Green, J. Smith and P. A. TaskerEvidence for a n-Donor Eflect in Transition Metal-Carbon Bonds from H-DCoupling Constantsby J. D. Duncan, J. C. Green, M. L. H. Green and K. A. McLauchlanBonding in Hexamethyl-dialuminium and Related Compoundsby K. A. Levison and P. G. PerkinsComplexes of Carbon Suboxide with Silver: a new Chemistry of SiIuerby E. T. Blues and D. Bryce-SmithGENERAL DrscussIoN-Prof. N. N. Greenwood, Dr. I. H. Hillier, Prof.P. G. Perkins, Prof. Theodore L. Brown, Dr. H. A. 0. Hill, Dr. M. G.Clark, Dr. Michael Green, Dr. J. F. Ogilvie, Dr. M. IT. Newlands, Prof. D.Bryce-Smit hAUTHOR INDE