Metal-metal bonding

316 Pages·2010·7.27 MB·English

by  J. F. Berry (auth.)

136
Structure and Bonding
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Metal-Metal Bonding
Volume Editor: Gerard Parkin
With contributions by
· · · ·
B.B. Averkiev J.F. Berry A.I. Boldyrev T. Cadenbach
· · · ·
M.H. Chisholm R.A. Fischer G. Frenking C. Gemel
S. Gonzalez-Gallardo· M.S. Hill · v. Hopffgarten ·
C. Ni·G. Parkin · P. P. Power· G. Prabusankar ·
A.P. Sergeeva · C.A. Tsipis
123
Prof.Dr.Gerard Parkin
Columbia University
Dept. Chemistry
3000 Broadway
New York NY 10027
USA
[email protected]
ISSN0081-5993 e-ISSN1616-8550
ISBN978-3-642-05242-2 e-ISBN978-3-642-05243-9
DOI10.1007/978-3-642-05243-9
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The series Structure and Bonding publishes critical reviews on topics of research
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Preface
Despite the factthatcompoundsthatfeaturemetal–metalbondshavebeenknown
for many decades, interesting discoveries continue to be made at a rapid pace.
The purpose of this volume is to highlightsome of these recent advancesin both
maingroupandtransitionmetalchemistry,andanoverviewofthetopicscoveredis
providedhere.
Berry describestransition metalcompoundsin which there are chainsof metal
atoms. Such compounds are often considered as potential molecular wires for
molecular electronic applications and the conductance of these compoundsat the
molecular level is discussed. In addition to compoundsthat feature homometallic
chains,thosewithheterometallicchainsarealsodescribed.
Chisholmdescribesadifferentapproachtolinkingtogethermetalcenters,namely
one in which quadruply bonded dimolybdenumand ditungsten moieties are elec-
tronically coupled via a conjugated (cid:2)-system of an organic bridging ligand. The
types of structures obtained include loops, triangles and squares of the dinuclear
moieties.
Ni and Power describe the use of sterically demanding terphenyl ligands to
synthesizetransitionmetaldinuclearcompoundsoftypeArMMArthathaveexcep-
tionallyshortM–MbondsandhighM–Mbondorders.Forexample,ArCrCrAris
describedaspossessingaquintupleCr–Crbond.
Theevaluationofthemetal–metalbondorderisoftenanimportantcomponentin
thedescriptionofcompoundswithmetal–metalbonds,andParkinevaluatesthevar-
iouselectron-countingproceduresthatareusedtopredictmetal–metalbondorders
intransitionmetalcompoundsthatfeaturebridginghydrideandalkylligands.
Attheinterfaceofmaingroupandtransitionmetalchemistry,Frenking,Fischer
etal.describerecentdevelopmentsinwhichmonovalentgalliumspeciescanserve
asligandsfortransitionmetals,therebyaffordingavarietyofcompoundsthatfea-
ture M–Ga bonds.Furthermore,many of these compoundswith M–Ga bondscan
beconvertedintocompoundsthatfeatureM–Znbonds.Also,withrespecttomain
group chemistry, Hill discusses catenated compounds of Group 13–15 elements,
whichfeaturechainsofM–Mbonds.
ix
x Preface
Finally,theconceptofaromaticityandantiaromaticityincompoundsthatfeature
rings of metal atoms is discussed by Tsipis, who focuses on rings of main group
metalatoms,andbyBoldyrevetal.,whofocusontransitionmetalcompounds.
NewYork GerardParkin
January2010