熊仁根教授

发布时间:2013-01-24访问次数:
Ren-GenXiong
E-mailxiongrg@seu.edu.cn
Faxnumber86-25-52090626
Mobile86-13914721276
NationalityChinese
AddressOrderedMatterScienceResearchCenter[OMSRC],
SoutheastUniversity[SEU],Nanjing211189,PRChina
Diplomas
BachelordegreeinChemistry,1982-07:
MasterdegreeinOrganicChemistry,1987-12:
DoctordegreeinMechanicEngineering,1994-07:
ResearchActivities(TimesNewRoman,11pt)
Ren-GenXiongwhodidthreepostdoctoralpositionsinNanjingUniversity(1994),PuertoRicoUniversity(1996),andBrandeisUniversity(1997),respectively,attheendof1998,returnedtoNanjingUniversitywherehestayedandbecameafullprofessor(TheCheungKongScholarsProgramin2004).Intheendof2006hemovedtoSoutheastUniversity,whereheisProfessorofChemistrypresentlyandthedirectorofOrderedMatterScienceResearchCenter.
RecentlyRepresentativePublications:
1.XiongR.-G.*,etal.,“Dielectricanisotropyofahomochiraltrinuclearnickel(II)complex.”;“3DframeworkcontainingCu₄Br₄cubaneasconnectingnodewithstrongferroelectricity.”;“DiscoveryofNewFerroelectrics:[H(₂)dbco](₂)·[Cl^-₃]·[CuCl₃(H₂O)(₂)]·H₂O(dbco=1,4-Diaza-bicyclo[2.2.2]octane)”;“SupramolecularBola-LikeFerroelectric:4-MethoxyaniliniumTetrafluoroborate-18-crown-6”J.Am.Chem.Soc.,2007,129,5346;2008,130,10468;2009,131,,42;2009,131,12544;2010,132,7300;2011,133,12780;2012,134,websiteavailable.“Hydrogen-BondedFerroelectricsBasedonMetal-OrganicCoordination.”;“NewFerroelectricsBasedonDivalentMetalIonAlum.”;
2.XiongR.-G.*,etal.,“Highlystableolefiin-Cu(I)coordinationoligomersandpolymers.”;“Insituhydrothermalsynthesisoftetrazolecoordinationpolymerswithinterestingphysicalproperties”;“Metal-organiccomplexferroelectrics”,Chem.Soc.Rev.,2005,34,208;2008,37,(1),84;2011,40,3577.
3.ZhangW*andXiongR.-G.*,“FerroelectricMetal-OrganicFrameworks”,Chem.Rev.2012,112.1163.

SymmetryBreakingandPhysicalPropertyAnomaliesnearTc
Ren-GenXiong,OMSRC,SEU,Nanjing,PRC
Withthevirtueofitssymmetryselectivityopticalsecondharmonicgeneration（SHG）isparticularlyattractiveforprobingtheferroelectricstate.Thesecond-ordernonlinearopticalpolarizationisgivenbyP(2w)=c⁽²⁾E²(w)withelectricfieldsE(w)oftheincidentlightwaves.Withthesecond-ordersusceptibilityc⁽²⁾º0fornoncentrosymmetricsystemsonly,SHGeffectdirectlycouplestothesymmetry-breakingferroelectricorderparameter.Consequently,undertheexternalstimuliconditionssuchas,temperature,pressure,electricfield,strainandmagneticfield,theirdependenceofc⁽²⁾becomesmoreandmoreimportanttoadjustwhetherthereexistsasymmetrybreakingoccurrenceornotbecausemostofmolecule-basedcompoundscontainmanyH-atomswhichislesscontributiontoX-raydiffractionandsolvetheirstructurebytheoreticadditionH-atomsinShelxl-97program.Ontheotherhand,mostofferroelectricphasetransitionsinvolvetwincrystal.Thedifferencebetweencentro-andacentro-symmetrystructuresisisotropicbyX-raydiffractionmethod(neutron-diffractionisexceptional).So,thephysicalpropertyanomalynearphasetransitionpoint(especiallytemperature,Tc)isacrucialcriteriontomakeacorrectchoice.Inthispresentation,wemainlyfocusedonthetemperature-dependentc²⁾,piezoelectriccoefficient,anddomains.
Figure1Thediagramsoflateralamplitude(topleft),phase(topmiddle),topology(topright),verticalamplitude(bottomleft)andphase(bottommiddle)ofTGStakenbyPFM.PFM(PFM=piezoelectricforcemicroscopy,TGS=triglycinesulphate).
References:
1.W.Zhang,R.-G.Xiongetal.,Angew.Chem.Int.Ed.2010,49,6608;2011,50,11947.
2.W.Zhang,R.-G.Xiong,etal.,Phys.Rev.Lett.,2011,107,147601;2012,108,
3.W.Zhang,R.-G.Xiong,etal.,Adv.Mater.2011,23,5658.
4.H.-Y.Ye,R.-G.Xiongetal.,ActaCryst.Sect.B,2010,66,387.
5.H.-Y.Ye,R.-G.Xiongetal.,J.Appl.Cryst.2010,43,1031.
6.W.Zhang,R.-G.Xiong,etal.,Chem.Soc.Rev.2011,40,3577.
7W.Zhang,R.-G.Xiong,Chem.Rev.2012,112.1163.