求翻译化学类文献Designandsynthesis:6-Phenyl-2,2’-bipyridine(HC^N^N)and1,3-di(pyridin-2-yl)benzene(HN^C^N)representthebasicdesignsofcommonp-conjugatedtridentatecyclometalatingligandsforcyclometalatedPtIIsystems.However,th

　　求翻译化学类文献

　　Designandsynthesis:6-Phenyl-2,2’-bipyridine(HC^N^N)

　　and1,3-di(pyridin-2-yl)benzene(HN^C^N)representthe

　　basicdesignsofcommonp-conjugatedtridentatecyclometalating

　　ligandsforcyclometalatedPtIIsystems.However,

　　thesewell-establishedligandsystemsaredifficulttobefurther

　　modifiedorfunctionalised.Thepresenceofa1-pyrazolyl-

　　NHonthenewcyclometalatingligand,HL1,enablesits

　　easyfunctionalisationbynucleophilicsubstitution.[14]We

　　demonstratedthisbydirectalkylationofthe1-pyrazolyl-

　　NHsiteonHL1with1,5-dibromopentanetogenerateHL2

　　ingoodyield.Furthernucleophilicsubstitutionoftheterminal

　　alkylbromideonHL2byPPh3yieldedthetriphenylphosphonium-

　　functionalisedcyclometalatingligand,triphenyl{

　　5-[3-(6-phenylpyridin-2-yl)-1H-pyrazol-1-yl]pentyl}phosphonium

　　bromide(HL3)(Scheme1).Thechloridesaltof

　　HL3wasobtainedbysimplemetathesis.Thecorresponding

　　cyclometalatedPtII–chloridecomplex,[Pt(L3)Cl]+,wasobtained

　　ingoodyieldbydirectmetalationofHL3(chloride

　　salt)withK2PtCl4inglacialaceticacid.Allofthenewligands

　　andthecycloplatinatedcomplexreportedhavebeen

　　fullycharacterisedby1HNMRspectroscopyandmassspectrometry.

　　Linearphotophysicalstudies:Electronictransitionspectra

　　of[Pt(L3)Cl]+invarioussolventsareshowninFigure1A.

　　Spectroscopicpropertiesofthecomplexshowstrongresemblances

　　toitsrelated[Pt(L1)Cl]complex.TheUV-visible

　　regionisdominatedbyintenseabsorptionbandsataround

　　275–375nmwithextinctioncoefficients(e)intheorderof

　　104dm3mol21cm21andalessintensebandataround380–

　　410nmwitheintheorderof103dm3mol21cm21.Withreference

　　topreviousspectroscopicstudiesoftheanalogous[Pt-

　　ACHTUNGTRENUNG(C^N^N)Cl]and[Pt(L1)Cl]complexes,absorptionbandsat

　　275–375nmareattributedtointraligand(p(L)!p*(L))

　　transitions,whereasthelowerene