ModelsforBondinginChemistry

Areadablelittlebookassistingthestudentinunderstanding,inanonmathematicalway,theessentialsofthedifferentbondsoccurringinchemistry.Startingwithashort,self–contained,introduction,Chapter1presentstheessentialelementsofthevariationapproachtoeithertotalorsecond–ordermolecularenergies,thesystemofatomicunits(au)necessarytosimplifyallmathematicalexpressions,andanintroductorydescriptionoftheelectrondistributioninmolecules.Usingmostly2x2Hückelsecularequations,Chapter2,byfarthelargestpartofthebookbecauseofthemanyimplicationsofthechemicalbond,introducesamodelofbondinginhomonuclearandheteronucleardiatomics,multipleanddelocalizedbondsinhydrocarbons,andthestereochemistryofchemicalbondsinpolyatomicmolecules,inaword,amodelofthestrongfirst–orderinteractionsoriginatingthechemicalbond.InChapter3theHückelmodelofthelinearpolyenechainisusedtoexplaintheoriginofbandstructureinthe1–dimensionalcrystal.Chapter4dealswithasimpletwo–statemodelofweakinteractions,introducingthereadertounderstandsecond–orderelectricpropertiesofmoleculesandVdWbondingbetweenclosedshells.Lastly,Chapter5studiesthestructureofH–bondeddimersandthenatureofthehydrogenbond,whichhasastrengthintermediatebetweenaVdWbondandaweakchemicalbond.BesidesaqualitativeMOapproachbasedonHOMO–LUMOchargetransferfromanelectrondonortoanelectronacceptormolecule,aquantitativeelectrostaticapproachispresentedyieldinganelectrostaticmodelworkingevenatitssimplestpictoriallevel.Alistofalphabeticallyorderedreferences,authorandsubjectindicescompletethebook.