In pursuit of the objective of the series which is to present considered reviews of areas concerned with quantitative study of organic compounds and their behaviourNphysical organic chemistry in its broadest senseNina manner accessible to a general readership, this twenty-ninth volume contains five contributions on a diversity of topics. Two of these reflect the increasing importance of physical organic studies in providing fundamental knowledge relevant to the development of new materials with novel physical properties. The others represent more traditional areas of physical organic interest, where recent research has thrown new light. Read more... Abstract: In pursuit of the objective of the series which is to present considered reviews of areas concerned with quantitative study of organic compounds and their behaviourNphysical organic chemistry in its broadest senseNina manner accessible to a general readership, this twenty-ninth volume contains five contributions on a diversity of topics. Two of these reflect the increasing importance of physical organic studies in providing fundamental knowledge relevant to the development of new materials with novel physical properties. The others represent more traditional areas of physical organic interest, where recent research has thrown new light