Intramolecular Charge Transfer. Intramolecular charge transfer ict is the charge transfer process between electron acceptor a and donor d within organic pushpull π conjugated molecules. Twisted intramolecular charge transfer tict is an electron transfer process that occurs upon photoexcitation in molecules that usually consist of a donor and acceptor part linked by a single bond.
This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. A charge transfer complex or electron donor acceptor complex is an association of two or more molecules in which a fraction of electronic charge is transferred between the molecular entities. Emission or both absorptionemission solvatochromic effects induced by intramolecular charge transfer ict have been used to determine the excited state dipole moments of the locally excited μ e le and the polar solvent induced μ e ict states and the first hyperpolarizability parameter β ct of six asymmetric distyrylbenzene analogues two 910.
Herein we designed two triphenylamine pyrazine compounds namely 25 tpa2p and 26 tpa2p with planarized intramolecular charge transfer character to overcome this problem.
The intramolecular charge transfer ict process in donoracceptor systems has tremendous importance in various physical and biological systems. Organicmoleculesin excitedelectronicstates is chargetransfer. Intramolecular charge transfer ict is an important factor in the nonlinear optical nlo properties of organic molecules. In order to study the effect of ict on two photon absorption tpa and excited state absorption esa three chalcone derivatives 1 2 and 3 with different electron pushpull systems were designed and synthesizedthe ict performance of these.