Effective electron-electron interaction in organic chain molecules

Effective electron-electron interactions are investigated in chain molecules with substituents. The system under consideration is divided into two parts: the main chain called the spine and the substituents which are side chains in our case. In estimating the effective electron-electron interaction in the spine, the polarization effects arising from the spine and the side chains are both taken into account. The resultant formula, thus, is rather general, so that the current treatments are reproduced as special ones. A few examples are treated numerically. Results indicate that Little's idea, namely the room temperature organic superconductor is unlikely from the viewpoint of the effective interaction.