A simple and very rapid method for the calculation of electrostatic isopotential maps is proposed. The potential is composed of transferable bond fragments. According to chemical evidence, c-, lone-pair, and 7r-bond contributions are considered. The computational work is proportional to the first power of the number of bond orbitals; therefore very large systems, such as enzymes or DNA, can be handled also. Transferability of bond orbital characteristics such as polarity, s character, and orientation is discussed. Though the absolute value of the potential is overestimated, trends obtained with STO-SG calculations are reflected correctly.

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