Determining atom-centered monopoles from molecular electrostatic potentials. The need for high sampling density in formamide conformational analysis Export

@article{breneman:90, abstract = {An improved method for computing potential-derived charges is described which is based upon the CHELP program available from QCPE.1 This approach (CHELPG) is shown to be considerably less dependent upon molecular orientation than the original CHELP program. In the second part of this work, the CHELPG point selection algorithm was used to analyze the changes in the potential-derived charges in formamide during rotation about the C\&bond;N bond. In order to achieve a level of rotational invariance less than 10\% of the magnitude of the electronic effects studied, an equally-spaced array of points 0.3 \r{A} apart was required. Points found to be greater than 2.8 \r{A} from any nucleus were eliminated, along with all points contained within the defined VDW distances from each of the atoms. The results are compared to those obtained by using CHELP. Even when large numbers of points (ca. 3000) were sampled using the CHELP selection routine, the results did not indicate a satisfactory level of rotatational invariance. On the basis of these results, the original CHELP program was found to be inadequate for analyzing internal rotations.}, address = {Yale University Department of Chemisty, New Haven, Connecticut 06511}, author = {Breneman, Curt M. and Wiberg, Kenneth B.}, citeulike-article-id = {3866482}, citeulike-linkout-0 = {http://dx.doi.org/10.1002/jcc.540110311}, citeulike-linkout-1 = {http://www3.interscience.wiley.com/cgi-bin/abstract/109584287/ABSTRACT}, doi = {10.1002/jcc.540110311}, journal = {Journal of Computational Chemistry}, keywords = {ab-initio, charges, quantum-mechanics}, number = {3}, pages = {361--373}, posted-at = {2009-01-09 01:54:39}, priority = {0}, title = {Determining atom-centered monopoles from molecular electrostatic potentials. The need for high sampling density in formamide conformational analysis}, url = {http://dx.doi.org/10.1002/jcc.540110311}, volume = {11}, year = {1990} }

TY - JOUR ID - breneman:90 L3 - citeulike-article-id:3866482 N2 - An improved method for computing potential-derived charges is described which is based upon the CHELP program available from QCPE.1 This approach (CHELPG) is shown to be considerably less dependent upon molecular orientation than the original CHELP program. In the second part of this work, the CHELPG point selection algorithm was used to analyze the changes in the potential-derived charges in formamide during rotation about the C&bond;N bond. In order to achieve a level of rotational invariance less than 10% of the magnitude of the electronic effects studied, an equally-spaced array of points 0.3 Å apart was required. Points found to be greater than 2.8 Å from any nucleus were eliminated, along with all points contained within the defined VDW distances from each of the atoms. The results are compared to those obtained by using CHELP. Even when large numbers of points (ca. 3000) were sampled using the CHELP selection routine, the results did not indicate a satisfactory level of rotatational invariance. On the basis of these results, the original CHELP program was found to be inadequate for analyzing internal rotations. IS - 3 JF - Journal of Computational Chemistry AD - Yale University Department of Chemisty, New Haven, Connecticut 06511 EP - 373 TI - Determining atom-centered monopoles from molecular electrostatic potentials. The need for high sampling density in formamide conformational analysis VL - 11 SP - 361 KW - ab-initio KW - charges KW - quantum-mechanics AU - Breneman, Curt AU - Wiberg, Kenneth PY - 1990/// UR - http://dx.doi.org/10.1002/jcc.540110311 ER -