Estimate interactions from charges, distance, and dielectric conditions. Adjust for solvent, ions, temperature, and orientation. Generate normalized scores for chemistry screening and comparison workflows.
| Scenario | q1 | q2 | Distance (Å) | Dielectric | Ionic Strength | Adjusted Energy (kJ/mol) | Score | Class |
|---|---|---|---|---|---|---|---|---|
| Salt Bridge Pair | 1.00 | -1.00 | 3.20 | 12.0 | 0.050 | -17.7057 | 95.03 | Strong Attraction |
| Aqueous Ion Pair | 1.00 | -1.00 | 5.00 | 78.5 | 0.150 | -0.9774 | 54.06 | Moderate Attraction |
| Repulsive Cation Pair | 1.00 | 1.00 | 4.50 | 30.0 | 0.100 | 3.2166 | 36.91 | Moderate Repulsion |
| Weak Polar Contact | 0.35 | -0.45 | 6.50 | 40.0 | 0.200 | -0.0888 | 50.37 | Weak / Near Neutral |
These rows use the same formula and normalization settings as the live calculator for consistent benchmarking.
The calculator combines Coulombic interaction energy with solution screening, thermal scaling, hydration shielding, and orientation effects. Results are reported as energy and normalized scores.
This calculator converts electrostatic interactions into a normalized screening score for chemistry teams. It supports formulation design, ionic pairing checks, residue contact reviews, and solvent comparison work during early-stage screening. The output includes adjusted energy in kJ/mol, plus favorability and magnitude indices from 0 to 100. Because each run exports the same fields, analysts can compare batches consistently, archive assumptions, and share results across experiments, reports, technical meetings, and documentation workflows.
Charge magnitude and separation distance produce the largest score shifts in most scenarios. Doubling one effective charge roughly doubles raw Coulomb energy before screening adjustments for charged fragments. Increasing distance from 3 Å to 6 Å can sharply reduce interaction strength because the model divides by distance raised to the selected exponent. When the exponent is 1.0, decay is moderate; at 2.0 or 3.0, short-range contacts dominate while long-range influence drops much faster experimentally.
Dielectric constant and ionic strength define how strongly the environment screens charges. Lower dielectric media, including hydrophobic pockets or organic-rich phases, usually preserve stronger electrostatic effects than water-like systems. Ionic strength activates Debye screening through an exponential factor. For instance, increasing salt from 0.01 M to 0.20 M typically shortens Debye length and weakens longer-range contributions. These settings are critical when comparing buffers, gradients, charge stabilization strategies, and solvent blends reliably today.
Temperature, orientation, hydration shielding, and polarizability refine the estimate beyond basic Coulomb behavior. The temperature factor normalizes interactions relative to 298.15 K, which helps standardize comparisons across runs. Orientation represents geometric alignment and can reduce or invert effective behavior when atom groups are unfavorable. Hydration shielding lowers direct charge exposure, while polarizability increases local response. Together, these controls support sensitivity testing under conservative and optimistic assumptions for planning internally.
For benchmarking, keep the score scale fixed and document all assumptions before comparing results. Start with the example table, then replace values with project-specific charges, distances, and media settings. Favorability scores near 50 indicate near-neutral behavior, while values near 100 indicate strong attraction and values near 0 indicate strong repulsion. Exported CSV and PDF outputs preserve reproducible metrics for notebooks, QA records, client summaries, internal decision meetings, and formal audit workflows and audits.
The favorability score converts adjusted electrostatic energy into a 0–100 scale. Higher values indicate stronger attraction, values near 50 are near-neutral, and lower values indicate stronger repulsion.
Yes. The calculator accepts effective partial charges, which is useful for molecular fragments, functional groups, and force-field based estimates.
Higher ionic strength shortens the Debye length, increasing screening. That reduces long-range electrostatic influence and usually lowers the adjusted interaction magnitude.
Use one fixed score scale for a comparison set. Smaller values increase score sensitivity, while larger values compress differences across scenarios.
No. It is a fast screening and reporting tool based on simplified electrostatic assumptions, not a full electronic structure calculation.
Keep dielectric, score scale, and advanced factors consistent, then compare adjusted energy, magnitude index, and favorability score across the same conditions.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.