Lab & Science- Guideview

Ozone Polarity Ozone Polarity Ozone (CAS 10028-15-6) is polar. O3 has a literature gas-phase dipole of about 0.53 D, which follows from its bent oxygen centre Snyder polarity index Not conventionally assigned; XlogP3-AA -1.12 (Crippen calculated, RDKit).
Boron trifluoride Polarity Boron trifluoride Polarity Boron trifluoride (CAS 7637-07-2) is nonpolar. BF3 is symmetric, so its bond dipoles cancel and μ = 0 D exactly Dipole moment 0 D (exact by symmetry); dielectric constant ≈1.00191 (gas estimate). Covers geometry, comparison data, QC strategy and B2B.
Sulfur trioxide Polarity Sulfur trioxide Polarity Sulfur trioxide (CAS 7446-11-9) is nonpolar. SO3 is symmetric, so its bond dipoles cancel and μ = 0 D exactly Dipole moment 0 D (exact by symmetry); dielectric constant ≈1.06662 (gas estimate). Covers geometry, comparison data, QC strategy and B2B.
Oxygen Polarity Oxygen Polarity Oxygen (CAS 7782-44-7) is nonpolar. Two identical nuclei leave the O=O bond with no dipole at all, so mu = 0 D by symmetry; paramagnetism is magnetic, not electrostatic. Snyder polarity index Not conventionally assigned; XlogP3-AA -1.1.
Nitrogen Dioxide Polarity Nitrogen Dioxide Polarity Nitrogen Dioxide (CAS 10102-44-0) is polar. An odd electron bends NO2 to 134deg (0.316 D), but it dimerises to centrosymmetric N2O4 at 0 D, so the verdict is temperature dependent. Snyder polarity index Not conventionally assigned; XlogP3-AA -0.3.
Nitrogen Polarity Nitrogen Polarity Nitrogen (CAS 7727-37-9) is nonpolar. Identical nuclei give the N=N bond no dipole at all, so mu = 0 D by symmetry. Dipole moment 0 D; dielectric constant ≈1.00055 (gas); ≈1.45–1.47 (liquid, −196 °C).
Ammonia Polarity Ammonia Polarity Ammonia (CAS 7664-41-7) is polar. One lone pair makes ammonia pyramidal at 107.8deg, leaving a 1.471 D uncancelled dipole. Dipole moment 1.471 D; dielectric constant ≈1.006 (gas); ≈16.9 (liquid, 25 °C).
Hydrogen Cyanide Polarity Hydrogen Cyanide Polarity Hydrogen Cyanide (CAS 74-90-8) is strongly polar. Linear H-C=N with distinct ends leaves the large C=N dipole uncancelled. Dipole moment ~ 2.99 D; dielectric constant ≈114.9 (liquid, 20 °C). Covers geometry, comparison data, QC strategy and B2B.
Carbon Monoxide Polarity Carbon Monoxide Polarity Carbon Monoxide (CAS 630-08-0) is formally polar but effectively nonpolar. Heteronuclear diatomic with a 0.110 D dipole whose negative end lies on carbon. Dipole moment 0.110 D; dielectric constant ≈1.00065 (gas).
Methane Polarity Methane Polarity Methane (CAS 74-82-8) is nonpolar. Four identical C-H bonds cancel by Td tetrahedral symmetry. Dipole moment 0 D; dielectric constant ≈1.0008 (gas). Snyder polarity index Not conventionally assigned; XlogP3-AA 0.6.

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