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What is the dipole moment of borazine? I tried googling it but can't find a reliable source. I searched in JD Lee too. It might have it but I could not find.

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This NIST publication lists the dipole moment as zero, while drugfuture.com (I've never heard of this site) reports a value of 0.50 as measured in benzene at $\pu{25^oC}$.

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The simplest, but not complete, way to tell if the dipole is zero or not is look for a centre of inversion, which borazine would have if it were flat like benzene.

To be absolutely certain the molecule's point group has to be found. To have a dipole the molecule must belong to $C_1, C_{nv}, (n>1) $ and $C_s$ point groups.

As borazine is not planar (according to wikipedia page) and seems to belong to $C_{3v}$ so it should have a dipole. However, looking at the structure the dipole has to be small due to the way the atoms are arranges around the 3 fold axis and the small displacement of the plane containing the B to that of the N atoms. If you can find B-N, N-H, B-H bond dipole values you could calculate the dipole, at least get an approximate value.

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    $\begingroup$ If I remember correct, borazine is planar $D_\mathrm{3h}$? $\endgroup$ – orthocresol Apr 16 '17 at 8:32
  • $\begingroup$ @orthocresol yes $D_{3h} $if planar and so no dipole. $\endgroup$ – porphyrin Apr 16 '17 at 8:49

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