Abstract
The parachors of a group of organotins were measured and compared with calculated values using both atomic constants and bond constants to obtain corresponding values for tin. The variation was found to be lower for the first method. The parachors were found to be about 8 times the molar refractions and could be approximately predicted from calculated molar refractions.The refrachors of the organotins were calculated and a suitable series of additive constants devised to approximate the found values. Excellent correlation was obtained between the order of refrachors corrected for molecular weight and the order of dispersions as expressed by the Nu (ν) values. An initial indication of alternation in methylene group increments for both molar refraction and Nu values was found. For a constant dispersion ratio (Q value) the refractive indices for the F and C lines of hydrogen were calculated.
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