One difference is that DMSO-d6 is going to cost more.

Chemically speaking, the diffference is that the hydrogens in the -d6 variety have been replaced by deuterium.

Many test compounds (drugs, inhibitors, etc) are not soluble in water and therefore dimethylsulfoxide (DMSO) is used as a solvent instead. The compound dissolved in DMSO is what is used to treat the cell or animal and therefore you must prove that it is the compound, not the DMSO which is causing any results seen. To ensure this, you have a control that contains only DMSO and not the test compound. This is often referred to as a "vehicle control".

DMSO (dimetylsulf oxide) (CH3)SO is a liquid with the freezing point at 19 oC.

It is used as a cryo-protectant. DMSO prevents the formation of ice crystals and prevents cell lysis during thawing.

Use the link below to begin your investigation of the geometry of Ph3SnCl and the polar aprotic solvent DMSO (dimethyl sulfoxide).