Our Products:
Asemblon provides the highest purity (> 99%) of alkanethiols and dialkyl disulfides available in the industry.  The high purity of compounds assures successful experiments and reproducible results every time.

Our catalog offers a great variety of head groups and various chain lengths for different applications.

Thiols vs. Disulfides
It has been well established that monolayers assembled from dialkyl disulfides are indistinguishable from monlayers assembled from their alkanethiol analogs (C.D. Bain, et al. J. Am. Chem. Soc. 1989, 111, 321-335; H. A. Biebuyck, et al. Langmuir, 1994, 10, 1825-1831).  The only difference is the speed or kinetics of the monolayer formation, however after 24 hours or typically shorter times the monolayers are virtually the identical.  Dialkyl disulfide compounds are typically more stable upon exposure to oxygen and are therefore more fogiving when handling and storing in less than optimal conditions. 

When preparing mixed monolayers it is recommended that both compounds have the sulfur moiety in the same oxidation state, either both as thiols or both as disulfides, in order to have similar kinetics.