With ACS Articles on Request, corresponding authors are emailed a link that provides for up to 50 free e-prints of the final published article during the first 12 months following online publication. The link can be posted on the author's website or sent via e-mail from the author to interested colleagues. The link provides access to both the full text HTML and PDF. Those users who already have subscription access privileges obtain seamless IP-based access, and their accesses do not count against the 50 free e-prints allowance. ACS Articles on Request allows an author's article to be accessed without restriction on the ACS Publications website 12 months after web publication.