As part of the ACS Articles on Request e-prints service, ACS authors may choose to e-mail or post this link on their website to distribute up to 50 free e-prints of their final published article to interested colleagues during the first 12 months of publication. After that 12 month period any author's article may be accessed without restriction via the same author-directed link that appears above. The link directs readers to the Full Text version of the article on the ACS Publications website.