Prof. Peter Stang Department of Chemistry University of Utah 315 South 1400 East, RM 2020 Salt Lake City UT 84112-0850 Dear Professor Stang, I am hereby submitting the manuscript of the article "A Comprehensive SelfConsistent Spectrophotometric Acidity Scale of Neutral Brønsted Acids in Acetonitrile" by Agnes Kütt, Ivo Leito, Ivari Kaljurand, Lilli Sooväli, Vladislav M. Vlasov, Lev M. Yagupolskii and Ilmar A. Koppel for your consideration for publishing in the Journal of the American Chemical Society. In this work a comprehensive self-consistent spectrophotometric acidity scale containing 93 neutral Brønsted acids in acetonitrile spanning 24 orders of magnitude of acidities is reported and herewith the whole domain of conventional acidities in acetonitrile is covered. The scale includes representatives from all the conventional families of OH acids, NH acids and CH acids. The scale creates a reliable and consistent basis for further acid-base studies in acetonitrile. All authors have seen and approved the submission of the manuscript. There is no related work submitted or in press. The manuscript has been submitted exclusively to JACS. We prefer web galley proofs. Please consider Prof. Louis S. Hegedus as the editor handling the manuscript. Please consider the following potential reviewers: 1. Professor José-Luis M. Abboud (Instituto “Rocasolano”, Madrid, e-mail: jlabboud@iqfr.csic.es, Tel.: 34-91-561 9400 ext 1000; fax: 34-91-564 2431). 2. Professor Zvonimir Maksić (Quantum Organic Chemistry Group, Division of Organic Chemistry and Biochemistry, RuderBoskovic Institute, PO Box 180, 10002 Zagreb, Croatia, Tel.: +3851 4561117; fax: +385 1 4561118; e-mail: zmaksic@spider.irb.hr). 3. Professor François Terrier (Laboratoire SIRCOB, UMR 8086, Institut LaVoisier-Franklin, Université de Versailles, 45, Avenue des Etats-Unis, 78035 Versailles Cedex, France, Tel.: +33-1-39-25-44-50; fax: +33-1-39-2544-52; e-mail:terrier@chimie.uvsq.fr). 4. Prof. Robert H. Morris (Department of Chemistry, University of Toronto, 80 St George St., Toronto, Ont. M5S 3H6, Canada; e-mail: rmorris@chem.utoronto.ca). 5. Professor Claude F. Bernasconi (University of California, Santa Cruz, Tel.: 831-459-2035, fax: 831- 459-2935; e-mail: bernasconi@chemistry.ucsc.edu). 6. Professor Masaaki Mishima (Institute for Materials Chemistry and Engineering, University of Kyushu, Hakozaki, Higashi-ku, Fukuoka-shi 8128581, Fukuoka, Japan, Tel.: +81-92-642-2727; Fax: +81-92-642-2715; e-mail: mishima@ms.ifoc.kyushu-u.ac.jp). Sincerely yours Ivo Leito Professor University of Tartu Faculty of Physics and Chemistry Institute of Chemical Physics Jakobi 2 street, 51014 Tartu ESTONIA phone: +372-7-375-259 fax: +372-7-375-264 e-mail: ivo.leito@ut.ee