1 Silver(I)-mediated Hoogsteen-type base pairs Dominik A. Megger, a Célia Fonseca Guerra, b F. Matthias Bickelhaupt,* b and Jens Müller* a a) University of Muenster, Institute for Inorganic and Analytical Chemistry, Corrensstr. 28/30, 48149 Muenster, Germany b) Department of Theoretical Chemistry and Amsterdam Center for Multiscale Modeling (ACMM), Scheikundig Laboratorium der Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands. mueller.j@uni-muenster.de, phone: +49 251 833 6006, fax: +49 251 833 6007 f.m.bickelhaupt@vu.nl, phone: +31 20 59 87617, fax: +31 20 59 87629 SUPPLEMENTARY INFORMATION