The charge transfer of C2+ ions in collision with the OH radical has been studied theoretically by means of ab initio quantum chemistry molecular methods followed by a semiclassical dynamical treatment. In this first step, only the linear approach has been investigated, taking account of the influence of the variation of the distance r(OH) of the target during the process. The total and partial cross-sections have been determined, and an evaluation of the cross-sections on the different vibration levels has been performed. (C) 2008 Elsevier B.V. All rights reserved.