THEORETICAL STUDY OF THE EFFECT OF WATER MOLECULE ADDITION ON THE CONFORMATION OF SUBSTITUTED DIBENZO-18-CROWN-6 ETHER IN ITS COMPLEXATION WITH Na+ CATION USING SEMI EMPIRICAL METHOD MNDO/d - Pranowo, Harno Dwi; Austrian-Indonesian Centre for Computational Chemistry, Universitas Gadjah Mada, Yogyakarta (Universitas Gadjah Mada, 2010)