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Electron donor-acceptor molecular charge transfer complexes (CTCs) formed by -sexithiophene (6T) and tetrafluoro-tetracyano-quinodimethane () on a Au(111) surface are investigated by scanning tunneling microscopy, spectroscopy, and spectroscopic imaging at 6 K. New hybrid molecular orbitals are formed in the CTCs, and the highest occupied molecular orbital of the CTC is mainly located on the electron accepting while the lowest unoccupied molecular orbital is predominantly positioned on the electron donating 6T. We observed the conductance switching of inside CTCs, which may find potential applications in novel molecular device operations.