OBSERVATION OF MOLECULAR LAYERS IN 1,3-DITHIOL-2-YLIDENE)-1,3,4,6-TETRATHIAPENTALENE) (TMET-TTP) SINGLE-CRYSTALS BY MEANS OF SCANNING-TUNNELING-MICROSCOPY

Scanning tunneling microscope (STM) observation has been made on singl e crystals of (TMET-TTP)(x)A (TMET-TTP: ,3-dithiol-2-ylidene)-1,3,4,6- tetrathiapentalene). where A is PF6, ReO4:, AuI2 or ClO4. The STM imag es with molecular resolution were observed is the conducting bc-plane, and were in accord with tile results of X-ray observation. The S atom s in the thiomethyl groups are concluded to be responsible for the bri ght spots. The structural distortion in thr ClO4 salt as indicated by X-ray analysis was observed as domain structures of about 100 nmx100 n m area, through direct observation of different molecular alignments d ue to different space groups could not be made.