Described are novel nicotine derivatives represented by general formulas (I) and (III), and salts thereof, and herbicide & pharmaceutical compositions containing the same as the active ingredient. The compound and salts thereof can control annual or perennial weed growing on the land where various crops such as rice plant, wheat, cotton and corn grow for a wide period ranging from the pre-emergence to growth in a remarkably small dose. The compounds and salts thereof can be useful as an anti-microbial and anti-fungal agents and also for the treatment of blood pressure, skeletal muscle, attention deficit disorder, mental disorders, schizophrenia, Alzheimer disease, Parkinson's disease and depression. Also described is the preparation of the nicotine derivatives having formula (I) and (III).