TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The catalyst is zinc oxide, zinc chloride, magnesium chloride, nickel chloride, cobalt chloride, phosphoric acid, anhydrous aluminum chloride, phosphorus oxychloride or cobalt chloride. The acid-binding agent is molecular sieve, titanium tetrachloride, aluminum trichloride, aluminum oxide, methyl benzene sulfonic acid, glacial acetic acid or anhydrous magnesium sulfate.R7=1-3C alkyl, H or phenyl;andR8=alkyl moiety of formula (-(CH2)-(CH2)-), benzyl moiety of formula (-(C6H6)-), diphenyl moiety of formula (-(C6H6)-(C6H6)-), diphenyl moiety of formula (-(C6H6)-(C(H2))-(C6H6)-) or sulfur substituted moiety of formula (-(C6H6)-(S(=O)(=O))-(C6H6)-).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparation of the single acyl ferrocene Schiff base iron amino ring phosphorus nitrile compound (I) involves adding phosphorus pentachloride with ammonium chloride to obtain hexachlorocyclotriphosphazene, adding two ferrocene and acylating agent to obtain monoacyl dicyclopentadienyl iron. Acyl ferrocene is reacted with diamine compound containing amino of the ferrocene Schiff base and reacted with hexachlorocyclotriphosphazene with ferrocene Schiff base of amino for generating acyl ferrocene Schiff base group ring phosphorus trifluoride nitrile compound (I). Preferred Components: The compound (I) preparation method further involves utilizing catalyst, acylating agent, inert solvent and acid-binding agent. The acylating agent is anhydride, acyl chloride or N, N-dimethyl formamide. The inert solvent is chosen from chlorobenzene, tetrachloroethane, carbon tetrachloride, tetrachloroethylene, o-dichlorobenzene and 2-toluene chloride. The acid-binding agent is pyridine or triethylamine. The diamine is amino substituted compound of formula ((NH2)-(R7)-(NH2)) or hydrocarbon compound of formula (-R8-).Preferred Composition: The ferrocene is added with the acylating reagent in a mol ratio of 1: (1 to 5) . The acyl ferrocene is added with diamine in a mol ratio of 1: (1-1.5).Preferred Process: The acyl ferrocene is added with diamine in the inert solvent under an effect of ferrocene Schiff base of the amino in a presence of the catalyst at 40-150 degrees C for 6-24 hours.