M-45 (Mancozeb 75% Wp)

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NOMENCLATURE
Common name mancozeb (BSI, E-ISO); mancozA"be ((m) F-ISO); manzeb (JMAF)
IUPAC name manganese ethylenebis(dithiocarbamate) (polymeric) complex with zinc salt
Chemical Abstracts name [[1,2-ethanediylbis[carbamodithioato]](2-)]manganese mixture with [[1,2-ethanediylbis[carbamodithioato]](2-)]zinc
CAS RN [8018-01-7] (formerly [8065-67-6]); [8018-01-7] is also applied to other mixed manganese and zinc ethylenebis(dithiocarbamate) complexes

Physical Chemistry:-
Composition The ISO definition is 'a complex of zinc and maneb containing 20% of manganese and 2.55% of zinc, the salt present being stated (for instance mancozeb chloride)'. Form Greyish-yellow powder. M.p. Decomposes at 192-204 A C V.p. Negligible at 20 A C S.g./density 1.92 Solubility In water 6.2 ppm (pH 7.5, 25 A C). Insoluble in most organic solvents; dissolves in solutions of powerful chelating agents but cannot be recovered from them. Stability Stable under normal, dry storage conditions. Slowly decomposed by heat and moisture. On hydrolysis (25 A C), DT50 20 d (pH 5), 17 h (pH 7), 34 h (pH 9). Mancozeb a.i. is unstable and the tech. not isolated; the formulated product is produced in continuous process. F.p. 137.8 A C (Tag open cup)

Applications : Biochemistry Non-specific thiol reactant, inhibiting respiration. Mode of action Fungicide with protective action.