The complexation of Cd+' by acetic and isonicotinic hydrazides and diacetyl hydrazine has been studied polarographically. Diacetyl hydrazine did not form a detectable complex, while the other hydrazides each formed at least three consecutive, soluble complexes. The stability constants of the various complexes were calculated from the data. The Cdf2-hydrazide complexes appeared to involve the neutral hydrazide molecule as the complexing species. This behavior is distinctly different from the previous reports of some metal-isonicotinic hydrazide systems which have shown that the anionic form is involved.ARBOKPLIC ACID hydrazides have C a \vide variety of applications varying from biological-ljhariiiaceutical activity to heavy cheniical uses and, therefore, the importance of this group of compounds has grown. During an analytical study to develop a universal method for carbosylic acid hydrazides (8), complexation of metal ions by hydrazides appeared likely. Since the formation of metal hydrazide complexes would be important in many of the applications for the materials, a study of some hydrazide complexes was undertaken.The only literature references to hydrazide complexes which could be found were the work of ;Ilbert' ( I ) , and of Fallab and Erlenmeyer (3) on the coniplexes of isonicotinic acid hydrazide. -4lbert used a potentiometric method to determine t,he stability constant? for Co+?, Cu+2, Xi+2, and Zn+* complexes.In each case, a 1 : l coniples was found with the log of the stability constants as follows: Cot2, 4.8; Cu+*, 8.0; Sit2, 5.5; Zn+2, 5.4. Fallab and Erlenmeyer determined the copper conii)les stabilit'y constant sl)ectrol)hotometrically, using Job's method of continuow variations; a 2: 1 comples was found with a constant a t 1.7 X lo5.The use of polarographic data for the study of complexation is well known (6). ; I siiiilile plot of the shift in EllP 2)s. log ligand concentration suffices for strong, single complexes, while more elaborate calculations are necessary for multiple coniplese..j. DeFord and Huiiie ( 2 ) first derived equations for the calculation of succesqive stability constants from polarokraphic values.Subsequently, a number of workers have utilized the technique and have modified some of the details to obtain more precise results: in particular, Irving (5) has reviewed the approach vel y thoroughly.The polarographic technique seemed to produce excellent iesults and, therefore, a polarographic investigation of the possible complexation of cadiilium by some simple hydrazides was undertaken. EXPERIMENTALChemicals. =111 inorganic chemicals were reagent grade and were used without further purification..icetic hydiazide (Olin Xathieson Chemical Corp.) r\ ab redistilled under vacuum and stored under dry nitrogen. Diacetylhydrazine (I) (Olin Xathie-on Chemical Corp.), [CH3CSHSHCCH3] (1) was recrystallized ta ice from water, dried a t 100" C., and also itored under dry nitrogen. Isonicotinic hydrazide (Eaqtnian Khite Label) was u.ed without further 1)urification.Gelatin (Fizher Scientific ...

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