Coordination compounds of hydrazine derivatives with transition metals—XI Reaction of heterocyclic bases with nickel(II) chelates of hydrazine-s-methyldithiocarboxylate schiff bases

Iskander, Magdi F.; Dessouky, M.A. El; Sallam, S. A.

doi:10.1016/0022-1902(76)80195-9

Cited by 13 publications

(3 citation statements)

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“…The complexes 3a-4f underwent either nucelophilic attack on the Ni atom or nucleophilic substitution of the SCH 3 group or both [3,17,29]. At low concentration of amine and because the first formed monosubstituted product deactivated the other C SCH 3 group, the momosubstituted chelates 4a-4f were isolated.…”

Section: Synthesis Of Monosubstituation Nickel(ii) Complexes 4a-4fmentioning

confidence: 98%

“…[3,16,17]. The series of Zn(II), Cd(II), Ni(II), Cu(II), and Pd(II) complexes of these hydrazones was obtained from the reaction of monohydrazones and bishydrazones with the corresponding metal(II) acetate or chloride [3,17]. Nickel(II) was found to form many complexes with octahedral, square planar, and tetrahedral geometries, as well as a number of five-coordinate compounds [18].…”

Section: Introductionmentioning

confidence: 99%

“…The reactions of some α-diketones and α-keto aldehydes with methyl dithiocarbazoate to give the corresponding mono-and bishydrazones were also reported. [3,16,17]. The series of Zn(II), Cd(II), Ni(II), Cu(II), and Pd(II) complexes of these hydrazones was obtained from the reaction of monohydrazones and bishydrazones with the corresponding metal(II) acetate or chloride [3,17].…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of the reaction of arylethanediylidene‐bis‐dithiocarbazonoate Ni complexes with morpholine in benzene: Substituent and temperature effects

Shehata

Fathalla

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et al. 2011

Int J of Chemical Kinetics

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[1-Arylethanediylidene-bis(methyl dithiocarbazonoate) NN SS (−2)]Ni(II) complexes were prepared by condensation of arylglyoxals with methyl dithiocarbazoate to give the corresponding hydrazonoates. The chelation of nickel(II) with these hydrazonoates gave square planar Ni complexes. The k 3 values for the substitution of SCH 3 close to the aryl group with morpholine (Mo) in benzene were found to increase steadily (20-35 • C) followed by a sudden drop after 35 • C. A continuous decrease in k 3 values was observed by further elevation in the temperature. The Arrhenius plot showed a convex curve at the whole temperatures 20-55 • C, and negative H # values for the reactions were obtained at 40-55 • C. The Hammett plots at the temperature ranges 20-35 • and 40-55 • C exhibited good straight lines with ρ values of 1.44-0.73 and 1.18-1.25, respectively. The proposed mechanism is a nucleophilic aromatic substitution-like, in which the rate-determining step is the proton transfer process in the temperature range 20-35 • C whereas the mechanism in the range 40-55 • C passes through the attack of Mo on the carbon carrying the SCH 3 group followed by the addition of the second Mo molecule on Ni to form an intermediate, which undergoes elimination of Mo and CH 3 SH to give a monosubstitution complex.

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Section: Synthesis Of Monosubstituation Nickel(ii) Complexes 4a-4fmentioning

confidence: 98%