Synthesis & Characterisation of Ni (Ii) Chelates of Diethylmesoxalate Phenylhydrazone and Their Electron Releasing As Well As Electron Withdrawing Substituent in Ammoniacal Medium: Synthesis and Characterization of Ni (II) Complexes With Electron-Releasing and Electron-Withdrawing Substituents. JASRAE 2013, 5 (10), 0-0.