Synthesis and spectroscopic characterization of new $[Cu(^{tBu} salpphen)]_2,[MoCl_2(salpphen)]_2$ complexex and $Sn_2Cl_8(^{tBu}salpphen).2HNEt_3$ adduct

Tetradentate Schiff base ligands, which were derived from the condensation of phenylenediamine with salicylaldehyde [salpphenH2: N,N'-p-phenylene-bis(salicyclideneimine)] or 3,5-di-tert-butyl-2-hydroxybenzaldehyde $[^{tBu} salpphenH_2$: N,N'-p-phenylene-bis(3,5-di-tert-butylsalicylidene)] and their complexes of Cu(II), Mo(IV) and adduct of Sn(IV) were synthesized and characterized by $^1H-NMR$, $^{13}C-NMR$, and IR spectroscopic methods, mp, elemental analysis, and magnetic susceptibility. According to these data probable structures were assigned to these complexes and adduct. These are of the formula $[Cu(^{tBu} salpphen)]_2$ and $[MoCl_2(salpphen)]_2$ , and $Sn_2Cl_8(^{tBu}salpphen).2HNEt_3$. [Cu(tBusalpphen)]2 was prepared by the reaction of the metal salt with the tJ5usalpphenH2 Schiff base ligand in EtOH. $[MoCl_2(salpphen)]_2$ was synthesized by reactions of $[MoCl_4(CH_3CN)_2]$ with the salpphen$H_2$ Schiff base ligand in THF. The Schiff base adduct $Sn_2Cl_8(^{tBu}salpphen).2HNEt_3$ was synthesized by the reaction of $SnCl_4$ with the $^{tBu}SalpphenH_2$ Schiff base ligand in the presence of $NEt_3$ in toluene.