Thiosemicarbazonates of silver(I): Synthesis, spectroscopy and reactivity towards triphenylphosphine

Abstract

The new tripodal ligand tris-[{2-benzaldehyde}-oxoethyl)amine}-thiosemicarbazone,&nbsp; N[CH₂-CH₂-O-{<i>o</i>-C₆H₄- CH=N-NH-C(=S)-NH₂}]₃ (abbreviated as H₃L) on reaction with

silver(I) acetate in 3:1 (M:L) mol ratio in ethanol forms {Ag₅L(OAc)₂} (<b>1</b>), which in presence of excess triphenylphosphine (PPh₃) in chloroform-ethanol mixture yield, {Ag₅L(OAc)₂(PPh₃)₁₂](<b>2</b>) (L is deprotonated). Similarly, reactions of silver(I) acetate with salicylaldehyde thiosemicarbazone (H₂stsc), furan-2-carbaldehyde thiosemicarbazone

(Hftsc) and pyrrole-2-carbaldehyde thiosemicarbazone (Hptsc) in presence of PPh₃ in ethanol-chloroform form [AgL(PPh₃)_n] complexes (<b>3-5</b>)[L (n) = Hstsc (<b>3</b>); ftsc (<b>4</b>); ptsc (<b>5</b>);

thiosemicarbazones are monodeprotonated]. The complexes (<b>1-5</b>) have been characterised by their physical properties, analytical data, IR and UV spectroscopic studies.