“…Thiosemicarbazone chemistry of copper(I) has received attention only recently [11Ϫ13], unlike copper(II) which has been intensively investigated [1Ϫ4]. For R 1 ϭ pyridyl, R 2 ϭ H, and R 1 ϭ R 2 ϭ Ph, only tetrahedral monomers [CuX(Htsc)(PPh 3 ) 2 ] (X ϭ Cl, Br, I), for R 1 ϭ Ph, R 2 ϭ H,both monomers (X ϭ I) and dimers (X ϭ Br, Cl), and for R 1 ϭ furan, thiophene and pyrrole, R 2 ϭ H, both halogen bridged [Cu 2 (µ-I) 2 (η 1 -S-Htsc) 2 (PPh 3 ) 2 ] and sulfur bridged dimers [Cu 2 (µ-S-Htsc) 2 X 2 (PPh 3 ) 2 ] (X ϭ Br, Cl) have been isolated [12,13].Further, acetone thiosemicarbazone (R 1 ϭ R 2 ϭ Me) with copper(I) chloride has formed a tetramer [Cu 4 (Htsc) 4 Cl 4 ], and a monomer [Cu(Htsc) 2 ]Cl [11], along with its complexes with other metals [14].…”