Synthesis and characterization of tin(IV) and organotin(IV) 1,4-dimethylpiperazine-2,5-dione (cyclosarcosylsarcosine) adducts

Abstract

The complexes [{SnCl₄(L)}_n]1, (SnBuCl₃(L)₂]2 and [{SnR₂Cl₂(L)}_n](R = Me 3 or Ph 4)[L = cyclosarcosylsarcosine (1,4-dimethylpiperazine-2,5-dione)] have been prepared and structurally characterized in the solid state by means of ¹¹⁹Sn Mössbauer spectroscopy, the determination of lattice dynamics by temperature-dependent ¹¹⁹Sn Mössbauer spectroscopy and by vibrational studies. The structure of complex 4 has been determined by X-ray crystallography and consists of infinite zigzag polymeric chains of trans-diphenyltin(IV) bridged by ketonic oxygen atoms. Each tin(IV) atom is surrounded by two carbons [Sn–C 2.129(7), 2.146(8)Å; C–Sn–C 160.1 (3)°], two chlorides [Sn–Cl 2.450(2)Å, Cl–Sn–Cl 98.5(1)°] and two oxygen atoms [Sn–O 2.370(6), 2.468(6)Å; O–Sn–O 86.1(2)°]. Tin-119 Mössbauer and vibrational data are discussed in terms of the crystal structure and the proposed structures. From the variable-temperature Mössbauer effect, the Debye temperatures for 1–4 were determined to be 144, 102, 128 and 123 K respectively.