Crystal structure of chloride and iodide complexes of lead(II) with 2-dimethylaminoethanol obtained by direct synthesis

Abstract

The compounds {Pb 5Cl 6[(CH 3) 2NCH 2CH 2O] 4} and {Pb 3[(CH 3) 2NCH 2CH 2] 3I}I 2, where (CH 3) 2NCH 2CH 2O is deprotonated 2-dimethylaminoethanol, have been synthesized using the direct method of interaction and characterized by X-ray crystallography. The 2-dimethylaminoethoxo groups have the gauche conformation and are coordinated via oxygen and nitrogen atoms. The chloride complex contains five- and eight-coordinate lead(II) atoms linked by μ 3-bridging oxygen and μ 2-bridging chlorine atoms, whilst in the iodide complex three- and four-coordinate metal atoms are linked by μ 3- and μ 2-bridging oxygen atoms. The structural differences between the coordination environments of the lead atoms are discussed in connection with the emergence of the “inert pair” effect. The compound {Pb 5Cl 6[(CH 3) 2NCH 2CH 2O] 4} possesses molecular structure whilst {Pb 3[(CH 3) 2NCH 2CH 2O] 3I}I 2 has an ionic-type crystal lattice.