Cadmium(II) and zinc(II) complexes based on 2-morpholine-pyridine-4-carboxylic acid: syntheses and structures

Abstract The complexes [Cd(mpca·H)Cl 2 ] · H 2 O ( 1 ) and [Zn(mpca·H)Cl 2 ] ( 2 ) have been synthesized and characterized by single-crystal and IR spectroscopya (mpcaH = 2-morpholine-pyridine-4-carboxylic acid). Both complexes crystallize in the triclinic space group P <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <m:mrow> <m:mover accent="true"> <m:mn>1</m:mn> <m:mo>‾</m:mo> </m:mover> </m:mrow> </m:math> $\overline{1}$ , and the cadmium and zinc ions exhibit distorted trigonal bipyramidal and tetrahedral coordination geometries, respectively. In compound 1 , the carboxylate moieties show different μ 1 - η 1 : η 1 and μ 1 - η 1 : η 0 coordination modes, while in 2 , only the μ 1 - η 1 : η 0 mode is observed.