Syntheses and structures of magnesium complexes with alpha,omega-dicarboxylato ligands; Dicarboxylate = succinate, glutarate, and suberate [German]

摘要

Crystals of (Tetraaqua)(succinato)magnesium (1), (Tetraaqua) (glutarato) magnesium (2) und (Triaqua)-(suberato)magnesium (3) were obtained by layering an aqueous solution of the respective sodium salt with a solution Of MgCl2 in isopropanol. In 1 a chain structure is realized. Mg(H2O)(4) units are bridged in trans orientation by alpha,omega-bonded succinate groups. 2 contains also chains. Glutarato groups are bonded in a cis fashion to Mg(H2O)(4) units. They form bridges by using their two alpha O atoms. 3 represents a layer structure. The basic structural motives are alpha,alpha,omega-bonded suberate, and fac-Mg(H2O)(3) units. All three structures contain efficient H bridging systems. The connection between the symmetry of the polymeric groups (chains or layer) and the symmetry of the underlying space groups is discussed. 1: Space group P2(1)/c, Z = 4, lattice constants at 20degreesC: a=7.441(2), b=14.827(2), c=7.771(2)Angstrom; beta=99.77(3)degrees, R1=0.052. 2: Space group C2/c, Z = 8, lattice constants at 20degreesC: a=12.867(2), b=7.109(1), c=21.683(3)Angstrom; beta=107.33(2)degrees, R-i=0.032. 3: Space group P2(1)/a. Z=4, lattice constants at 20degreesC: a=9.174(2), b=8.071(2), c=15.960(3)Angstrom: beta=104.29(2)degrees; R-i=0.052. [References: 21]