Mn-2(H2O)[O2C(CH2)(n)CO2](2) (n=3-12): Replication of an inorganic monolayer in three-dimensional (dicarboxylato)manganese(II)

A series of novel manganese alpha,omega -dicarboxylates, Mn-2(H2O)[O2C(CH2) (n)CO2](2) (n = 3-12), were synthesized as single crystals or polycrystalli nes by the hydrothermal. reaction of MnCl2 with the corresponding dicarboxy lic acid in the presence of base. Mn-2(H2O)[O-2(CH2)(3)CO2](2) and Mn-2(H2O )[O2C(CH2)(5)CO2](2) (n = 3 and 5) crystallized in the orthorhombic space g roup Pbcm (No. 15), with a = 7.6701(6) Angstrom, b = 9.1156(4) Angstrom, c = 17.975(1) Angstrom, and Z = 4 and with a = 7.6089(8) Angstrom, b = 9.167( 2) Angstrom, c = 23.070(3) Angstrom, and Z = 4, respectively. Using various alpha,omega -dicarboxylates with different numbers of carbons in alkyl cha ins, the interlayer spacings of the manganese(II) compounds have been varie d from 8.99 to 20.42 Angstrom. Their organic chains between two terminal ca rboxylates are close-packed and self-assembled between Mn-O layers. The rel ative conformations of two terminal carboxylate groups determine the spacin g groups of crystal structures. All the prepared manganese dicarboxylate co mpounds involve the replication of the local crystal structure in the Mn-O monolayer to present an antiferromagnetic interaction.