Temperature-dependent Syntheses of Two Manganese(II) Coordination Compounds Based on an Ether-bridged Tetracarbolylic Acid

Abstract

0D dinuclear manganese(II) coordination compound and 1D chain manganese(II) coordination polymer, namely [Mn-2(mu-L)(phen)(4)]center dot 4H(2)O (1) and {[Mn-2(mu(5)-L)(phen)(2)]center dot H2O}(n) (2), have been constructed hydrothermally using H4L (H4L = 2,3,3',4'-diphenyl ether tetracarboxylic acid), phen (phen = 1,10-phenanthroline), and manganese chloride at 120 and 160 degrees C, respectively. The products were isolated as stable crystalline solids and were characterized by IR spectra, elemental analyses, thermogravimetric analyses (TGA), and single-crystal X-ray diffraction analyses. Single-crystal X-ray diffraction analyses revealed that two compounds crystallize in the triclinic or monoclinic system, space group P (1) over bar or P2(1)/c. Compound 1 discloses a discrete dimeric structure, which is assembled into a 3D supramolecular framework through O-H center dot center dot center dot O hydrogen bond. Compound 2 has a chain structure. Structural differences between compounds 1 and 2 are attributed to the different reaction temperature. Magnetic studies for compound 2 demonstrate an antiferromagnetic coupling between the adjacent Mn(II) centers.