Synthesis, crystal structure, and thermal analyses of triaqua-(1,10-phenanthroline-N,N′) succinatomanganese(II) dihydrate, [Mn(H₂O)₃(phen)(C₄H₄O₄)]·2H₂O

Abstract

[Mn(H₂O)₃(phen)(C₄H₄O₄)]·2H₂O was obtained by reaction of freshly prepared MnCO₃, phen and succinic acid in CH₃OH/H₂O (1:1 v/v), and its crystal structure has been determined by single crystal X-ray diffraction methods. The title mixed ligand complex crystallizes in the triclinic space group $P\bar 1$ with cell dimensions a = 7.590(1) Å, b = 9.324(1) Å, c = 13.917(1) Å, α = 85.64(1)°, β = 74.56(1)°, γ = 77.10(1)°, and D _calc = 1.584 g/cm³ for Z = 2. The crystal structure consists of the [Mn(H₂O)₃(phen)(C₄H₄O₄)] complex molecules and lattice H₂O molecules. The Mn atoms are each octahedrally coordinated by two N atoms of one phen ligand and four O atoms of three H₂O molecules and one succinato ligand with d(Mn—N) = 2.271 and 2.299 Å, and d(Mn—O) = 2.133–2.239 Å. Through intermolecular hydrogen bondings, the complex molecules are interlinked to form 2D layers, which are assembled by π–π stacking interactions into 3D framework with tunnels occupied by the lattice H₂O molecules. Thermal analyses showed that the title compound decomposes in two steps over the range 25–600°C upon heating in flowing Ar.