名称:
Preparation and structural characterization of catena-μ(1,3)-azido-μ(O,N-picolinato)-aquamanganese(II), Mn(NC5H4CO2)(N3)(H2O)
摘要:
A mixed ligand complex of manganese(II) azide with picolinic acid, namely catena-mu(1,3)-azido-mu(O,N-picolinato)aquamanganese(II), was synthesized and characterized by X-ray crystallography. The coordination environment of the manganese(II) atom is a distorted octahedron. Each metal atom, which links a water molecule [Mn-O(1) = 2.218(3) angstrom], is chelated by a picolinato anion [via its ring nitrogen atom, Mn-N = 2.278(3) angstrom, and a carboxylato oxygen atom, Mn-O(2) = 2.167(2) angstrom]. The chelating carboxylate O(2) atom is further bridging another manganese atom giving rise to a centrosymmetric dimeric Mn2O2 [Mn-O(2a) = 2.243(2) angstrom]. These dimeric units are connected to mu(1,3) bridging azido ligands [Mn-N = 2.167(3) and 2.219(3) angstrom] to form a two dimensional layer structure along the ab plane. Each water molecule forms two O-H ... O hydrogen bonds with the non-chelating carboxylate oxygen atoms of two adjacent picolinato groups. The IR and Raman spectra are also reported and correlated with the structure of the complex. The vibrational bands of diagnostic value are compared to the values of the carbolic acid and the free anion.