The Mn(II)-2,2′-dipyridylamine-pseudohalide system: Synthesis, crystal structure and luminescence behaviour of [Mn(dpa)2(X)2] · H2O and [Mn(dpa)2(X)(OH2)]ClO4 (dpa = 2,2′-dipyridylamine; X=N3-, NCO−)

Four mononuclear complexes of the type [Mn(dpa)2(X)2] · H2O (dpa = 2,2′-dipyridylamine; X=N3-,1; X = NCO−, 2) and [Mn(dpa)2(X)(OH2)]ClO4 (X=N3-,3; X = NCO−, 4) were synthesized using single-pot reactions of manganese(II) salt, dpa and X in 1:2:2 and 1:2:1 molar ratios, respectively. The compounds have been characterized by X-ray crystallography, microanalytical, physicochemical, spectroscopic and magnetic results. Supramolecular 2D sheet structures are obtained, arising from N-H⋯N, O-H⋯N, N-H⋯O and O-H⋯O weak intermolecular forces. All thecomplexes display high-energyintraligand 1(π-π*) fluroscence and intraligand 3(π-π*) phosphorescence in glassy solutions (DMF at 77 K).