Manganese(II), lead(II) and cadmium(II) coordination complexes containing a tetrazole‐based acylamide ligand: synthesis and the influence of the metal ions on the structures

Three new manganese(II), lead(II) and cadmium(II) coordination complexes have been prepared by reaction of N-(1H-tetra­zol-5-yl)cinnamamide (HNTCA) with divalent metal salts (MnCl2, PbCl2 and CdCl2) in a mixed-solvent system, affording mononuclear to trinuclear structures namely, bis­(methanol-κO)bis­[5-(3-phenyl­prop-2-enamido)-1H-1,2,3,4-tetra­zol-1-ido-κ2N1,O]manganese(II), [Mn(C10H8N5O)2(CH3OH)2], (1), bis­[μ-5-(3-phenyl­prop-2-enamido)-1H-1,2,3,4-tetra­zol-1-ido]-κ3N1,O:N2;κ3N2:N1,O-bis­{aqua[5-(3-phenyl­prop-2-en­am­ido)-1H-1,2,3,4-tetra­zol-1-ido-κ2N1,O]lead(II)}, [Pb2(C10H8N5O)4(H2O)2], (2), and hexa­kis­[μ2-5-(3-phenyl­prop-2-enamido)-1H-1,2,3,4-tetra­zol-1-ido-κ3N1,O:N2]tricadmium(II), [Cd3(C10H8N5O)6], (3). The structures of these three com­pounds reveal that the nature of the metal ions and the side groups of the organic building blocks have a significant effect on the structures of the coordination compounds formed. Inter­molecular hydrogen bonds link the mol­ecules into two-dimensional [complex (1)] and three-dimensional hydrogen-bonded networks. Complexes (2) and (3) show significant fluorescence, while complex (1) displays no fluorescence.