title: 2-tert-Butyl-5-(2-pyridyl)-2H-tetrazole as a chelating ligand in the direct synthesis of novel Cu(II) and heterobimetallic Cu(II)/Mn(II) complexes.
abstract: For the first time, a representative of the 2,5-disubstituted tetrazoles, namely, 2-tert-butyl-5-(2-pyridyl)-2H-tetrazole (L), has been found to participate in oxidative dissolution of copper powder in homometalic systems Cu0–L–NH4X–DMSO (X = Cl, SCN, ClO4) and heterobimetallic ones Cu0–Mn(OAc)2–L–NH4OAc–Solv (Solv = DMSO, DMF), providing the formation of molecular homometallic complexes [CuL2Cl2] (1), [CuL2(SCN)2] (2), and [CuL2(H2O)](ClO4)2 (3), heterobimetallic complex [Cu2MnL2(OAc)6] (4) from DMF solution and its mixture with complex [Cu2MnL2(OAc)6]·2DMSO (5) from DMSO solution. Free ligand L and complexes 1–4 were characterized by elemental analysis, IR spectroscopy, thermal and X-ray single crystal analyses, whereas complex 5 was characterized by X-ray analysis only. Compounds 1–3 are mononuclear complexes, with chelating coordination mode of L via the tetrazole ring N4 and pyridine ring N7 atoms. Heterobimetallic complexes 4 and 5 possess trinuclear structures, with a linear Cu–Mn–Cu arrangement of the metal atoms, linked by the acetate anions; each copper(II) atom is decorated by a chelating unit of L via the tetrazole ring N1 and pyridine ring N7 atoms in complex 4, and via the N4, N7 atoms in complex 5. Temperature-dependent magnetic susceptibility measurements of complex 4 revealed a weak antiferromagnetic coupling between the paramagnetic copper(II) and manganese(II) ions (J = −2.5 cm(−1), g(Cu) = 2.25 and g(Mn) = 2.01), with magnetic exchange through the acetato bridges.
authors.affiliation: Research Institute for Physical Chemical Problems, Belarusian State University, Leningradskaya 14, 220030 Minsk, Belarus.
authors.forename: Anastasiya P
authors.initials: AP
authors.lastname: Mosalkova
authors.forename: Sergei V
authors.initials: SV
authors.lastname: Voitekhovich
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Lyakhov
authors.forename: Ludmila S
authors.initials: LS
authors.lastname: Ivashkevich
authors.forename: Jochen
authors.initials: J
authors.lastname: Lach
authors.forename: Berthold
authors.initials: B
authors.lastname: Kersting
authors.forename: Pavel N
authors.initials: PN
authors.lastname: Gaponik
authors.forename: Oleg A
authors.initials: OA
authors.lastname: Ivashkevich
mesh_terms: D002614:Chelating Agents / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008024:Ligands; D008345:Manganese / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D011725:Pyridines / Q000737:chemistry*; D013777:Tetrazoles / Q000737:chemistry*
chemical_list: C581979:2-tert-butyl-5-(2-pyridyl)-2H-tetrazole; D002614:Chelating Agents; D056831:Coordination Complexes; D008024:Ligands; D011725:Pyridines; D013777:Tetrazoles; D008345:Manganese; D003300:Copper