Wydział Chemii

Elena A. Buvaylo

Vladimir N. Kokozay

Olga Yu. Vassilyeva

Brian W. Skelton

Mikhail M. Degtyarik

Maria Korabik

Julia Jezierska

2015

Journal of Coordination Chemistry

68

1261-1272

10.1080/00958972.2015.1019874

Naukowa

Angielski

Artykuł

[Mn(5-ATZ)₂Cl₂]_n (1) (5-ATZ – 5-amino-1-H-tetrazole) was synthesized from the reaction of 5-ATZ and manganese(II) chloride and isolated by solution evaporation at room temperature. 1 was characterized by elemental analysis, X-ray crystallography, infrared, and EPR spectroscopy as well as magnetic measurements. In the crystal structure, [Mn(5-ATZ)₂Cl₂] units are linked by double μ₂-bridging chlorides to form 1-D chains parallel to the a-axis. The Mn sphere approximates to octahedral with the metal coordinated by four chlorides in the equatorial plane and two 5-ATZ molecules, bound through their ring nitrogens, in axial positions. The intramolecular N–H···Cl hydrogen bond between the 5-ATZ amino group and the adjacent coordinated Cl⁻ stabilizes the chain. N–H···N hydrogen bonds between adjacent chains form a 3-D supramolecular framework. No hyperfine coupling to the Mn nuclei (I = 5/2) is observed in the powdered EPR spectrum of 1 at 77 K. The frozen solution EPR spectrum provides evidence of the mononuclearity of 1 in methanol. The magnetic properties have been analyzed using the Hamiltonian H = –J∑S_i · S_i+1 with J = −1.38(3) cm⁻¹ and g = 2.00(1). A small value of the exchange parameter is typical for 1-D six-coordinate bis(μ₂-chloro) Mn(II) polymers.

Manganese(II) polymer, 5-Amino-1-H-tetrazole, μ2-Bridging chloride, hydrogen bonding, EPR, Antiferromagnetic properties

http://dx.doi.org/10.1080/00958972.2015.1019874