A New Family of High-Dimensional Molecular Magnets Built from the Manganese-Azido System. Syntheses, Structures, and Magnetic Characterization of Two New Ferro-Antiferromagnetic Two-Dimensional Complexes.
Two new compounds in the series of general formula [Mn(L)(2)(N(3))(2)](n)() in which L = 4-cyanopyridine (1) or 3-acetylpyridine (2) have been obtained and structurally and magnetically characterized. Both compounds crystallize in the monoclinic system, space group P2(1)/a, formula [C(12)H(8)MnN(10)] with a = 13.286(4) Å, b = 8.340(3) Å, c = 13.579(4) Å, beta = 90.55(2) degrees, and Z = 4 for compound 1 and space group P2(1)/c, formula [C(14)H(14)MnN(8)O(2)] with a = 11.843(4) Å, b = 9.550(3) Å, c = 14.998(5) Å, beta = 105.99(3) degrees, and Z = 4 for compound 2. The two compounds show a similar arrangement of alternating end-to-end and end-on azido bridges between the manganese atoms, giving magnetically alternated ferro-antiferromagnetic two-dimensional compounds. The pyridyl ligands coordinated to the axial sites stick out above and below the 2-D sheets, and intersheet pi-pi interactions are formed between the pyridyl ligands, playing a role in the structural differences. The low-temperature magnetic properties of 1 and 2, together with those of the previously reported compounds with L = pyridine (3), 4-acetylpyridine (4), and ethyl isonicotinate (5), are reported. Magnetic ordering and spontaneous magnetization is achieved at T(C) = 18, 16, 40, 28, and 16 K for 1-5, respectively.
Escuer
Albert
A
Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain, Chemistry Department, Faculty of Science, Kuwait University, P.O. Box 5969 Safat, 13060 Kuwait, and Institut für Physikalische und Theoretische Chemie, Technische Universität Graz, A-8010 Graz, Austria.
Vicente
Ramon
R
Goher
Mohamed A. S.
MA
Mautner
Franz A.
FA