MAGNETIC PROPERTIES AND STRUCTURE OF NEW COMPOUND DICHLOROBIS(1-ALLYLTETRAZOLE)COBALT(II). L.G. Lavrenova, V.N. Ikorskii, A.V. Virovets, N.V. Podberezskaya, G.A. Bikzhanova, S.V. Larionov, Institute of Inorganic Chemistry SB RAS, Novosibirsk, Russia

The new complex compound of CoCl₂ with 1-allyltetrazole (altz) of composition Co(altz)₂Cl₂ was prepared and its crystal structure (at 300 K) and magnetic properties in the 78-300 K range were investigated. Co(altz)₂Cl₂ shows antiferromagnetic ordering with weak ferromagnetism, the Neel temperature is 102 K. The magnitude of spontaneous magnetic moment at 80 K is 665 Gcm³mol^-1

In the crystal Co(altz)₂ units are connected by symmetrical Cl bridges into layers as in isostructural Cu(altz)₂Cl₂ (Zhurnal Structurnoi Khimii (Russian), 37(1996) 330). Co-Cl and Co-N distances are 2.538(1) and 2.085(3) Å respectively, angle Co-Cl-Co is 143.22(4)^o. The structure at 300 K (and probably at lower temperature) is quasi-two-dimensional because the layers are separated by long van der Waals contacts (C...C3.55 Å). At the same time in Cu analog the ferromagnetic ordering takes place (the Curie temperature is 10 K, the magnetization at 4.3 K in the 10.9 kOe field is 5523 Gcm³mol^-1, Zhurnal Neorgan.Khimii (Russian), 38(1993) 1517).