Acta Crystallographica Section B

Structural Science

Volume 57, Part 6 (December 2001)

Acta Cryst. (2001). B57, 772-779 [doi:10.1107/S0108768101013568]

Bis(hfac)-copper(II) complexes bridged by pyrimidines showing magnetic interactions

M. Yasui, Y. Ishikawa, T. Ishida, T. Nogami and F. Iwasaki

Abstract: Crystals of bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)bispyrimidinecopper(II) (1), bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)bis(4-methylpyrimidine)copper(II) (2), bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)bis(quinazoline)copper(II) (3) showed ferromagnetic interactions at extremely low temperature. Crystal structure analyses revealed that these complexes were catena-bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)[ [bold mu] -pyrimidine-N¹:N³]copper(II), [Cu(hfac)₂(pm)₂]_n, catena-bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)[-4-methylpyrimidine-N¹:N³]copper(II), [Cu(hfac)₂(4-Me-pm)]_n, and catena-bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)[-pyrimidine-N¹:N³]copper(II), [Cu(hfac)₂(qz)]_n, for (1), (2) and (3), respectively. In (1) and (2) the pyrimidines bridge the Cu atoms with an axial-equatorial mode to form one-dimensional spiral chains. Complex (3) also forms a one-dimensional chain structure. The coordination mode of (3) is axial-axial at room temperature, while axial-equatorial at 120 K. On the other hand, the structure of the other modification of the 4-methylpyrimidine complex (4), showing paramagnetic properties, was revealed to be a trinuclei complex bridged by two 4-methylpyrimidines, tris[bis-(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)copper(II)][bis- [bold mu] -4-methyl-pyrimidine-N¹:N³]. The chain structures with an axial-equatorial coordination mode of the bridging organic moieties should play an important role in the appearance of the ferromagnetic interactions.

Online 29 November 2001


	Structure factor file (CIF format) (111.9 kbytes) Contains datablock 1a

	Structure factor file (CIF format) (108.4 kbytes) Contains datablock 1b

	Structure factor file (CIF format) (232.4 kbytes) Contains datablock 2a

	Structure factor file (CIF format) (221.1 kbytes) Contains datablock 2b

	Structure factor file (CIF format) (247.8 kbytes) Contains datablock 3a

	Structure factor file (CIF format) (236.8 kbytes) Contains datablock 3b

	Structure factor file (CIF format) (322.1 kbytes) Contains datablock 4a

	Structure factor file (CIF format) (302.6 kbytes) Contains datablock 4b

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