Alternating ferromagnetic and antiferromagnetic interactions in the azido-bridged copper(II) chain compound [Cu(phen)(N_3)_2]_n

摘要

Single crystals of a copper(II) chain compound~(**),[Cu(phen)(N_3)_2]_n (phen = 1,10-phenanthroline), were obtained and its crystal structure was determined by X-ray diffraction methods. The complex crystallizes in the space group P1 and is made up of neutral chains of copper(II) ions bridged by two azide groups exhibiting an asymmetrical tridentate #mu#(1,1,3) coordination mode. The copper atoms have a distorted CuN_6 octahedral environment: the basal plane is built of two nitrogen atoms from a chelating phen molecule and two azide nitrogens from one bridging and one terminal azide, whereas two nitrogens from two bridging azides fill the axial positions. The intrachain copper(II)-copper(II) separation is 3.396(1) and 5.700(1) A. The magnetic behavior was investigated in the 5-300 K range. Weak intrachain alternating antiferromagnetic (J = -6.56cm~(-1)) and ferromagnetic (#alpah#J = 12.76 cm~(-1)) interactions were observed.