A New Hydroxo-bridged Chromium(III) Dimer [Cr(saltn)OH]2·4H2O: Synthesis, Crystal Structure and Magnetic Properties

• Published in: Chinese journal of chemistry Vol. 23; no. 6; pp. 786 - 790
• Main Authors: Zhong-Hai, Ni, Yi-Hua, Zhao, Lei, Zheng, Hui-Zhong, Kou, Ai-Li, Cui
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.06.2005; WILEY‐VCH Verlag
• Subjects: chromium; crystal structure; dimer; magnetic property; synthesis
• ISSN: 1001-604X; 1614-7065
• DOI: 10.1002/cjoc.200590786

A new hydroxo‐bridged dimeric Cr(III) complex [Cr(saltn)OH]2·4H2O [H2saltn=N,N′‐bis(salicylidene)trimethylenediamine] has been synthesized and its structural and magnetic properties have been investigated. The complex crystallizes in the triclinic space group P‐1 with one dimeric formula unit in a cell of dimensions a=0.95828(19) nm, b=0.95926(19) nm, c=1.0437(2) nm, α=86.77(3)°, β=82.48(3)°, and γ=64.93(3)°. The geometry around each chromium(III) center is six‐coordinate, distorted‐octahedral. The bridging Cr2O2 unit is strictly planar, as required by the crystallographic symmetry. The CrOCr′ bridging angle is 99.94(16)°, and the distance between Cr…Cr′ is 0.3019 nm. The magnetic susceptibility of the complex has been examined in the range of 2‐300 K. By using the spin‐spin coupled model for an S1=S2=3/2 dimeric system $({\hat H}=-2J{\hat S}_{1}{\hat S}_{2})$, the magnetic data were fitted to give the parameters of g=2.01(1), J=‐0.85(2) cm‐1, and zJ' =0.18(3)cm‐1, indicating the presence of a weak antiferromagnetic spin‐exchange interaction between the Cr(III) ions in the binuclear complex.