D. Hodgson, M. H. Zietlow, E. Pedersen
Sep 1, 1988
Citations
0
Influential Citations
25
Citations
Journal
Inorganica Chimica Acta
Abstract
Abstract The binuclear complex di-μ-hydroxobis{[tris(2-pyridylmethyl)amine]chromium(III)} perchlorate tetrahydrate, [Cr(C18H18N4)OH]2(ClO4)4·4H2O or [Cr(tpa)OH]2(ClO4)4·4H2O, has been synthesized and characterized. The complex crystallizes in space group P21/n of the monoclinic system with two binuclear units in a cell of dimensions a = 11.381(5), b = 17.856(4), c = 13.050(7) A, β = 111.83(4)°. The structure has been refined to a final value of the conventional R factor of 0.056 on the basis of 3546 independent intensities. The geometry at the chromium is roughly octahedral, and the bridging unit has a CrOCr angle (φ) of 100.53(8)°. The CrCr separation is 3.003(1) A, and the hydrogen atom on the bridging OH group sits 0.30 A from the Cr2O2 plane, leading to a dihedral angle θ of 26.6°. The magnetic susceptibility of the complex indicates antiferromagnetic coupling, with the ground state singlet lying 30.58(6) cm−1 below the lowest lying triplet state.