Magnetic Susceptibility and Crystal Structure of (Pyridine N-Oxide)-Copper(II) Chloride

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Abstract
Magnetic susceptibility of (pyridine N‐oxide)‐copper(II) chloride, C5H5NOCuCl2, has been measured by the Faraday method from 90° to 300°K. The magnetic moment decreases rapidly with temperature; the dimeric structure proposed on the basis of magnetic behavior has been confirmed by the results of crystal structure determination. The crystals are monoclinic, P 21/b—C2h5, with four copper atoms in the unit cell of dimensions: a = 5.844 Å, b = 10.049 Å, c = 13.643 Å (all ±0.005 Å), γ = 104° 52′±10′. Data were collected by Weissenberg photography. The structure was determined from Patterson projections on (100) and (010) and refined by two dimensional electron density difference syntheses. The Cu–Cu internuclear distance of 3.23 Å is quite a bit larger than that observed in a number of dimeric copper systems. Another novel feature of the dimer is that it has distorted tetrahedral environment for copper in a binuclear system and consists of two distorted bisphenoids which share an edge.