Abstract
Three dimeric copper(II) complexes have been prepared with the general formula bis(2-amino-3,5-dihalopyridinium)hexahalodicuprate cuprate(II): (3,5-diCAPH)2Cu2Br6 (1), (3,5-diBAPH)2Cu2Cl6 (2) and (3,5-diBAPH)2Cu2Br6 (3) [3,5-diCAPH = 2-amino-3,5-dichloropyridinium; 3,5-diBAPH = 2-amino-3,5-dibromopyridinium]. The compounds have been characterized via single crystal X-ray diffraction and temperature dependent magnetic susceptibility measurements. All three compounds crystallize in monoclinic space groups (1, C2/c; 2 and 3, P21/c) and exhibit alternating layers of hexahalodicuprate ions and organic cations. The hexahalodicuprate ions exhibit short X⋯Cu and X⋯X contacts which link the dimers into a square array. Variable temperature magnetic susceptibility data reveal strong intradimer antiferromagnetic exchange (J = −153, −65, −122 K for 1–3, respectively), but negligible inter-dimer magnetic exchange.
![](/cms/asset/e4304b7e-687a-481b-80ce-df959e3117bb/gcoo_a_1413183_uf0001_b.gif)
Acknowledgements
Financial assistance from the NSF (IMR-0314773), the Kresge Foundation, and PCI Synthesis Inc. toward the purchase of the MPMS SQUID magnetometer and X-ray powder diffractometer are gratefully acknowledged. Partial financial support from an anonymous donor for JC during this project is gratefully acknowledged.