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The preparation and structures of seven compounds that contain the Cr3(dpa)4(2+) core (dpa = the anion di(2-pyridyl)amide) are reported. The magnetic properties of several have been measured. In each case there are anionic ligands at each end of the Cr3(6+) chain, sometimes identical (2Cl-, 2CCPh-), sometimes different (Cl-, BF4-; Cl-, PF6-). Several of these compounds have a symmetrical arrangement of the three Cr atoms, with the two Cr-Cr distances equal at ca. 2.36 A, while others have an unsymmetrical arrangement. In the most extreme case the two Cr-Cr distances are 2.00 and 2.64 A. The electronic structures and the remarkable flexibility of the Cr3 arrangement are discussed.

Linear Trichromium Complexes with Direct Cr to Cr Contacts. 1. Compounds with Cr3(dipyridylamide)42+ Cores

Linear Trichromium Complexes with Direct Cr to Cr Contacts. 1. Compounds with Cr₃(dipyridylamide)₄²⁺ Cores