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Family of Heterometallic Semicircular MnIII2LnIII3 Strands

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journal contribution
posted on 20.04.2009, 00:00 by Muhammad Nadeem Akhtar, Yan-Zhen Zheng, Yanhua Lan, Valeriu Mereacre, Christopher E. Anson, Annie K. Powell
A series of heterometallic complexes of formula [MnIII2LnIII3(bdeaH)3(bdea)2(piv)8]·MeCN, where bdeaH2 = N-butyldiethanolamine, piv = pivalate, and Ln = Y (1), Tb (2), Dy (3), Ho (4), and Er (5), has been prepared. 15 are isostructural, with the metal centers forming a novel semicircular LnIII−MnIII−LnIII−MnIII−LnIII strand. Only 2 and 3 exhibit slow relaxation of the magnetization, suggesting that the highly anisotropic LnIII ions (TbIII and DyIII) are essential for an energy barrier to spin reversal.