title: Family of heterometallic semicircular Mn(III)2Ln(III)3 strands.
abstract: A series of heterometallic complexes of formula [Mn(III)(2)Ln(III)(3)(bdeaH)(3)(bdea)(2)(piv)(8)] x MeCN, where bdeaH(2) = N-butyldiethanolamine, piv = pivalate, and Ln = Y (1), Tb (2), Dy (3), Ho (4), and Er (5), has been prepared. 1-5 are isostructural, with the metal centers forming a novel semicircular Ln(III)-Mn(III)-Ln(III)-Mn(III)-Ln(III) strand. Only 2 and 3 exhibit slow relaxation of the magnetization, suggesting that the highly anisotropic Ln(III) ions (Tb(III) and Dy(III)) are essential for an energy barrier to spin reversal.
authors.affiliation: Institut für Anorganische Chemie der Universität Karlsruhe (TH), Karlsruhe Institute of Technology, Engesserstrasse 15, 76131 Karlsruhe, Germany.
authors.forename: Muhammad Nadeem
authors.initials: MN
authors.lastname: Akhtar
authors.forename: Yan-Zhen
authors.initials: YZ
authors.lastname: Zheng
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Lan
authors.forename: Valeriu
authors.initials: V
authors.lastname: Mereacre
authors.forename: Christopher E
authors.initials: CE
authors.lastname: Anson
authors.forename: Annie K
authors.initials: AK
authors.lastname: Powell