Temperature‐induced formation of two dinuclear dysprosium complexes with different magnetic properties. (3rd March 2020)

• Record Type: Journal Article
• Authors: Zhu, Zhong‐Hong; Wang, Hai‐Ling; Yu, Shui; Fu, Xiao‐Xiao; Zou, Hua‐Hong; Chen, Zilu; Liang, Fu‐Pei
• Is Part Of: Applied organometallic chemistry. Volume 34:Number 5(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-03-03
• Subjects: dinuclear dysprosium -- in situ reaction -- temperature‐induced -- complexes -- magnetic properties; Organometallic chemistry -- Periodicals; Organometallic compounds -- Periodicals; 547.05
• DOI: 10.1002/aoc.5622
• Languages: English
• ISSNs: 0268-2605

Abstract

Abstract : A dinuclear Dy (III) complex [Dy2 (L 1 )2 (NO3 )4 ]·2CH3 CN (1 ) (HL 1 = 1, 3‐ bis {[( E )‐pyridin‐2‐ylmethylene]amino}propan‐2‐ol) was obtained via the reaction of 1, 3‐diamino‐2‐propanol, 2‐pyridyaldehyde and Dy (NO3 )3 ·6H2 O at room temperature. In the structure of complex 1, two Dy (III) ions are in the N4 O6 coordination environment provided by NO3 − and (L 1 ) −, and both of these ions are in the sphenocorona configuration. [Dy2 (L 2 )2 (NO3 )4 ] (2 ) [HL 2 = 2‐(pyridin‐2‐yl)hexahydropyrimidin‐5‐ol] was obtained using the same reaction material only when the reaction temperature was changed to 60°C. Structural analysis of complex 2 showed that the two Dy (III) ions with the same coordination configuration are in the N3 O6 coordination environment provided by NO3 − and (L 2 ) − and are in the distorted spherical‐capped square antiprism. Surprisingly, HL 2 with the parent of bipyridine was synthesized by the Schiff base reaction of 1, 3‐diamino‐2‐propanol with 2‐pyridoxaldehyde followed by the ring‐closing reaction catalyzed by Dy (III) ions. Magnetic measurements of the Dy (III) complexes revealed no obvious frequency‐dependent behavior of complex 1 . In contrast, complex 2 showed an obvious frequency dependence ( U eff = 0.49 K and τ 0 = 6.62 × 10 −4 s) under the condition of zero field and a weak double relaxation behavior ( U eff = 9.25 K and τ 0 = 9.70 × 10 −4 s) at 1500 Oe. Abstract : In general, achieving an in situ tandem reaction during the formation of lanthanide complexes is difficult. This phenomenon is one of the rare examples of complex in situ tandem reactions that occur during the formation of lanthanide complexes.