3d–4f heterometallic trinuclear complexes derived from amine-phenol tripodal ligands exhibiting magnetic and luminescent properties. Issue 4 (5th January 2017)

• Record Type: Journal Article
• Authors: Wen, He-Rui; Dong, Piao-Ping; Liu, Sui-Jun; Liao, Jin-Sheng; Liang, Fu-Yong; Liu, Cai-Ming
• Is Part Of: Dalton transactions. Volume 46:Issue 4(2017)
• Page Start: 1153
• Page End: 1162
• Publication Date: 2017-01-05
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c6dt04027f
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The syntheses, crystal structures, and magnetic properties of a family of new 3d–4f heterometallic trinuclear complexes were investigated. Slow magnetic relaxation was observed for the Zn–Dy–Zn complex besides stronger fluorescent emissions. Abstract : A new family of 3d–4f heterometallic trinuclear complexes, namely [M2 LnL2 ]·2ClO4 ·H2 O (H3 L = tris(((2-hydroxy-3-methoxybenzy1)amino)ethyl)amine, where M = Ni, Ln = Gd (1 ), Dy (2 ), and M = Zn, Ln = Gd (3 ), Dy (4 )) were synthesized via the reaction of H3 L and Ln(NO3 )3 ·6H2 O and Ni(ClO4 )2 ·6H2 O or Zn(ClO4 )2 ·6H2 O in a 2 : 1 : 2 ratio in the solution. Complexes1–4 consisted of three metal ions arranged in an isosceles triangle manner. Magnetic properties investigations showed that complexes1 and2 exhibited weak ferromagnetic coupling between the Ni(ii ) and Ln(iii ) ions, whereas complex4 displayed lanthanide single-ion magnetic properties. The alternating current (ac) magnetic susceptibilities of4 revealed that both the in-phase ( χ ′) and out-of-phase ( χ ′′) signals are frequency- and temperature-dependent, which are typical features of the field-induced slow relaxation of the magnetization with U eff = 124.5 K. Complex4 also exhibited an obvious butterfly-shaped hysteresis loop at 2 K, indicating that it is a single-ion magnet. Moreover, complex4 showed stronger fluorescent emissions, which were typical narrow emission bands of lanthanide ions. Therefore, complex4 can be considered as a molecular magnetic and luminescent material. Comparably, complex2 showed very weak Dy III -based emissions because the paramagnetic Ni II ions quench the fluorescence and thereby lower the population of the triplet state.