Abstract
The synthesis and characterizations of a family of isomorphous [Mn III 2M III 4L 2(μ 4-O) 2(N 3) 2(CH 3O) 2(CH 3OH) 4(NO 3) 2] ·2H 2O (M = Y(1), Gd(2), Tb(3), Dy(4)) are reported, where H 4L = N,N′-dihydroxyethyl-N,N′-(2-hydroxy-4,5- dimethylbenzyl)ethylenediamine. They were obtained from the reactions of H 4L with M(NO 3) 3·6H 2O, Mn(ClO 4) 2·6H 2O, NaN 3 and NEt 3 in a 1:1:1:2:2 molar ratio. The core structure consists of a Mn 2M 4 unit. The four M III ions that are held together by two μ 4-bridging oxygen atoms form a butterfly M 4 moiety. The M 4 core is further connected to the two five-coordinate trigonal-bipyramidal Mn III ions via one μ 4-O 2-, two alkyloxo and one methoxo triple bridges. Magnetic susceptibility measurements indicate the presence of intramolecular antiferromagnetic interactions in complex 2, and overall intramolecular ferromagnetic interactions in complexes 3 and 4. The alternating current (AC) magnetic susceptibility studies revealed that complexes 3 and 4 showed frequency-dependent out-of-phase signals, which indicates that they exhibit slow relaxation of the magnetization.
| Original language | English |
|---|---|
| Pages (from-to) | 10589-10595 |
| Number of pages | 7 |
| Journal | Dalton Transactions |
| Volume | 41 |
| Issue number | 35 |
| DOIs | |
| Publication status | Published - 21 Sept 2012 |
| Externally published | Yes |