The
series of metal 8-hydroxyquinolates {[Ni7 (μ2-L
1
)6(μ3-L
1
)2(OAc)2(μ7-L
2
)(OCH3)]·CH3OH·CH3CN} (1), {[Ni7(μ2-L
1
)6(μ3-L
1
)3(SCN)2(μ7-L
2
)(CH3CN)]·(CH3OH)2·CH3CN} (2), [Ni5Dy2(μ2-L
1
)6(OAc)4(μ7-L
2
)2] (3), [Ni6Dy(μ2-L
1
)6(μ3-L
1
)2(OAc)3(μ7-L
2
)(OCH3)] (4), and [Ni6Dy(μ2-L
1
)6(μ3-L
1
)2(OAc)2(NO3)(OH)2(OCH3)2] (5) (HL
1
= 8-hydroxyquinoline, H3
L
2
= 1,1,1-tris(hydroxymethyl)ethane) has been solvothermally
prepared. Those clusters feature a heptanuclear disklike structure
with 8-hydroxyquinolines as corner ligands restricting the expansion
of the triangular lattice in spite of the metal ions or auxiliary
coligands. The magnetic properties of those complexes vary according
to metal ions and auxiliary coligands, for which slow magnetic relaxation
is found in 5.
By adjusting the substituent group of the organic ammonium in three molecular ionic complexes, [A][Fe3O(O2CH)8(H2O)]2 (A = NH3(CH2)3NH3 for 1, CH3NH2(CH2)3NH3 for 2 and CH3CH2NH2(CH2)3NH2CH2CH3 for 3) crystallized in 2/m...
(1), is constructed by an oxo-centered trinuclear iron anion and a semi-rigid ring-like cation 1,4,5,6-tetrahydropyrimidin-ium, which is generated in situ by reacting formic acid and 1,3-propylenediamine. The molecular motion change of anions and cations produces continuously reversible plasticity and ferroelasticity transition on heating and cooling near room temperature.
Homohelical chains with magnetite like valence distribution exhibit ferrimagnetism, canted antiferromagnetism, spin-flop and field-induced SCM like behaviours.
Constructing multiple functional geometric frustration magnets is a hot topic in solid state chemistry and material science. Herein, a two‐dimensional (2D) parallel interpenetrating “star” net complex [HDMPDA][Fe6(μ3‐O)2(μ‐O2CH)15] (1) was obtained successfully with HDMPDA (DMPDA=N, N’‐dimethyl‐1,3‐propanediamine) as charge balancer. The dipole reorientation of the rotator [HDMPDA]+ in the complex brings a structure transition which leads dielectric relaxation close to room temperature. Despite strong antiferromagnetic coupling existing between ions in the net, long‐range order temperature TN of the complex is suppressed to 4.2 K by geometric frustration. Interestingly, below TN, a canted antiferromagnetic state, accompanied with slow magnetic relaxation, is detected due to the lack of enough magnetic coupling between 2D layers. Thus, 1 is a particular multifunctional magnetic frustration material containing two different types of relaxations.
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