A photochromic trinuclear dysprosium(iii) single-molecule magnet with two distinct relaxation processes.

Multifunctional molecules responsive to light are highly desired as components for the construction of remotely controlled nanodevices. Here we present a Dy single molecule magnet (SMM) comprising dithienylethene (dte) photochromic bridging ligands in the form of a pyridine (py) derivative: 1,2-bis((2-methyl-5-pyridyl)thie-3-yl)perfluorocyclo-pentene (dtepy). The title trinuclear compound {[Dy(BHT)](dtepy)}·4CH (1) was synthesized by combining the low-coordinate dysprosium complexes Dy(BHT) (BHT = 2,6-di--butyl-4-methylphenolate) with dtepy bridging ligands in the 'open' form using -pentane as a completely inert solvent.

An intermetallic molecular nanomagnet with the lanthanide coordinated only by transition metals.

Magnetic molecules known as molecular nanomagnets (MNMs) may be the key to ultra-high density data storage. Thus, novel strategies on how to design MNMs are desirable. Here, inspired by the hexagonal structure of the hardest intermetallic magnet SmCo, we have synthesized a nanomagnetic molecule where the central lanthanide (Ln) Er is coordinated solely by three transition metal ions (TM) in a perfectly trigonal planar fashion.

Identical anomalous Raman relaxation exponent in a family of single ion magnets: towards reliable Raman relaxation determination?

Propeller-like lanthanide complexes with suitable chiral ligand scaffolds are highly desired as they combine chirality with possible magnetic bistability. However, the library of relevant chiral lanthanide-based molecules is quite limited. Herein we present the preparation, structures, magnetic behavior as well as EPR studies of a series of propeller-shaped lanthanide Single Ion Magnets (SIMs).

Correlating magnetic anisotropy with [Mo(CN)] geometry of Mn-Mo magnetic frameworks.

Four new three-dimensional (3-D) coordination frameworks based on the heptacyanomolybdate(iii) anion were prepared and characterised by magnetic measurements: {[Mn(imH)][Mn(HO)(imH)][Mn(imH)] [Mo(CN)]·6HO} (1) (imH = imidazole), {[Mn(HO)(imH)][Mn(HO)(imH)][Mo(CN)]·5HO} (2), {[Mn(Htrz)(HO)][Mn(Htrz)(HO)][Mo(CN)]·5.6HO} (3) (Htrz = 1,2,4-triazole) and {[Mn(HO)][Mn(HO)][Mo(CN)]·6HO·2urea} (4). All four compounds exhibit long-range ferrimagnetic ordering and exhibit an opening of their magnetic hysteresis loops at 1.

Cross-linking of cyanide magnetic coordination polymers by rational insertion of formate, cyanide or azide.

Carefully selected molecular bridging ligands formate, cyanide and azide, that are known to transmit strong magnetic interactions, have been successfully inserted into the {[MnII(H2O)2]2[NbIV(CN)8]·4H2O}n (Mn2Nb) ferrimagnetic parent framework, resulting in the additional molecular bridging of the two MnII centres in three new coordination polymers: {(NH4)[(H2O)MnII-(μ-HCOO)-MnII(H2O)][NbIV(CN)8]·3H2O}nMn2NbHCOO, {(NH4)[(NH3)MnII-(μ-CN)-MnII(H2O)][NbIV(CN)8]·2H2O}nMn2NbCN and {(NH4)[(H2O)MnII-(μ-N3)-MnII(H2O)][NbIV(CN)8]·3H2O}nMn2NbN3. The extra bridging ligands cross-linking the two MnII centers strongly influence the long-range ferrimagnetic order of the NbIV-CN-MnII parent framework by introducing competing antiferromagnetic interactions. The values of the JMnMn constants were obtained by fitting the magnetic properties of the MoIV congeners {(NH4)[(H2O)MnII-(μ-HCOO)-MnII(H2O)][MoIV(CN)8]·3H2O}nMn2MoHCOO, {(NH4)[(NH3)MnII-(μ-CN)-MnII(H2O)][MoIV(CN)8]·2H2O}nMn2MoCN and {(NH4)[(H2O)MnII-(μ-N3)-MnII(H2O)][MoIV(CN)8]·3H2O}nMn2MoN3, where the paramagnetic NbIV was substituted by the diamagnetic MoIV, thus disabling the long-range magnetic ordering of the CN-framework.

Cyanide vs. azide "magnetic arm wrestling": Mn-Nb and Mn-Mo magnetic coordination polymers with mixed bridging.

Two magnetic coordination polymers with mixed cyanide-azide bridging based on octacyanoniobate(iv) and octacyanomolybdate(iv) are reported: {(NH)[(HO)Mn-(μ-N)-Mn(HO)][M(CN)]·3HO} MnMN (M = Nb or Mo). Cyanide ligands form the 3-D framework of MnMN, while azide ligands connect two Mn centres together. Both CN and N are known in magnetochemistry for their marked magnetic coupling abilities which in the case of Mn2NbN3 lead to competitive antiferromagnetic interactions within the Nb-CN-Mn and Mn-N-Mn structural motifs.