Dinuclear Mesogens with Antiferromagnetic Properties

Szydłowska, Jadwiga; Krówczyński, Adam; Pociecha, Damian; Szczytko, Jacek; Budzowski, P.; Twardowski, A.; Górecka, Ewa

doi:10.1002/cphc.200900880

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…25,26 The physical properties of pyrazine derivatives, such as dipole moment, π-stacking interactions and base strength, are usually quite different from those of other electron-deficient aza-aromatics. 27,28 Metal ion complexes of pyrazine-based ligands have found applications as light-harvesting antennae, 29,30 liquid crystals 31 and molecular wires, 32,33 and bridging pyrazine units have often proved to be efficient mediators of intermetallic coupling. 34,35 Magnetic interactions between pyrazine-bridged paramagnetic centers take place mainly via the pyrazine ring 36 and while this is usually associated with antiferromagnetic exchange, [37][38][39] some examples of copper(II) complexes which show ferromagnetic coupling are also known.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of transition metal ion complexes of a hybrid pyrazine–terpyridine ligand

et al. 2013

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A new hybrid pyrazine-terpyridine ligand L (C(34)H(22)N(8)) and its complexes with different transition metal ions, M (M = Mn(II) 1, Zn(II) 2, Fe(II) 3, Co(II) 4, Cu(II) 5 and Cd(II) 6), have been synthesised. In the presence of a nitrate counter-anion, both Cu(II) and Cd(II) give complexes in which the ratio M:L is 2:1, whereas with perchlorate, trifluoromethanesulfonate or tetrafluoroborate, the other metal ions provide solids in which this ratio is 1:1. From mass spectral measurements and a single crystal, X-ray structure determination for the Fe(II) complex 3, however, all the latter species are concluded to be 2:2 complexes. Both the Fe(II) complex 3 and the Co(II) complex 4, generated from tetrafluoroborate reactant salts, have the composition [M(2)L(2)F(2)(H(2)O)](BF(4))(2), the presence of fluoride ligands being presumed to reflect the abstraction of fluoride ions from tetrafluoroborate by the metal ions under the preparative conditions. The crystal structure of complex 3 shows the Fe(II) centres to be inequivalent, one being high-spin and heptacoordinate with a FeN(4)F(2)O coordination sphere, the other low-spin and octahedral with a FeN(6) sphere. The two ligand molecules differ markedly, one being heptadentate, the other clearly "hypodentate", with only three N-donor atoms of a terpyridine-like arm coordinated, although their conformations are similar, showing significant differences from that of C(2) symmetry found for the free ligand by a crystal structure determination. Mass spectra are consistent with the Cu(II) and Cd(II) complexes having the composition [M(2)L(H(2)O)(n)(NO(3))(4-n)](NO(3))(4-n), and the weak antiferromagnetic coupling observed for the Cu(II) complex is consistent with a preliminary crystal structure determination which indicates that the two Cu(II) centres are not bridged by a pyrazine unit.

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Section: Introductionmentioning

confidence: 99%

Self-assembly of transition metal ion complexes of a hybrid pyrazine–terpyridine ligand

et al. 2013

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Hetero-Bimetallic Ferrocene-Containing Zinc(II)-Terpyridyl-Based Metallomesogen: Structural and Electrochemical Characterization

et al. 2023

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The synthesis, as well as the mesomorphic and electrochemical properties, of a hetero-bimetallic coordination complex able to self-assemble into a columnar liquid crystalline phase is reported herein. The mesomorphic properties were investigated by polarized optical microscopy (POM), differential scanning calorimetry (DSC) and Powder X-ray diffraction (PXRD) analysis. Electrochemical properties were explored by cyclic voltammetry (CV), relating the hetero-bimetallic complex behaviour to previously reported analogous monometallic Zn(II) compounds. The obtained results highlight how the presence of the second metal centre and the supramolecular arrangement in the condensed state pilot the function and properties of the new hetero-bimetallic Zn/Fe coordination complex.

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Dinuclear Mesogens with Antiferromagnetic Properties

Cited by 2 publications

References 31 publications

Self-assembly of transition metal ion complexes of a hybrid pyrazine–terpyridine ligand

Self-assembly of transition metal ion complexes of a hybrid pyrazine–terpyridine ligand

Hetero-Bimetallic Ferrocene-Containing Zinc(II)-Terpyridyl-Based Metallomesogen: Structural and Electrochemical Characterization

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