Mesogenic Ni(ii) and Cu(ii) complexes of barbituric acid derivatives—toward one-dimensional magnets

Głębowska, Agata; Kamieńska‐Trela, Krystyna; Krówczyński, Adam; Pociecha, Damian; Szydłowska, Jadwiga; Szczytko, Jacek; Twardowski, A.; Wójcik, Jacek; Górecka, Ewa

doi:10.1039/b807656a

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…In order to obtain 1D magnets, mononuclear Ni(II) and Cu(II) complexes of barbituric acid derivatives 306 with Col h phases were prepared (Scheme 140). 577 SQUID experiments revealed that the ferromagnetic state is observed for Ni(II) complexes of 306 at low temperatures. It was proposed that the spin interactions leading to ferromagnetism are enhanced by bridging the metal complexes along the columns due to chelation of the metal ions by atoms of neighboring molecules (Scheme 140, right).…”

Section: Metallomesogensmentioning

confidence: 99%

Discotic Liquid Crystals

et al. 2015

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Section: Metallomesogensmentioning

confidence: 99%

Discotic Liquid Crystals

et al. 2015

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“…A recently synthesized Ni II complex of a barbituric acid derivative confirms this possibility, showing a weak ferromagnetic coupling for the glassy columnar phase. [24,25] Moreover, strictly 1D ferromagnetic order cannot exist due to the Ising instability. To break this limitation, transverse spin-spin interactions are necessary.…”

Section: Introductionmentioning

confidence: 99%

Dinuclear Mesogens with Antiferromagnetic Properties

Szydłowska¹,

Krówczyński²,

Pociecha³

et al. 2010

ChemPhysChem

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Herein, two new groups of isomeric bimetallic nickel(II) and copper(II) complexes containing pyrazine or pyrimidine rings are synthesized and examined. The complexes exhibit liquid-crystalline columnar phases in a broad temperature range. For the copper(II) complexes, super-exchange coupling between two Cu(II) ions is observed. For the pyrimidine derivative in which the paramagnetic Cu(II) ions are separated only by three atoms, an antiferromagnetic spin alignment is detected. When the distance between Cu(II) ions increases to four atoms in the pyrazine derivative, the magnetic interaction becomes significantly weaker.

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“…By using a combination of Knoevenagel condensation and Michael addition, the dimerized or even trimerized organic derivatives are obtained. The coordination of the derivatives of DMBA relies on the electrophilic O atoms of OC groups from barbiturate rings . The existence of multiple carbonyl groups of the derivatives of DMBA, with varied coordination modes, makes the obtained complexes more complicated.…”

Section: Introductionmentioning

confidence: 99%

Pressure-Dependent Pseudo-Polymorphism of Polymeric {[Cu₂(TBA)]·2H₂O}_n and Dinuclear [Cu₂(TBA)(H₂O)₂]·2H₂O Complexes Based on in Situ Tetramerization of DMBA

Liu

Zheng

et al. 2014

Crystal Growth & Design

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Two new pressure-dependent pseudo-polymorphism complexes, a 2D polymeric {[Cu 2 (TBA)]•2H 2 O} n (1) and a dinuclear [Cu 2 (TBA)(H 2 O) 2 ]•2H 2 O (2), were successfully obtained and demonstrated to possess weak antiferromagnetic properties. The synthesis has been achieved through a novel onepot reaction where four DMBA (DMBA = 1,3-dimethyl-barbitiric acid) molecules tetramerized in situ with EtOH to give (TBA) 4− (H 4 TBA = 1,1′,2,2′-tetra-barbiturate-ethene) ligand. This unprecedented tetramerization involves one-pot formation of one new CC bond and four new C−C bonds. It was shown that the formation of 1 strictly relied on the use of Cu(II) ion and EtOH and that reactions of oxidation, Knoevenagel condensation, and Michael addition probably induce the tetramerization.

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Mesogenic Ni(ii) and Cu(ii) complexes of barbituric acid derivatives—toward one-dimensional magnets

Cited by 8 publications

References 5 publications

Discotic Liquid Crystals

Discotic Liquid Crystals

Dinuclear Mesogens with Antiferromagnetic Properties

Pressure-Dependent Pseudo-Polymorphism of Polymeric {[Cu₂(TBA)]·2H₂O}_n and Dinuclear [Cu₂(TBA)(H₂O)₂]·2H₂O Complexes Based on in Situ Tetramerization of DMBA

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Mesogenic Ni(ii) and Cu(ii) complexes of barbituric acid derivatives—toward one-dimensional magnets

Cited by 8 publications

References 5 publications

Discotic Liquid Crystals

Discotic Liquid Crystals

Dinuclear Mesogens with Antiferromagnetic Properties

Pressure-Dependent Pseudo-Polymorphism of Polymeric {[Cu2(TBA)]·2H2O}n and Dinuclear [Cu2(TBA)(H2O)2]·2H2O Complexes Based on in Situ Tetramerization of DMBA

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Pressure-Dependent Pseudo-Polymorphism of Polymeric {[Cu₂(TBA)]·2H₂O}_n and Dinuclear [Cu₂(TBA)(H₂O)₂]·2H₂O Complexes Based on in Situ Tetramerization of DMBA