Synthesis, crystal structure and magnetic properties of two-dimensional malonato-bridged cobalt(<scp>ii</scp>) and nickel(<scp>ii</scp>) compounds

Delgado, Fernando; Hernández-Molina, Marı́a; Sanchiz, Joaquı́n; Ruíz-Pérez, Catalina; Rodrı́guez-Martı́n, Yolanda; López, Trinidad; Lloret, Francesc; Julve, Miguel

doi:10.1039/b403640a

Cited by 104 publications

(36 citation statements)

References 45 publications

(59 reference statements)

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“…In turn, antiferromagnetic interactions have been described for Mn II and Co II systems. [40,36,37] Only one example of a Fe II complex with a syn,anti bridge has been described, but no magnetic data is available. [41] From these results, it can be deduced that the unpaired spins in e g orbitals favor ferromagnetic interactions, whereas those in t 2g orbitals favor stronger antiferromagnetic interactions, with only one unpaired electron in a t 2g orbital being enough to dominate the overall superexchange.…”

Section: Resultsmentioning

confidence: 98%

Chiral Molecular Magnets: Synthesis, Structure, and Magnetic Behavior of the Series [M(L‐tart)] (M = Mn^II, Fe^II, Co^II, Ni^II; L‐tart = (2R,3R)‐(+)‐tartrate)

Coronado

Galán‐Mascarós

Gómez‐García

et al. 2006

Chemistry A European J

118

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A new series of layered magnets with the formula [M(L-tartrate)] (M = Mn(II), Co(II), Fe(II), Ni(II); L-tartrate = (2R,3R)-(+)-tartrate) has been prepared. All of these compounds are isostructural and crystallize in the chiral orthorhombic space group I222, as found by X-ray structure analysis. Their structure consists of a three-dimensional polymeric network in which each metal shows distorted octahedral coordination bound to four L-tartrate ligands, two of which chelate through an alcohol and a carboxylate group and the other two bind terminally through a monodentate carboxylate group. The chirality of the ligand imposes a Delta conformation on all metal centers. Magnetically, the paramagnetic metal centers form pseudotetragonal layers in which each metal is surrounded by four other metals, with syn,anti carboxylate bridges. These salts show intralayer antiferromagnetic or ferromagnetic interactions, depending on the electronic configuration of the metal, and weak interlayer antiferromagnetic interaction. In all cases the magnetic properties are strongly affected by the anisotropy of the system, and the presence of magnetic canting has been found. The Mn derivative behaves as a weak ferromagnet with a critical temperature of 3.3 K. The Ni derivative shows very unusual magnetic behavior in that it exhibits antiferromagnetic ordering below 6 K, the onset of spontaneous magnetization arising from spin reorientation into a canted phase below 4.5 K, and a field-induced ferromagnetic state above 0.3 T at 2 K, behavior typical of metamagnets. The Fe and Co derivatives show antiferromagnetic interactions between spin carriers, but do not order above 2 K.

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Section: Resultsmentioning

confidence: 98%

Chiral Molecular Magnets: Synthesis, Structure, and Magnetic Behavior of the Series [M(L‐tart)] (M = Mn^II, Fe^II, Co^II, Ni^II; L‐tart = (2R,3R)‐(+)‐tartrate)

Coronado

Galán‐Mascarós

Gómez‐García

et al. 2006

Chemistry A European J

118

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“…This type of carboxylate bridge occurs as complementing mode [2,27] to chelating mode of carboxylate binding, associated with parent carboxylic unit to another metal ion. Two other manganese ions at the two ends of the trinuclear manganese complex are symmetric to each other and both has distorted octahedral environment.…”

Section: Resultsmentioning

confidence: 99%

“…Comparison of structure of complexes prepared through solution route or some other related methods is essential to understand nucleation process. It is necessary to choose ligand that has versatility to form different types of metal complexes [27][28][29][30][31][32][33]. There is vast literature on mononuclear and polynuclear metal carboxylate complexes [13][14][15][16][17][18][19][20][21][22][23][24][25]34], thus the metal carboxylate complexes would be suitable for such study.…”

Section: Introductionmentioning

confidence: 99%

Manganese and Cadmium Benzoate Complexes Having 8-Aminoquinoline Ancillary Ligand

Baruah¹,

Karmakar²,

Baruah³

2008

TOICJ

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Simple synthetic methods for synthesis of trinuclear manganese(II) benzoate complexes having 8-aminoquinoline as ancillary ligand are reported. The crystal structure of two trinuclear manganese(II) complexes, [Mn 3 (2-NO 2 C 6 H 4 COO) 6 (AQ) 2 ] (I) and [Mn 3 (3-CH 3 C 6 H 4 COO) 6 (AQ) 2 ].NPD (II) is reported (where AQ = 8-aminoquinoline, NPD = 1,5 dihydroxynaphthalene). In solution, the degradation of trinuclear complex I leads to a dinuclear complex [Mn 2 (2-NO 2 C 6 H 4 COO) 4 (AQ) 2 (H 2 O) 2 ] (III) and structure of complex III is reported. A solution phase synthetic method for the synthesis of the dinuclear manganese(II) complex III is also reported. This complex has a Mn 2 O 2 bridge originating from the carboxylate ligand. Synthesis of a cadmium 2-nitrobenzoate co-ordination polymer [Cd(2-NO 2 C 6 H 4 COO) 2 (AQ)] n (IV) having eight co-ordination number is reported and its structure is explained as aggregation of multiple numbers of six coordinated mononuclear cadmium complexes. Keywords:Metal carboxylates, 8-aminoquinoline, manganese trinuclear complexes, cadmium co-ordination polymer. INTRODUCT IONCarboxylate ligands can bind to metal ions in several ways, such as monodentate, bidentate, bridging etc. These binding modes complicate selective synthesis of metal carboxylate complexes [1][2][3][4][5][6][7][8][9][10][11][12]. A general approach to rationalize selective synthetic procedures for polynuclear carboxylate complexes would require extensive structural study on carboxylate complexes prepared via different synthetic routes [13][14][15][16][17][18][19][20][21][22][23][24][25]. Retro-analysis of structures of polynuclear metal complexes provides information on the smallest mononuclear building blocks to form assemblies [26]. Such approach is applied to carboxylate complexes that are prepared through hydrothermal method. Comparison of structure of complexes prepared through solution route or some other related methods is essential to understand nucleation process. It is necessary to choose ligand that has versatility to form different types of metal complexes [27][28][29][30][31][32][33]. There is vast literature on mononuclear and polynuclear metal carboxylate complexes [13][14][15][16][17][18][19][20][21][22][23][24][25]34], thus the metal carboxylate complexes would be suitable for such study. The rationalization of the structural aspect through co-ordination capability of the metal ions can be another approach to standardize synthetic procedures. In this study the synthesis and structures of the trinuclear manganese complexes, and co-ordination polymer of cadmium having 8-aminoquinoline (AQ) are reported. MATERIALS AND METHODS Synthesis and Spectroscopic Properties of Complexes [Mn 3 (2-NO 2 C 6 H 4 COO) 6 (AQ) 2 ] (I)Manganese acetate tetrahydrate (0.245 g, 1 mmol) and 2-nitrobenzoic acid (0.334 g, 2 mmol) were mixed in a mor-*Address correspondence to this author at the Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039 Assam, India; E-mail: juba@iit...

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“…Finally, a point which deserves a brief comment is the fact that the magnetic coupling between the Mn(II) and nickel(II) ions through the carboxylate bridge is antiferro-(1) and ferromagnetic (2). The different electronic configuration of the metal ions involved with five (1) and two (2) unpaired electrons t 2g 3 e g 2 for Mn(II), and t 2g 6 e g 2 for Ni(II), Oh symmetry would account for that [68].…”

Section: Magnetic Property Of Polymers 1 Andmentioning

confidence: 97%

Series of coordination polymers based on 4-(5-sulfo-quinolin-8-yloxy) phthalate and bipyridinyl coligands: Structure diversity and properties

Feng

Liu

Jin

et al. 2015

Journal of Solid State Chemistry

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Synthesis, crystal structure and magnetic properties of two-dimensional malonato-bridged cobalt(ii) and nickel(ii) compounds

Cited by 104 publications

References 45 publications

Chiral Molecular Magnets: Synthesis, Structure, and Magnetic Behavior of the Series [M(L‐tart)] (M = Mn^II, Fe^II, Co^II, Ni^II; L‐tart = (2R,3R)‐(+)‐tartrate)

Chiral Molecular Magnets: Synthesis, Structure, and Magnetic Behavior of the Series [M(L‐tart)] (M = Mn^II, Fe^II, Co^II, Ni^II; L‐tart = (2R,3R)‐(+)‐tartrate)

Manganese and Cadmium Benzoate Complexes Having 8-Aminoquinoline Ancillary Ligand

Series of coordination polymers based on 4-(5-sulfo-quinolin-8-yloxy) phthalate and bipyridinyl coligands: Structure diversity and properties

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Synthesis, crystal structure and magnetic properties of two-dimensional malonato-bridged cobalt(ii) and nickel(ii) compounds

Cited by 104 publications

References 45 publications

Chiral Molecular Magnets: Synthesis, Structure, and Magnetic Behavior of the Series [M(L‐tart)] (M = MnII, FeII, CoII, NiII; L‐tart = (2R,3R)‐(+)‐tartrate)

Chiral Molecular Magnets: Synthesis, Structure, and Magnetic Behavior of the Series [M(L‐tart)] (M = MnII, FeII, CoII, NiII; L‐tart = (2R,3R)‐(+)‐tartrate)

Manganese and Cadmium Benzoate Complexes Having 8-Aminoquinoline Ancillary Ligand

Series of coordination polymers based on 4-(5-sulfo-quinolin-8-yloxy) phthalate and bipyridinyl coligands: Structure diversity and properties

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Chiral Molecular Magnets: Synthesis, Structure, and Magnetic Behavior of the Series [M(L‐tart)] (M = Mn^II, Fe^II, Co^II, Ni^II; L‐tart = (2R,3R)‐(+)‐tartrate)

Chiral Molecular Magnets: Synthesis, Structure, and Magnetic Behavior of the Series [M(L‐tart)] (M = Mn^II, Fe^II, Co^II, Ni^II; L‐tart = (2R,3R)‐(+)‐tartrate)