Crystal structures of coordination polymers from CaI<sub>2</sub>and proline

Lamberts, Kevin; Englert, Ulli

doi:10.1107/s2056989015009597

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…The linkage of the Cd1 units with Cd2 is constructed by two different bridging coordination mode of the Pip ligands (μ 2 -η 1 :η 1 and a μ 2 -η 2 :η 1 ). It is noteworthy that the Cd1 units are connected between them through a μ 3 -η 2 :η 1 :η 1 coordination mode with which to the best of our knowledge, there is not previously reported references of Cd(II) carboxylates and few examples with Co(II) and Ca(II) − are found in the literature.…”

Section: Resultsmentioning

confidence: 87%

Diverse Structures and Dimensionalities in Zn(II), Cd(II), and Hg(II) Metal Complexes with Piperonylic Acid

Ejarque

Sánchez-Férez

Ayllón

et al. 2019

Crystal Growth & Design

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Reaction of M(MeCO2)2 (M = Zn(II), Cd(II), and Hg(II)) with 1,3-benzodioxole-5-carboxylic acid (HPip) in methanol (MeOH) yields four piperonylate compounds, one of Zn(II) ([Zn(Pip)2(H2O)2] (1c)), two of Cd(II) ([Cd(μ-Pip) 2(H2O)]n (2) and [Cd3(μ-Pip)6(MeOH)2]n (3)), and one of Hg(II) ([Hg(μ-Pip) 2]n (4)). The obtention of compounds 1c and 4 was independent of the M/L ratio. These four compounds were characterized by analytical and spectroscopic techniques. In addition, the thermal stability of 1c, 2, and 4 has been studied, and the structure of all the complexes has been determined by the single crystal X-ray diffraction method. The Zn(II) compound displayed a monomeric structure, while Cd(II) and Hg(II) complexes exhibited three polymeric arrays. The Zn(II) (1c) and Hg(II) (4) centers are four-and eight-coordinated in a tetrahedral or squareantiprism geometry, respectively. Furthermore, the Cd(II) ions are either six-(2) or six-and seven-(3) coordinated in a octahedral or both octahedral and pentagonal bipyramid geometries, respectively. In these compounds, the Pip ligand presents different coordination modes: μ1-η1 (1c); μ2-η1:η1 and μ2-η2:η1 (2); μ2-η1:η1, μ2-η2:η1 and μ3-η2:η1:η1 (3); μ1-η2 and μ2-η2:η1 (4). The extended structures were also analyzed. Their photoluminescence properties have been examined, and the quantum yields have been calculated.

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Section: Resultsmentioning

confidence: 87%

Diverse Structures and Dimensionalities in Zn(II), Cd(II), and Hg(II) Metal Complexes with Piperonylic Acid

Ejarque

Sánchez-Férez

Ayllón

et al. 2019

Crystal Growth & Design

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“…The role of chirality, halide anions and metal cations on the reaction products of metal halides with racemic and enantiopure amino acids as ligands has been highlighted in previous contributions from our group (MnX 2 and proline: Lamberts & Englert, 2012; MnX 2 /CaX 2 and alanine: Lamberts, Mö ller & Englert, 2014; CaX 2 and proline: Lamberts, Porsche et al, 2014; CuCl 2 and proline: Lamberts et al, 2015).…”

Section: Introductionmentioning

confidence: 67%

One- and two-dimensional polymers from proline and calcium bromide

2015

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Reactions of calcium bromide with enantiopure and racemic proline in aqueous solution lead to two solids in which the zwitterionic amino acid acts as a bridging ligand between neighbouring cations. Depending on the chirality of the amino acid, topologically very different products are obtained. With racemic proline, bromide acts as a simple uncoordinated counter-anion for the cationic heterochiral chains in catena-poly[[aquacalcium(II)]-μ-aqua-μ3-DL-proline-μ2-DL-proline], {[Ca(C5H9NO2)2(H2O)2]Br2}n. In agreement with chemical intuition, only carboxylate and aqua O atoms coordinate the alkaline earth cation in a low-symmetry arrangement. In contrast, L-proline affords the two-dimensional network poly[dibromidobis(μ2-L-proline)calcium(II)], [CaBr2(C5H9NO2)2]n, with an unexpected CaBr2 unit in a more regular coordination sphere.

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Coordination Compounds Featuring Non-Toxic Chiral 1,4-Dicarboxylic Acids and Copper(II)

2020

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Six new coordination compounds of copper cations and 1,4-dicarboxylic acids have been synthesized and structurally investigated. Aspartic acid (H2asp), enantiopure, racemic and meso tartaric acid (H2tart), di-para-toluyltartaric acid (H2dptta) and dibenzoyltartaric acid (H2dbta) represent environmentally benign water-soluble proligands which may be deprotonated for oxygen coordination. Chelating ligands such as tetramethylethylenediamine (TMEDA) and 2-aminomethylpyridine (AMPY) efficiently reduce the dimensionality of the target compounds, and additional aqua ligands complete the coordination environments. In this line of argument, the discrete mononuclear complexes [Cu(AMPY)(asp)(H2O)] and [Cu(Hdbta)2(H2O)4] were obtained; for the latter, only a preliminary structure model can be presented which, however, agrees with the powder diffraction pattern of the bulk. From enantiopure and racemic tartaric acid and TMEDA the closely related chain polymers [CuII(H2tart)(TMEDA)(H2O)2)]n were obtained; the racemic compound consists of individual homochiral strands of opposite chirality. The high steric demand of di-para-toluyltartaric acid leads to one-dimensional [Cu(dptta)(EtOH)(H2O)2]n with coordinated ethanol (EtOH) in the distant Jahn–Teller site of the coordination sphere. Cu(II), meso-tartaric acid and TMEDA aggregate to a trinuclear coordination compound [CuII2CuI(H2tart)(Htart)(TMEDA)2]. Its peripheral cations show the expected Jahn–Teller geometry of Cu(II), but the unambiguous assignment of the oxidation state +I for central cation required susceptibility measurements: their results prove the presence of only two and only very weakly interacting divalent cations, separated by a diamagnetic center.

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Crystal structures of coordination polymers from CaI₂and proline

Abstract: Reactions of l- and dl-proline with CaI2 yields two crystalline products. The zwitterionic proline bridges the Ca cations with its carboxylate group in different coordination modes to form one-dimensional coordination polymers.

Cited by 3 publications

References 19 publications

Diverse Structures and Dimensionalities in Zn(II), Cd(II), and Hg(II) Metal Complexes with Piperonylic Acid

Diverse Structures and Dimensionalities in Zn(II), Cd(II), and Hg(II) Metal Complexes with Piperonylic Acid

One- and two-dimensional polymers from proline and calcium bromide

Coordination Compounds Featuring Non-Toxic Chiral 1,4-Dicarboxylic Acids and Copper(II)

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Crystal structures of coordination polymers from CaI2and proline

Abstract: Reactions of l- and dl-proline with CaI2 yields two crystalline products. The zwitterionic proline bridges the Ca cations with its carboxyl­ate group in different coordination modes to form one-dimensional coordination polymers.

Cited by 3 publications

References 19 publications

Diverse Structures and Dimensionalities in Zn(II), Cd(II), and Hg(II) Metal Complexes with Piperonylic Acid

Diverse Structures and Dimensionalities in Zn(II), Cd(II), and Hg(II) Metal Complexes with Piperonylic Acid

One- and two-dimensional polymers from proline and calcium bromide

Coordination Compounds Featuring Non-Toxic Chiral 1,4-Dicarboxylic Acids and Copper(II)

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Crystal structures of coordination polymers from CaI₂and proline

Abstract: Reactions of l- and dl-proline with CaI2 yields two crystalline products. The zwitterionic proline bridges the Ca cations with its carboxylate group in different coordination modes to form one-dimensional coordination polymers.