Synthesis and structure of a heptacoordinated cadmium(II) complex

Sen, Sutapa; Saha, Manas Kumar; Kundu, Palash Kumar; Mitra, Samiran; Bruckmann, Joachim

doi:10.1016/s0020-1693(99)00048-1

Cited by 27 publications

(11 citation statements)

References 16 publications

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Section: Discnssioncontrasting

confidence: 57%

“…The Cd-02 distance (2.5753(2) Ä) is significantly longer than other Cd-Ο bond distances (<f(Cd-O) = 2.298(2) Ä -2.4555(2) Ä), indicating that Cd-02 bonding interaction is weaker than other Cd-Ο bonding interactions. The mean Cd-Ο distance (2.4248(9) Ä) is slightly longer than those in the previously reported bidentate chelate carboxylato compound [2].Within the crystal structure, the title compound molecules are held together by weak intermolecular nonclassical C-H-Ο hydrogen-bonding interactions and π-π interactions. The coordinated water molecules functioning as hydrogen-bond donors contribute Η atoms to the acrylato Ο atoms (02 1 ,03 u ) of neighboring complex molecules to form intermolecular hydrogen bonds (rf(05-02') = 2.730 Ä, ^05-115^02' = 163.0°; </(05-03") = 2.731 Ä, Z.05-H5a-03" = 152.0°) (symmetry codes: (i) 'Α-χ,-Ά+γ,'Λ-ζ; (ii) 3 Λ-χ,Ά+γ, 3 Α-ζ).…”

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confidence: 59%

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Crystal structure of aquabis(acrylato-O,O')(1,10-phenanthroline-N,N')-cadmium(II),Cd(H2O)(C3H3O2)2(C12H10N2)

Cai¹,

Jiang²,

Peng³

et al. 2006

Zeitschrift Für Kristallographie - New Crystal Structures

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Ci8HisCdN205, monoclinic, P12\/nl (no. 14), a = 9.9973(5) k,b = 9.0433(4) Ä, c = 19.4849(8) Ä, β = 101.235(2)°, V= 1727.9 Ä 3 , Ζ = 4, Rgi(F) = 0.025, wR tef (F 2 ) = 0.065, T= 273 K. Source of materialThe title complex was prepared analogously to the synthesis of [CdCl(C 3 H302)(Ci2HioN 2 )2] except for the pH of this solution controlled in the range of 8-9 [1]. Freshly prepared precipitate Cd(OH)2, which was obtained from 1.0 ml (1.0 M) NaOH to a * Correspondence author (e-mail: nzy8092@163.com) stirred aqueous solution of CdCh · 6H2O (0.269 g, 1.0 mmol) in 5 ml H2O, was added to a stirred aqueous solution of 1,10-phenanthroline monohydrate (0.198 g, 1.0 mmol) and acrylic acid (0.144 g, 2.0 mmol) in 20 ml IfeO/ethanol (1:1, v/v). The mixture was further stirred for ca. 30 min at room temperature, and the pH of the mixture solution was controlled in the range of 8-9 with 1Μ NaOH solution. The mixture then was further stirred for another 2 h and filtered off and the resultant filtrate was allowed to stand by slow evaporation at room temperature. The colorless blocklike crystals were obtained 30 days later (yield 80 % based on the Cd(OH) 2 input). DiscnssionThe title structure consists of Cd(H20XC3H30 2 )2(Ci2HioN2) complex molecules, where the seven-coordinated Cd atom adopts a distorted monocapped octahedral environment formed by two nitrogen atoms of an 1,10-phenanthroline ligand and five oxygen atoms from one aqua ligand and two acrylato anion groups with the acrylato 02 atom residing at the cap site and the axial apical positions occupied by one aromatic pyridyl atoms (N2) and one acrylato Ο atom (Ol) (figure, top), Tlie equatorial plane sites are defined by one aromatic pyridyl Ν atom (Nl), one aqua ligand (05) and two acrylato Ο atoms (03,04) with the pyridyl Nl atom shifted from the basal plane of 0.9999(3) A. The Cd-N2 length (2.3706(2) Ä) is slightly longer than the Cd-Nl length (2.3676(2) Ä), but shorter than those found in the compound of [CdCl(C3H302)( Ci2HioN 2 )2], where the Cd-Ν distances fall in the range of2.3984(2) Ä-2.5619(2) Ä [1]. The acrylato anion ligands adopt bidentate chelating mode. The Cd-02 distance (2.5753(2) Ä) is significantly longer than other Cd-Ο bond distances (

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Section: Discnssioncontrasting

confidence: 57%

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confidence: 59%

Crystal structure of aquabis(acrylato-O,O')(1,10-phenanthroline-N,N')-cadmium(II),Cd(H2O)(C3H3O2)2(C12H10N2)

Cai¹,

Jiang²,

Peng³

et al. 2006

Zeitschrift Für Kristallographie - New Crystal Structures

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“…The CdO2 distance (2.5753(2) Å) is significantly longer than other CdO bond distances (d(CdO) = 2.298(2) Å 2.4555(2) Å), indicating that CdO2 bonding interaction is weaker than other CdO bonding interactions. The mean CdO distance (2.4248(9) Å) is slightly longer than those in the previously reported bidentate chelate carboxylato compound [2]. Within the crystal structure, the title compound molecules are held together by weak intermolecular nonclassical CH···O hydrogen-bonding interactions and p-p interactions.…”

Section: Discussionmentioning

confidence: 59%

Crystal structure of aquabis(acrylato-O,O')(1,10-phenanthroline-N,N′)- cadmium(II), Cd(H2O)(C3H3O2)2(C12H10N2)

Cai

Jiang

Peng

et al. 2006

Zeitschrift Für Kristallographie - New Crystal Structures

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C18H15CdN2O5, monoclinic, P121/n1 (no. 14), a = 9.9973(5) Å, b = 9.0433(4) Å, c = 19.4849(8) Å, b = 101.235(2)°, V = 1727.9 Å 3 , Z = 4, Rgt(F) = 0.025, wRref(F 2 ) = 0.065, T = 273 K. Source of materialThe title complex was prepared analogously to the synthesis of [CdCl(C3H3O2)(C12H10N2)2] except for the pH of this solution controlled in the range of 8-9 [1]. Freshly prepared precipitate Cd(OH)2, which was obtained from 1.0 ml (1.0 M) NaOH to a stirred aqueous solution of CdCl 2 · 6H2O (0.269 g, 1.0 mmol) in 5 ml H2O, was added to a stirred aqueous solution of 1,10-phenanthroline monohydrate (0.198 g, 1.0 mmol) and acrylic acid (0.144 g, 2.0 mmol) in 20 ml H2O/ethanol (1:1, v/v) . The mixture was further stirred for ca. 30 min at room temperature, and the pH of the mixture solution was controlled in the range of 8-9 with 1 M NaOH solution. The mixture then was further stirred for another 2 h and filtered off and the resultant filtrate was allowed to stand by slow evaporation at room temperature. The colorless blocklike crystals were obtained 30 days later (yield 80 % based on the Cd(OH)2 input). DiscussionThe title structure consists of Cd(H 2 O)(C 3 H 3 O 2 ) 2 (C 12 H 10 N 2 ) complex molecules, where the seven-coordinated Cd atom adopts a distorted monocapped octahedral environment formed by two nitrogen atoms of an 1,10-phenanthroline ligand and five oxygen atoms from one aqua ligand and two acrylato anion groups with the acrylato O2 atom residing at the cap site and the axial apical positions occupied by one aromatic pyridyl atoms (N2) and one acrylato O atom (O1) (figure, top). The equatorial plane sites are defined by one aromatic pyridyl N atom (N1), one aqua ligand (O5) and two acrylato O atoms (O3, O4) with the pyridyl N1 atom shifted from the basal plane of 0.9999(3) Å. The CdN2 length (2.3706(2) Å) is slightly longer than the CdN1 length (2.3676 (2) direction, the complex molecules are interlinked via the intermolecular hydrogen-bonding interactions into 1D double chains. The resulting chains are further held by p-p interactions between the 1,10-phenanthroline ligands of neighboring double chains into layers parallel to (101) with an average interplanar distance of 3.4522(5) Å (figure, bottom).

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“…The Cd-CI distance and average Cd-Ν bond lengths are 2.5248(8) Ä and 2.4483 A, respectively, being longer than the corresponding values in the dichloro-bis(l,10-phenanthroline)-cadmium compound [1]. The acrylato ligand adopts bidentate chelating mode, and Äe Cd-Ο bond distances (2.4419(2) Ä, 2.5078(2) Ä for Cdl-Ol and Cdl-02, respectively) are slightly longer than those in the previously reported bidentate chelate carboxylato compound [2], The cis bond angles at the central Cd atom from the apical N3 and Q atoms fall in the range of 69.47(5)° -107.54(6)°, and the trans bond angle Z.N3-Cdl-Cl is 164.66(4)°, showing a significant deviation from the value for a perfect pentagonal bipyramid. There is a dihedral angle of 78.91° between the two crystallographically independent 1,10-phenanthroline ligands.…”

Section: Discussionmentioning

confidence: 63%

Crystal structure of chloro(acrylato -O,O')bis(1,10-phenanthroline-N,-N')-cadmium(II),CdCl(C3H3O2)(C12H8N2)2

Cai¹,

Jiang²,

Peng³

et al. 2006

Zeitschrift Für Kristallographie - New Crystal Structures

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Synthesis and structure of a heptacoordinated cadmium(II) complex

Cited by 27 publications

References 16 publications

Crystal structure of aquabis(acrylato-O,O')(1,10-phenanthroline-N,N')-cadmium(II),Cd(H2O)(C3H3O2)2(C12H10N2)

Crystal structure of aquabis(acrylato-O,O')(1,10-phenanthroline-N,N')-cadmium(II),Cd(H2O)(C3H3O2)2(C12H10N2)

Crystal structure of aquabis(acrylato-O,O')(1,10-phenanthroline-N,N′)- cadmium(II), Cd(H2O)(C3H3O2)2(C12H10N2)

Crystal structure of chloro(acrylato -O,O')bis(1,10-phenanthroline-N,-N')-cadmium(II),CdCl(C3H3O2)(C12H8N2)2

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