Syntheses, structures and luminescence behaviors of mono- and dinuclear complexes of type [M(L)(NCS)2]n [M=Zn/Hg, n=1; M=Cd, n=2; L=(N,N-diethyl,N′-(pyridin-2-yl)benzylidene)ethane-1,2-diamine]: Variation of coordination matrices and nuclearities with the change of congeneric metal ions

Satapathi, Smita; Das, Sunanda; Bhar, Kishalay; Kumar, Ram; Maji, Tapas Kumar; Ghosh, Barindra Kumar

doi:10.1016/j.poly.2010.11.006

Cited by 21 publications

(4 citation statements)

References 40 publications

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“…The occurrence of two strong absorptions at 2081 and 2061 cm –1 for 1 and at 2106 and 2065 cm –1 for 2 are in agreement with the two different coordination modes of the thiocyanate groups in these structures: the higher frequency peaks [2081 ( 1 ) and 2106 cm –1 ( 2 )] are characteristic of the end-to-end thiocyanate, whereas the lower frequency absorptions [2061 ( 1 ) and 2065 cm –1 ( 2 )] are consistent with N -bonded thiocyanate. All these values fall in the range usually observed for polymeric pseudooctahedral [ML 2 (NCS) 2 ] complexes incorporating both terminal and bridging thiocyanate ligands. − For both compounds, the absorptions corresponding to the stretching vibration ν(CS) and to the deformation frequency δ(NCS) appear at 822 and 529 cm –1 respectively.…”

Section: Resultsmentioning

confidence: 63%

Ferromagnetic Coupling Through the End-to-End Thiocyanate Bridge in Cobalt(II) and Nickel(II) Chains

Palion-Gazda

Machura

Lloret

et al. 2015

Crystal Growth & Design

106

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The preparation, spectroscopic characterization, and X-ray crystal structure of two novel one-dimensional compounds of formula [MII(tppz)(NCS)(μ-1,3-NCS)] n [tppz = 2,3,5,6-tetrakis(2-pyridyl)pyrazine and M = Co(1) and Ni (2)] are reported. 1 and 2 are isomorphous compounds, and they crystallize in the P21/n space group. Their structures are made up of zigzag chains of cobalt(II) (1) and nickel(II) ions (2) bridged by single end-to-end thiocyanate groups with a tridentate tppz molecule and a terminally bound thiocyanate-N ligand achieving distorted MN5S octahedral surroundings around each metal center. The main source of the distortion of the ideal octahedron is due to the geometrical constraints issued from the occurrence of two fused five-member chelate rings of the tridentate tppz ligand, the values of the N–M–N bond angles covering the range 75.58(9)–78.66(9)°. The M–N bond lengths vary in the range 2.025(3)–2.116(29 (1) and 2.001(2)–2.079(2) Å (2), and they are shorter than the M–S bond distance [2.6395(10) (1) and 2.5225(9) Å (2)]. The values of the intrachain metal–metal separation are 6.4197(7) (1) and 6.3257(5) Å (2). The magnetic properties of 1 and 2 have been investigated in the temperature range 1.9–300 K. Both compounds exhibit intrachain ferromagnetic interactions with values of the magnetic coupling (J) of +4.60 (1) and +7.82 cm–1 (2) [the spin Hamiltonian being defined as Ĥ = −JΣ i = 1 n–1 Ŝ i Ŝ i+1].

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Section: Resultsmentioning

confidence: 63%

Ferromagnetic Coupling Through the End-to-End Thiocyanate Bridge in Cobalt(II) and Nickel(II) Chains

Palion-Gazda

Machura

Lloret

et al. 2015

Crystal Growth & Design

106

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“…The comparison of bond lengths in the two present complexes indicates that the Hg-N amine bond length in both complexes is shorter than Hg-N imine and moreover, Hg-N imine bond lengths in HgL(SCN) 2 complex (Hg1-N2 ¼ 2.455(14) Å and Hg1-N4 ¼ 2.433(14) Å) are shorter than them values in HgLI 2 complex (Hg-N2 ¼ 2.618(10) Å and Hg-N4 ¼ 2.610(10) Å). These bonds are longer as compared to the ve-coordinated mercury thiocyanate complexes with N-donor Schiff base ligands (2.289(3) Å in C 24 H 26 Hg 2 N 10 S 4 and 2.367(5) in C 20 H 23 HgN 5 S 2 ) 52,54. The Hg-S1 and Hg-S2 bond distances are 2.630(5) and 2.480(5) Å, respectively, and comparable to similar structures 55,56.…”

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confidence: 94%

Structural and computational study of some new nano-structured Hg(ii) compounds: a combined X-ray, Hirshfeld surface and NBO analyses

et al. 2016

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“…5,6 Thiocyanate is an interesting ambidentate coligand due to its ability to coordinate to the metal ion not only in the monodentate manners at one of its terminal atoms but also as a µ1,1 bridge (through sulfur or nitrogen) and µ1,3 bridge (via both). 7 Researches have shown that Group 12 complexes are important in the field of supramolecular chemistry, crystal growth, 8 and materials science. 9 However, cadmium is known to be a human carcinogen 10 and environmental pollutant, and some studies show 11,12 cadmium exposure can lead to genomic instability and inhibition of DNA damage repair.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and structural characterization of Cd(II) complexes with 2-acetylpyridine-aminoguanidine - a novel coordination mode

Radanović

Novaković

Rodić

et al. 2022

JSCS

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The structures of the first two complexes with bidentate coordination of aminoguanidine Schiff base, i.e., 2-acetylpyridine-aminoguanidine (L), are reported. The complex of the formula [Cd2Cl6(HL)2] (1) was obtained in the reaction of warm aqueous solutions of chloride salts of Cd(II), Zn(II), and the ligand, while the reaction of cadmium bromide and the ligand in the presence of deprotonating agent as well as ammonium thiocyanate resulted in the formation of the complex in which Schiff base has both the role of the ligand and the counterion, viz. [HL][Cd(HL)(NCS)2XY]?H2O (2), where X = Cl?/Br?, and Y = Br?/SCN-. The complexes were characterized by IR spectroscopy, elemental analysis, conductometric measurements, and SC-XRD. The unusual bidentate coordination of the Schiff base lead to significant changes in the geometry of this molecule (from almost planar in free form and as a tridentate ligand to twisted as a bidentate ligand). Besides, in complex 1 relatively rare bridging coordination of Cl-anions in octahedral Cd(II) is found, while the crystal structure of complex 2 exhibits substitutional disorder, and contains four different anions: [Cd(HL)(NCS)2Br(SCN)]? (ca. 61 %), [Cd(HL)(NCS)2Cl(SCN)]? (ca. 35 %), [Cd(HL)(NCS)2Br2]? (ca. 3 %), and [Cd(HL)(NCS)2ClBr] ? (ca. 1 %).

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Syntheses, structures and luminescence behaviors of mono- and dinuclear complexes of type [M(L)(NCS)2]n [M=Zn/Hg, n=1; M=Cd, n=2; L=(N,N-diethyl,N′-(pyridin-2-yl)benzylidene)ethane-1,2-diamine]: Variation of coordination matrices and nuclearities with the change of congeneric metal ions

Cited by 21 publications

References 40 publications

Ferromagnetic Coupling Through the End-to-End Thiocyanate Bridge in Cobalt(II) and Nickel(II) Chains

Ferromagnetic Coupling Through the End-to-End Thiocyanate Bridge in Cobalt(II) and Nickel(II) Chains

Structural and computational study of some new nano-structured Hg(ii) compounds: a combined X-ray, Hirshfeld surface and NBO analyses

Synthesis and structural characterization of Cd(II) complexes with 2-acetylpyridine-aminoguanidine - a novel coordination mode

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