Mercury(II) cyanide complexes of thioureas and the crystal structure of [(N-methylthiourea)2 Hg(CN)2]

Isab, Anvarhusein A.; Fettouhi, Mohammed; Malik, Muhammad Riaz; Ali, Sajid; Fazal, Atif; Ahmad, Saeed

doi:10.1134/s1070328411030055

Cited by 18 publications

(7 citation statements)

References 30 publications

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“…The thiourea ligands behave as Sdonors and bind in a terminal mode although the bridging mode has also been observed in some other metal-thioureas systems [33]. The Hg-S and Hg-C bond distances and most of the bond angle values are in agreement with those observed in the other reported complexes [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]34]. The Hg-C distance in 1 (2.065(6) Å) is found to be somewhat longer than that in 2 (2.055(14) Å and 2.062(15) Å).…”

Section: Resultssupporting

confidence: 84%

Crystal structures of [Hg(N-ethylthiourea)2(CN)2] and [Hg(N-propylthiourea)2(CN)2]

Sadaf

Ahmad

Sharif³

et al. 2012

J Struct Chem

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Two mercury(II) cyanide complexes of N-ethylthiourea (Ettu) and N-propylthiourea (Prtu) ligands, [Hg(Ettu) 2 (CN) 2 ] (1) and [Hg(Prtu) 2 (CN) 2 ] (2), were prepared and their crystal structures were determined by X-ray crystallography. In both structures, the mercury atom is coordinated to two sulfur atoms of thioureas and two cyanide carbon atoms in a pseudo-tetrahedral mode with the bond angles in the range of 90.52(11)-162.2(3)°. The structures are stabilized by N-H---S, N-H---N, and C-H---N intramolecular and intermolecular hydrogen bonds. Crystallographic reports about mercury(II) complexes containing thioamides establish that these ligands are coordinated via the sulfur atom [1-26]. The crystal structures of the 1:2 complexes usually consist of discrete monomeric molecules [1-20], while those of 1:1 often involve dimeric species [20-26]. However, in both types of complexes, mercury(II) exhibits a tetrahedral or pseudo-tetrahedral coordination environment. We have recently reported the crystal structures of Hg(CN) 2 complexes of methylthiourea (Metu) [7], N,N′-diethylthiourea (Dintu) [8], N,N′-dibutylthiourea (Dbtu) [9], and tetramethylthiourea (Tmtu) [27]. Although the structures of other thiourea complexes are usually of the type L 2 HgX 2 [7-9], the Tmtu complex, [{(tetramethylthiourea) 2 Hg(CN) 2 } 2 ⋅Hg(CN) 2 ] is trinuclear consisting of two independent [(Tmtu) 2 Hg(CN) 2 ] moieties bridged by a Hg(CN) 2 unit [27]. In order to investigate further about the structures of mercury cyanide complexes, we report here the crystal structures of two monomeric Hg(CN) 2 complexes: bis(cyanido)bis(Nethylthiourea-κS)mercury(II), [Hg(Ettu) 2 (CN) 2 ] (1) and bis(cyanido)bis(N-propylthiourea-κS)mercury(II), [Hg(Prtu) 2 (CN) 2 ](2), which are characterized by extensive hydrogen bonding.

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Section: Resultssupporting

confidence: 84%

Crystal structures of [Hg(N-ethylthiourea)2(CN)2] and [Hg(N-propylthiourea)2(CN)2]

Sadaf

Ahmad

Sharif³

et al. 2012

J Struct Chem

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“…Whereas, no signal was observed for [Au(cis-DACH) 2 ]Cl 3 at the same conditions. Figure 1A 13 C-15 N coupling, which is in accordance with previously reported data [43]. The 13 C chemical shifts of different species in the interaction progress are shown in Table S1 of the Supporting Information.…”

Section: Interaction Of [Au(cis-dach)cl 2 ]Cl and [Au(cis-dach) 2 ]Clsupporting

confidence: 90%

Spectroscopic and Electrochemical Studies of the Interaction of Some Gold(III) Complexes with Biologically Relevant Thiones

Sulaiman

Omer

Kawde

et al. 2018

Int J of Chemical Kinetics

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The interaction of gold(III) complexes, [Au(cis‐DACH)Cl2]Cl and [Au(cis‐DACH)2]Cl3 complexes (DACH = cis‐1,2‐diaminocyclohexane), with 13C, 15N‐enriched thiourea (Tu) and 1,3‐diazinane‐2‐thione ligands was investigated. The progress of these reactions was monitored by NMR (1H, 13C, and 15N) and UV–vis spectroscopy as well as square wave stripping voltammetry. The kinetic studies of the substitution reactions between the above‐mentioned complexes with thiones in aqueous solutions containing 30 mM KCl, which is used to suppress the hydrolysis of the chloride complexes, were conducted. These reactions were followed under pseudo–first‐order conditions as functions of ligand concentration, pH, and temperature. The activation parameters (ΔH#, ΔS#) were calculated from Eyring plots, and the negative values of ΔS≠ lend support for an associative mechanism. The kinetic data also indicated a relatively higher reactivity of [Au(cis‐DACH)Cl2]Cl than that of [Au(cis‐DACH)2]Cl3 toward the thiones.

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“…At 102.47 (4) , the Cl-Hg-Cl bond angle is significantly smaller, which can be attributed to the bulkier Dmtu ligands. The Hg-S, Hg-Cl and other bond lengths (Table 1) have similar values compared with other [HgCl 2 L 2 ] complexes (Ahmad et al, 2009;Isab et al, 2011;Malik et al, 2010a;Mufakkar et al, 2010;Popović et al, 2000). In (I), the N-(C S)-N skeleton of the Dmtu ligand is essentially planar with an r.m.s.…”

Section: Structural Commentssupporting

confidence: 56%

“…In both types of complexes, monomeric (1:2) or polymeric (1:1), the coordination environment around Hg II is distorted tetrahedral or pseudo-tetrahedral. We have recently reported the crystal structures of HgCl 2 and Hg(CN) 2 complexes with methylthiourea as an auxiliary ligand (Isab et al, 2011), N,N 0 -dimethylthiourea (Malik et al, 2010a), N,N 0 -diethylthiourea (Mufakkar et al, 2010), N,N 0 -dibutylthiourea (Ahmad et al, 2009) and tetramethylthiourea (Nawaz et al, 2010).…”

Section: Chemical Contextmentioning

confidence: 99%

Crystal structure of dichloridobis(N,N′-dimethylthiourea-κS)mercury(II)

et al. 2015

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Mercury(II) cyanide complexes of thioureas and the crystal structure of [(N-methylthiourea)2 Hg(CN)2]

Cited by 18 publications

References 30 publications

Crystal structures of [Hg(N-ethylthiourea)2(CN)2] and [Hg(N-propylthiourea)2(CN)2]

Crystal structures of [Hg(N-ethylthiourea)2(CN)2] and [Hg(N-propylthiourea)2(CN)2]

Spectroscopic and Electrochemical Studies of the Interaction of Some Gold(III) Complexes with Biologically Relevant Thiones

Crystal structure of dichloridobis(N,N′-dimethylthiourea-κS)mercury(II)

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