Home Crystal structure of dichlorido-(μ2-2,2′-(diazene-1,2-diyl)bis(benzen-1-ido)-κ2C:C′)dimercury(II), C12H8Cl2Hg2N2
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Crystal structure of dichlorido-(μ2-2,2′-(diazene-1,2-diyl)bis(benzen-1-ido)-κ2C:C′)dimercury(II), C12H8Cl2Hg2N2

  • Ying Zhao EMAIL logo
Published/Copyright: May 14, 2019

Abstract

C12H8Cl2Hg2N2, triclinic, P1̄ (no. 2), a = 3.9815(8) Å, b = 8.9837(18) Å, c = 9.755(2) Å, α = 102.10(3)°, β = 99.54(3)°, γ = 98.82(3)°, V = 329.98(12) Å3, Z = 1, Rgt(F) = 0.0368, wRref(F2) = 0.1061, T = 296(2) K.

CCDC no.: 1905418

The title complex is shown in the figure. Table 1 contains crystallographic data and Table 2 contains the list of the atoms including atomic coordinates and displacement parameters.

Source of material

A mixture of 2,2′-azodibenzoic acid (6.8 mg, 0.025 mmol), NaOH (13.6 mg, 0.025 mol/L) and HgCl2 (13.6 mg, 0.05 mmol) dissolved in CH3OH (4 mL) were placed in a Teflon-lined stainless steel vessel, heated to 393 K for 3 days, and then cooled to room temperature over 24 h. Crystals of 1 were obtained.

Table 1:

Data collection and handling.

Crystal:Orange block
Size:0.25 × 0.10 × 0.05 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:23.6 mm−1
Diffractometer, scan mode:Bruker APEX-II, φ and ω
θmax, completeness:25.0°, >99%
N(hkl)measured, N(hkl)unique, Rint:2145, 1160, 0.035
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1068
N(param)refined:82
Programs:Bruker [1], SHELX [2], [3]
Table 2:

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2).

AtomxyzUiso*/Ueq
Hg10.12404(9)0.47083(5)0.20380(3)0.0343(2)
Cl1−0.1617(8)0.6634(4)0.1469(3)0.0444(7)
C10.529(3)0.3114(13)0.3996(11)0.030(2)
C20.350(3)0.2929(13)0.2576(11)0.030(2)
C30.332(3)0.1536(14)0.1617(11)0.039(3)
H30.21960.13930.06700.046*
C40.474(3)0.0356(14)0.2017(12)0.040(3)
H40.4562−0.05680.13420.049*
C50.644(3)0.0526(14)0.3420(13)0.041(3)
H50.7362−0.02780.37030.050*
C60.672(3)0.1934(14)0.4384(12)0.039(3)
H60.79080.20810.53220.047*
N10.566(2)0.4459(11)0.5149(8)0.0322(19)

Experimental details

The hydrogen atoms were placed in calculated positions and refined using a riding on attached atoms with isotropic thermal parameters 1.2 times those of their carrier atoms. The Uiso values of the hydrogen atoms of methyl groups and oxygen were set to 1.5Ueq(C, O).

Comment

Organomercurials rarely form isolable adducts with neutral or anionic nucleophiles [4]. However, in the solid state, the mercury center often engages in secondary weak interactions. Thus, inter- and intra-molecular Hg—O, Hg—N, Hg—S and Hg—X (X = halide) interactions are common occurrences in the solid state structures of organomercurials [5]. In these cases, these interactions usually lead to the formation of oligomers or even polymers in which the monomeric units can be connected by weak Hg⋯X (X = halide) interactions [6]. Meanwhile, azobenzene ligands have ability to form covalent bonds and other type of non-covalent interactions such as π–π and C—H⋯π interactions due to the presence of p-conjugated system. Although their importance is well established for biological systems, there is a limited information on their role in organometallic compounds. Until now, some dimetalated complexes of azobenzene with metals such as Ni, Mn, Pd, and Ir have been reported [7], [8], [9], [10]. An X-ray diffraction study of (phenylazophenyl-C,N′)mercury(II) chloride had also been shown it to be dimeric via long Hg—Cl bridging interactions of 3.367 Å in the literature [11]. Here, we carried out the solvothermal reaction of 2,2′-azodibenzoic acid with HgII ion. In this case, the 2,2′-azodibenzoic acid/ 2,2′-azodibenzoate ligand was found to occur the decarboxylation of aromatic carboxylates leading to the simultaneous formation of deprotonated phenylazophenyl components. The title compound and the reported (phenylazophenyl-C,N′)mercury(II) chloride in the literature [11] may be regarded as supramolecular structural isomers in which different space group and arrangement spatial are found. The asymmetric unit of the title structure is composed of one HgII, one half of a phenylazophenyl anion and one coordinated chloride. The decarboxylation cleavage reactions generated acute interest in the activation of C—Hg bonds. The HgII ion is bound to a chloride ion and a carbon atom. The Hg1—C and Hg1—Cl distances are 2.068(11) and 2.322(3) Å, respectively. In this structure a Hg—Cl contact of intermediate length (3.287 Å) is observed; as in the title compound, the Hg—N contact is weak, the distance being 2.710 Å.

References

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Received: 2019-01-30
Accepted: 2019-03-25
Published Online: 2019-05-14
Published in Print: 2019-06-26

© 2019 Ying Zhao, published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 Public License.

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  79. The synthysis and crystal structure of cyclohexyl 5-amino-1-(2,6-dichloro-4-(trifluoromethyl)phenyl)-4-((trifluoromethyl)sulfinyl)-1H-pyrazole-3-carboxylate, C18H15N3Cl2F6O3S
  80. The crystal structure of 5,7-bis(2-hydroxyethoxy)-2-phenyl-4H-chromen-4-one, C19H18O6
  81. Synthesis and crystal structure of (±)-Ethyl 5′-(difluoromethyl)-2-oxo-4′,5′-dihydrospiro[indoline-3,3′-pyrazole]-4′-carboxylate, C14H13F2N3O3
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