metal-organic compounds
1,1′-[(Biphenyl-4,4′-diyl)bis(methylene)]di-1H-imidazol-3-ium tetrachloridomercurate(II)
aCollege of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, People's Republic of China, and bEngineering Research Center of Pesticides of Heilongjiang University, Heilongjiang University, Harbin 150050, People's Republic of China
*Correspondence e-mail: hgf1000@163.com
In the title compound, (C20H20N4)[HgCl4], the HgII ion is four-coordinated in a tetrahedral environment defined by four chloride ions. The dihedral angle between the two phenyl rings is 32.83 (15)°. The protonated 1,1′-[(biphenyl-4,4′-diyl)bis(methylene)]di-1H-imidazol-3-ium cations, showing a cis conformation, link the [HgCl4]2− anions into an R44(42) motif via N—H⋯Cl hydrogen bonds.
Experimental
Crystal data
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Refinement
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Data collection: RAPID-AUTO (Rigaku, 1998); cell RAPID-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1999); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).
Supporting information
https://doi.org/10.1107/S1600536811047374/hy2485sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811047374/hy2485Isup2.hkl
The 4,4'-(dimethylenebiphenyl)diimidazol ligand was synthesized as the literature method (Zhu et al., 2002). HgCl2 (0.140 g, 0.5 mmol) and the ligand (0.160 g, 0.5 mmol) were dissolved in 10 ml ethanol under stirring to get white deposit. 1M HCl solution had been dropped to adjust the pH value until the deposit dissolved. The obtained solution was allowed to stand for several days. Colorless crystals of the title compound were obtained (yield: 28%) as salt-type adducts of the protonated ligand and [HgCl4]2- anion.
H atoms bound to C atoms were placed in calculated positions and treated as riding on their parent atoms, with C—H = 0.93 (aromatic) and 0.97 (methylene) Å and with Uiso(H) = 1.2Ueq(C). N-bound H atoms were located in a differece Fourier map and refined with a restraint of N—H = 0.90 (1) Å and Uiso(H) = 1.5Ueq(N).
N-containing ligands with an arene center have been widely used as building blocks for constructing inorganic-organic supramolecular architectures. The title compound was synthesized at a low pH value condition, as an unexpected product during the process of preparing the ligand–Hg complex. Herein, we report its structure.
In the title compound, the HgII ion is four-coordinated in a tetrahedral environment defined by four Cl ions (Fig. 1). The protonated ligand shows a
conformation, which links the [HgCl4]2- anions, forming a R44(42) motif via N—H···Cl hydrogen bonds (Fig. 2, Table 1).For the synthesis of the ligand, see: Zhu et al. (2002).
Data collection: RAPID-AUTO (Rigaku, 1998); cell
RAPID-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1999); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. The molecular structure of the title compound, showing displacement ellipsoids at the 50% probability level. | |
Fig. 2. A partial packing view, showing the hydrogen-bonded R44(42) motif. |
(C20H20N4)[HgCl4] | F(000) = 1264 |
Mr = 658.79 | Dx = 1.898 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 15195 reflections |
a = 8.9318 (18) Å | θ = 3.3–27.5° |
b = 15.347 (3) Å | µ = 7.15 mm−1 |
c = 16.840 (3) Å | T = 293 K |
β = 92.62 (3)° | Block, colorless |
V = 2306.0 (8) Å3 | 0.24 × 0.23 × 0.22 mm |
Z = 4 |
Rigaku R-AXIS RAPID diffractometer | 5260 independent reflections |
Radiation source: rotation anode | 3913 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.046 |
ω scan | θmax = 27.5°, θmin = 3.3° |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | h = −10→11 |
Tmin = 0.280, Tmax = 0.306 | k = −19→18 |
22111 measured reflections | l = −21→21 |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.032 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.068 | w = 1/[σ2(Fo2) + (0.0184P)2 + 2.3484P] where P = (Fo2 + 2Fc2)/3 |
S = 1.03 | (Δ/σ)max < 0.001 |
5260 reflections | Δρmax = 0.98 e Å−3 |
269 parameters | Δρmin = −0.94 e Å−3 |
2 restraints | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.00514 (18) |
(C20H20N4)[HgCl4] | V = 2306.0 (8) Å3 |
Mr = 658.79 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 8.9318 (18) Å | µ = 7.15 mm−1 |
b = 15.347 (3) Å | T = 293 K |
c = 16.840 (3) Å | 0.24 × 0.23 × 0.22 mm |
β = 92.62 (3)° |
Rigaku R-AXIS RAPID diffractometer | 5260 independent reflections |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | 3913 reflections with I > 2σ(I) |
Tmin = 0.280, Tmax = 0.306 | Rint = 0.046 |
22111 measured reflections |
R[F2 > 2σ(F2)] = 0.032 | 2 restraints |
wR(F2) = 0.068 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | Δρmax = 0.98 e Å−3 |
5260 reflections | Δρmin = −0.94 e Å−3 |
269 parameters |
x | y | z | Uiso*/Ueq | ||
C1 | 0.1318 (11) | 1.0186 (5) | −0.3528 (4) | 0.117 (3) | |
H1 | 0.0501 | 0.9947 | −0.3813 | 0.140* | |
C2 | 0.1321 (6) | 1.0519 (4) | −0.2798 (3) | 0.0855 (17) | |
H2 | 0.0506 | 1.0551 | −0.2474 | 0.103* | |
C3 | 0.3553 (6) | 1.0636 (3) | −0.3221 (3) | 0.0712 (14) | |
H3 | 0.4566 | 1.0765 | −0.3252 | 0.085* | |
C4 | 0.3225 (6) | 1.1204 (3) | −0.1864 (3) | 0.0621 (12) | |
H4A | 0.2678 | 1.1743 | −0.1795 | 0.074* | |
H4B | 0.4280 | 1.1347 | −0.1883 | 0.074* | |
C5 | 0.2996 (5) | 1.0618 (3) | −0.1164 (2) | 0.0489 (9) | |
C6 | 0.3775 (5) | 0.9845 (3) | −0.1082 (2) | 0.0494 (10) | |
H6 | 0.4405 | 0.9672 | −0.1478 | 0.059* | |
C7 | 0.3633 (4) | 0.9323 (2) | −0.0421 (2) | 0.0433 (9) | |
H7 | 0.4160 | 0.8801 | −0.0379 | 0.052* | |
C8 | 0.2708 (4) | 0.9572 (2) | 0.0182 (2) | 0.0395 (8) | |
C9 | 0.1902 (5) | 1.0336 (3) | 0.0087 (2) | 0.0517 (10) | |
H9 | 0.1257 | 1.0506 | 0.0476 | 0.062* | |
C10 | 0.2040 (5) | 1.0850 (3) | −0.0577 (3) | 0.0571 (11) | |
H10 | 0.1482 | 1.1360 | −0.0631 | 0.068* | |
C11 | 0.2651 (4) | 0.9048 (3) | 0.0920 (2) | 0.0409 (8) | |
C12 | 0.2847 (4) | 0.8145 (3) | 0.0914 (2) | 0.0481 (9) | |
H12 | 0.2986 | 0.7860 | 0.0435 | 0.058* | |
C13 | 0.2837 (4) | 0.7670 (3) | 0.1610 (3) | 0.0543 (11) | |
H13 | 0.2961 | 0.7069 | 0.1591 | 0.065* | |
C14 | 0.2648 (4) | 0.8067 (3) | 0.2333 (3) | 0.0555 (11) | |
C15 | 0.2461 (5) | 0.8959 (3) | 0.2345 (3) | 0.0575 (11) | |
H15 | 0.2340 | 0.9241 | 0.2827 | 0.069* | |
C16 | 0.2449 (4) | 0.9439 (3) | 0.1652 (2) | 0.0507 (10) | |
H16 | 0.2303 | 1.0039 | 0.1674 | 0.061* | |
C17 | 0.2680 (5) | 0.7536 (4) | 0.3091 (3) | 0.0738 (15) | |
H17A | 0.3061 | 0.6957 | 0.2986 | 0.089* | |
H17B | 0.3351 | 0.7809 | 0.3486 | 0.089* | |
C18 | −0.0065 (5) | 0.7105 (3) | 0.3035 (3) | 0.0578 (11) | |
H18 | −0.0115 | 0.6846 | 0.2535 | 0.069* | |
C19 | −0.1192 (6) | 0.7189 (3) | 0.3521 (3) | 0.0702 (13) | |
H19 | −0.2171 | 0.6996 | 0.3425 | 0.084* | |
C20 | 0.0762 (7) | 0.7775 (3) | 0.4100 (3) | 0.0679 (14) | |
H20 | 0.1380 | 0.8065 | 0.4472 | 0.082* | |
Cl1 | 0.69235 (14) | 0.46688 (7) | 0.05336 (7) | 0.0659 (3) | |
Cl2 | 0.58278 (14) | 0.62872 (8) | 0.22325 (7) | 0.0724 (3) | |
Cl3 | 0.94394 (12) | 0.67508 (8) | 0.09563 (7) | 0.0640 (3) | |
Cl4 | 0.58329 (12) | 0.71468 (7) | −0.02401 (7) | 0.0606 (3) | |
Hg1 | 0.67130 (2) | 0.626552 (12) | 0.089746 (11) | 0.06180 (9) | |
N1 | 0.2722 (4) | 1.0801 (2) | −0.26138 (18) | 0.0456 (7) | |
N2 | 0.2709 (9) | 1.0261 (3) | −0.3772 (3) | 0.1021 (19) | |
H21 | 0.294 (8) | 1.011 (5) | −0.4267 (18) | 0.153* | |
N3 | 0.1169 (4) | 0.7466 (2) | 0.34045 (19) | 0.0512 (8) | |
N4 | −0.0658 (6) | 0.7599 (3) | 0.4169 (3) | 0.0741 (12) | |
H41 | −0.116 (6) | 0.772 (4) | 0.461 (2) | 0.111* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.172 (8) | 0.099 (5) | 0.073 (5) | −0.059 (5) | −0.052 (5) | 0.018 (4) |
C2 | 0.072 (3) | 0.117 (5) | 0.067 (4) | −0.037 (3) | −0.011 (3) | 0.019 (3) |
C3 | 0.084 (3) | 0.083 (3) | 0.049 (3) | 0.012 (3) | 0.018 (3) | 0.015 (3) |
C4 | 0.088 (3) | 0.055 (2) | 0.043 (2) | −0.022 (2) | −0.006 (2) | 0.005 (2) |
C5 | 0.065 (3) | 0.047 (2) | 0.035 (2) | −0.010 (2) | −0.0025 (18) | 0.0011 (17) |
C6 | 0.058 (2) | 0.059 (2) | 0.032 (2) | −0.003 (2) | 0.0072 (18) | −0.0039 (18) |
C7 | 0.055 (2) | 0.0415 (19) | 0.033 (2) | 0.0007 (18) | 0.0055 (17) | −0.0010 (16) |
C8 | 0.0410 (19) | 0.047 (2) | 0.0307 (19) | −0.0056 (17) | −0.0004 (15) | −0.0031 (16) |
C9 | 0.061 (2) | 0.054 (2) | 0.040 (2) | 0.004 (2) | 0.0092 (19) | −0.0026 (19) |
C10 | 0.079 (3) | 0.044 (2) | 0.049 (3) | 0.008 (2) | −0.001 (2) | 0.0016 (19) |
C11 | 0.0353 (18) | 0.051 (2) | 0.036 (2) | −0.0043 (17) | 0.0016 (15) | 0.0027 (17) |
C12 | 0.048 (2) | 0.054 (2) | 0.042 (2) | −0.0058 (19) | 0.0026 (17) | −0.0002 (19) |
C13 | 0.047 (2) | 0.049 (2) | 0.066 (3) | −0.0046 (19) | −0.003 (2) | 0.015 (2) |
C14 | 0.038 (2) | 0.083 (3) | 0.046 (3) | −0.003 (2) | 0.0025 (18) | 0.019 (2) |
C15 | 0.053 (2) | 0.084 (3) | 0.036 (2) | −0.005 (2) | 0.0055 (18) | 0.004 (2) |
C16 | 0.054 (2) | 0.061 (2) | 0.038 (2) | −0.003 (2) | 0.0090 (18) | −0.0001 (19) |
C17 | 0.054 (3) | 0.104 (4) | 0.063 (3) | −0.001 (3) | 0.002 (2) | 0.037 (3) |
C18 | 0.070 (3) | 0.064 (3) | 0.039 (2) | −0.009 (2) | 0.004 (2) | −0.001 (2) |
C19 | 0.070 (3) | 0.072 (3) | 0.070 (4) | −0.009 (3) | 0.021 (3) | 0.015 (3) |
C20 | 0.115 (4) | 0.053 (3) | 0.035 (2) | −0.015 (3) | −0.012 (3) | 0.006 (2) |
Cl1 | 0.0927 (8) | 0.0514 (6) | 0.0534 (7) | 0.0033 (6) | 0.0018 (6) | 0.0077 (5) |
Cl2 | 0.0760 (7) | 0.0845 (8) | 0.0583 (7) | 0.0128 (7) | 0.0199 (6) | 0.0173 (6) |
Cl3 | 0.0560 (6) | 0.0860 (8) | 0.0501 (6) | −0.0079 (6) | 0.0026 (5) | 0.0116 (6) |
Cl4 | 0.0604 (6) | 0.0569 (6) | 0.0644 (7) | 0.0064 (5) | 0.0020 (5) | 0.0076 (5) |
Hg1 | 0.06837 (13) | 0.05743 (12) | 0.06077 (13) | −0.00271 (9) | 0.01554 (9) | 0.00682 (9) |
N1 | 0.0541 (19) | 0.0468 (18) | 0.0357 (18) | −0.0079 (16) | 0.0010 (15) | 0.0042 (14) |
N2 | 0.198 (6) | 0.069 (3) | 0.038 (3) | 0.018 (4) | 0.000 (4) | −0.001 (2) |
N3 | 0.060 (2) | 0.064 (2) | 0.0296 (18) | −0.0103 (17) | 0.0025 (15) | 0.0118 (16) |
N4 | 0.106 (4) | 0.066 (3) | 0.053 (3) | 0.000 (3) | 0.034 (2) | 0.011 (2) |
C1—N2 | 1.332 (9) | C12—H12 | 0.9300 |
C1—C2 | 1.332 (9) | C13—C14 | 1.379 (6) |
C1—H1 | 0.9300 | C13—H13 | 0.9300 |
C2—N1 | 1.346 (6) | C14—C15 | 1.379 (6) |
C2—H2 | 0.9300 | C14—C17 | 1.513 (6) |
C3—N2 | 1.302 (8) | C15—C16 | 1.381 (6) |
C3—N1 | 1.316 (5) | C15—H15 | 0.9300 |
C3—H3 | 0.9300 | C16—H16 | 0.9300 |
C4—N1 | 1.459 (5) | C17—N3 | 1.476 (5) |
C4—C5 | 1.504 (5) | C17—H17A | 0.9700 |
C4—H4A | 0.9700 | C17—H17B | 0.9700 |
C4—H4B | 0.9700 | C18—C19 | 1.332 (6) |
C5—C6 | 1.379 (6) | C18—N3 | 1.359 (5) |
C5—C10 | 1.383 (6) | C18—H18 | 0.9300 |
C6—C7 | 1.382 (5) | C19—N4 | 1.329 (7) |
C6—H6 | 0.9300 | C19—H19 | 0.9300 |
C7—C8 | 1.391 (5) | C20—N4 | 1.307 (7) |
C7—H7 | 0.9300 | C20—N3 | 1.329 (5) |
C8—C9 | 1.382 (5) | C20—H20 | 0.9300 |
C8—C11 | 1.484 (5) | Cl1—Hg1 | 2.5350 (12) |
C9—C10 | 1.378 (6) | Cl2—Hg1 | 2.4173 (13) |
C9—H9 | 0.9300 | Cl3—Hg1 | 2.5441 (12) |
C10—H10 | 0.9300 | Cl4—Hg1 | 2.4452 (12) |
C11—C16 | 1.389 (5) | N2—H21 | 0.90 (1) |
C11—C12 | 1.398 (6) | N4—H41 | 0.90 (1) |
C12—C13 | 1.380 (5) | ||
N2—C1—C2 | 106.8 (6) | C15—C14—C13 | 118.1 (4) |
N2—C1—H1 | 126.6 | C15—C14—C17 | 121.4 (4) |
C2—C1—H1 | 126.6 | C13—C14—C17 | 120.5 (4) |
C1—C2—N1 | 107.4 (6) | C14—C15—C16 | 120.9 (4) |
C1—C2—H2 | 126.3 | C14—C15—H15 | 119.5 |
N1—C2—H2 | 126.3 | C16—C15—H15 | 119.5 |
N2—C3—N1 | 108.1 (5) | C15—C16—C11 | 121.5 (4) |
N2—C3—H3 | 126.0 | C15—C16—H16 | 119.3 |
N1—C3—H3 | 126.0 | C11—C16—H16 | 119.3 |
N1—C4—C5 | 112.1 (3) | N3—C17—C14 | 111.0 (4) |
N1—C4—H4A | 109.2 | N3—C17—H17A | 109.4 |
C5—C4—H4A | 109.2 | C14—C17—H17A | 109.4 |
N1—C4—H4B | 109.2 | N3—C17—H17B | 109.4 |
C5—C4—H4B | 109.2 | C14—C17—H17B | 109.4 |
H4A—C4—H4B | 107.9 | H17A—C17—H17B | 108.0 |
C6—C5—C10 | 118.4 (4) | C19—C18—N3 | 107.4 (4) |
C6—C5—C4 | 120.5 (4) | C19—C18—H18 | 126.3 |
C10—C5—C4 | 121.1 (4) | N3—C18—H18 | 126.3 |
C5—C6—C7 | 121.0 (4) | N4—C19—C18 | 107.3 (5) |
C5—C6—H6 | 119.5 | N4—C19—H19 | 126.3 |
C7—C6—H6 | 119.5 | C18—C19—H19 | 126.3 |
C6—C7—C8 | 120.6 (4) | N4—C20—N3 | 108.1 (4) |
C6—C7—H7 | 119.7 | N4—C20—H20 | 126.0 |
C8—C7—H7 | 119.7 | N3—C20—H20 | 126.0 |
C9—C8—C7 | 118.2 (3) | Cl2—Hg1—Cl4 | 127.87 (4) |
C9—C8—C11 | 121.3 (3) | Cl2—Hg1—Cl1 | 105.61 (4) |
C7—C8—C11 | 120.5 (3) | Cl4—Hg1—Cl1 | 111.72 (4) |
C10—C9—C8 | 121.0 (4) | Cl2—Hg1—Cl3 | 108.24 (5) |
C10—C9—H9 | 119.5 | Cl4—Hg1—Cl3 | 98.13 (4) |
C8—C9—H9 | 119.5 | Cl1—Hg1—Cl3 | 102.18 (4) |
C9—C10—C5 | 120.9 (4) | C3—N1—C2 | 108.1 (4) |
C9—C10—H10 | 119.5 | C3—N1—C4 | 126.3 (4) |
C5—C10—H10 | 119.5 | C2—N1—C4 | 125.6 (4) |
C16—C11—C12 | 117.2 (4) | C3—N2—C1 | 109.7 (5) |
C16—C11—C8 | 121.3 (3) | C3—N2—H21 | 129 (5) |
C12—C11—C8 | 121.5 (3) | C1—N2—H21 | 121 (5) |
C13—C12—C11 | 120.7 (4) | C20—N3—C18 | 107.5 (4) |
C13—C12—H12 | 119.6 | C20—N3—C17 | 125.5 (4) |
C11—C12—H12 | 119.6 | C18—N3—C17 | 127.0 (4) |
C14—C13—C12 | 121.5 (4) | C20—N4—C19 | 109.7 (4) |
C14—C13—H13 | 119.2 | C20—N4—H41 | 123 (4) |
C12—C13—H13 | 119.2 | C19—N4—H41 | 127 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H21···Cl1i | 0.90 (1) | 2.25 (2) | 3.134 (5) | 170 (7) |
N4—H41···Cl3ii | 0.90 (1) | 2.45 (4) | 3.168 (5) | 137 (5) |
Symmetry codes: (i) −x+1, y+1/2, −z−1/2; (ii) x−1, −y+3/2, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | (C20H20N4)[HgCl4] |
Mr | 658.79 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 293 |
a, b, c (Å) | 8.9318 (18), 15.347 (3), 16.840 (3) |
β (°) | 92.62 (3) |
V (Å3) | 2306.0 (8) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 7.15 |
Crystal size (mm) | 0.24 × 0.23 × 0.22 |
Data collection | |
Diffractometer | Rigaku R-AXIS RAPID |
Absorption correction | Multi-scan (ABSCOR; Higashi, 1995) |
Tmin, Tmax | 0.280, 0.306 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 22111, 5260, 3913 |
Rint | 0.046 |
(sin θ/λ)max (Å−1) | 0.649 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.032, 0.068, 1.03 |
No. of reflections | 5260 |
No. of parameters | 269 |
No. of restraints | 2 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.98, −0.94 |
Computer programs: RAPID-AUTO (Rigaku, 1998), CrystalStructure (Rigaku/MSC, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), DIAMOND (Brandenburg, 1999), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H21···Cl1i | 0.90 (1) | 2.245 (18) | 3.134 (5) | 170 (7) |
N4—H41···Cl3ii | 0.90 (1) | 2.45 (4) | 3.168 (5) | 137 (5) |
Symmetry codes: (i) −x+1, y+1/2, −z−1/2; (ii) x−1, −y+3/2, z+1/2. |
Acknowledgements
The authors thank the Project of Innovation Service Platform of Heilongjiang Province (PG09J001) and Heilongjiang University for supporting this work.
References
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Zhu, H.-F., Zhao, W., Okamura, T., Fei, B.-L., Sun, W.-Y. & Ueyama, N. (2002). New J. Chem. 26, 1277–1279. Web of Science CSD CrossRef CAS Google Scholar
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N-containing ligands with an arene center have been widely used as building blocks for constructing inorganic-organic supramolecular architectures. The title compound was synthesized at a low pH value condition, as an unexpected product during the process of preparing the ligand–Hg complex. Herein, we report its structure.
In the title compound, the HgII ion is four-coordinated in a tetrahedral environment defined by four Cl ions (Fig. 1). The protonated ligand shows a cis conformation, which links the [HgCl4]2- anions, forming a R44(42) motif via N—H···Cl hydrogen bonds (Fig. 2, Table 1).