Bis(4-nitro­phen­yl) selenide

In the title compound, C₁₂H₈N₂O₄Se, the Se atom is situated on a twofold rotational axis, so the asymmetric unit contains one half-mol­ecule. In the mol­ecule, the C—Se—C angle is 99.48 (13)°, the two benzene rings are inclined to each other at an angle of 63.8 (1)° and the nitro group is twisted by 15.9 (1)° from the attached benzene ring. In the crystal, mol­ecules are held together through weak C—H...O inter­actions, forming a three-dimensional network.

Key indicators

• Single-crystal X-ray study
• T = 153 K
• Mean [sigma](C-C) = 0.003 Å
• R factor = 0.030
• wR factor = 0.074
• Data-to-parameter ratio = 17.9

checkCIF/PLATON results

No syntax errors found



Alert level C
PLAT910_ALERT_3_C Missing # of FCF Reflections Below Th(Min) .....          1
PLAT911_ALERT_3_C Missing # FCF Refl Between THmin & STh/L=  0.600          2

Alert level G
PLAT005_ALERT_5_G No _iucr_refine_instructions_details  in the CIF          ?
PLAT912_ALERT_4_G Missing # of FCF Reflections Above STh/L=  0.600          6

   0 ALERT level A = Most likely a serious problem - resolve or explain
   0 ALERT level B = A potentially serious problem, consider carefully
   2 ALERT level C = Check. Ensure it is not caused by an omission or oversight
   2 ALERT level G = General information/check it is not something unexpected

   0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   0 ALERT type 2 Indicator that the structure model may be wrong or deficient
   2 ALERT type 3 Indicator that the structure quality may be low
   1 ALERT type 4 Improvement, methodology, query or suggestion
   1 ALERT type 5 Informative message, check

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S1. Comment

During the past decade, organoselenium compounds have emerged their potential as drug candidates (Nogueira et al., 2004; Mugesh et al., 2001). Organoselenium compounds also exert catalytic role in organic synthesis (Wirth, 1999). Herewith we report the crystal structure of the title compound, (I).

In (I) (Fig. 1), each Se atom is situated on a twofold rotational axis, so asymmetric part contains a half of the molecule. The C—Se—C angle is 99.48 (13)°, that is similar to 99.58 (13)° observed in bis(4-acetylphenyl) selenide (Bouraoui et al., 2011), but different from 106.2 (1)° found in bis(p-tolyl) selenide (Blackmore & Abrahams, 1955). Two benzene rings in (I) are inclined to each other at 63.8 (1)° and each nitro group is twisted at 15.9 (1)° from the attached benzene ring. The crystal packing is stabilized by the weak C—H···O hydrogen bonds (Table 1).

Related literature

For applications of organoselenium compounds, see: Mugesh et al. (2001); Nogueira et al. (2004); Wirth (1999). For details of the synthesis, see: Taniguchi (2005). The crystal structures of the related compounds bis(p-tolyl) selenide and bis(4-acetylphenyl) selenide were reported by Blackmore & Abrahams (1955) and Bouraoui et al. (2011), respectively.

S2. Experimental

The title compound has been synthesized following the procedure proposed by Taniguchi (2005). 1-Iodo-4-nitrobenzene (1.0 mmol), selenium (1.2 mmol), cuprous oxide (0.1 mmol), aluminium (2 mmol), magnesium chloride (0.5 mmol), acetylacetone (0.3 mmol), TBAF (0.2 mmol) and DMF/water (3:1, 1.0 ml) were put into a Teflon septum screw-capped tube and then sealed in the air. The reaction mixture was stirred at 120 °C for 36 h, then cooled to room temperature. Subsequently, the resulting mixture was diluted with ethyl acetate and water, and the combined organic extracts were dried with sodium sulfate anhydrous. After the solvent being removed under reduced pressure, the residue was purified by silica-gel column chromatography to afford the corresponding product. Yellow single crystals suitable for X-ray diffraction were obtained by recrystallization from acetone.

S3. Refinement

H atoms were placed in calculated positions, with C—H = 0.95 Å, and refined using a riding model, with U_iso(H) = 1.2U_eq(C).

Computing details

Data collection: CrystalClear (Rigaku, 2008); cell refinement: CrystalClear (Rigaku, 2008); data reduction: CrystalClear (Rigaku, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures

Fig. 1. The molecular structure of (I) showing 50% probability displacement ellipsoids and the atomic numbering [symmetry code: (A) -x, y, 3/2-z].

Bis(4-nitrophenyl) selenide

Crystal data

C12H8N2O4Se	F(000) = 640
Mr = 323.16	Dx = 1.837 Mg m^−3
Monoclinic, C2/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -C 2yc	Cell parameters from 1957 reflections
a = 7.207 (4) Å	θ = 2.9–29.1°
b = 14.176 (7) Å	µ = 3.23 mm^−1
c = 11.686 (5) Å	T = 153 K
β = 101.870 (7)°	Block, yellow
V = 1168.3 (9) Å^3	0.47 × 0.34 × 0.34 mm
Z = 4

Data collection

Rigaku AFC10/Saturn724+ diffractometer	1557 independent reflections
Radiation source: fine-focus sealed tube	1298 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.036
Detector resolution: 28.5714 pixels mm^-1	θmax = 29.1°, θmin = 3.2°
phi and ω scans	h = −9→9
Absorption correction: multi-scan (CrystalClear; Rigaku, 2008)	k = −19→16
Tmin = 0.314, Tmax = 0.402	l = −15→11
4848 measured reflections

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.030	Hydrogen site location: inferred from neighbouring sites
wR(F^2) = 0.074	H-atom parameters constrained
S = 1.00	w = 1/[σ^2(Fo^2) + (0.0351P)^2 + 0.160P] where P = (Fo^2 + 2Fc^2)/3
1557 reflections	(Δ/σ)max < 0.001
87 parameters	Δρmax = 0.70 e Å^−3
0 restraints	Δρmin = −0.50 e Å^−3

Special details

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Refinement. Refinement of F² against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The threshold expression of F² > σ(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F² are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
Se	0.0000	0.05282 (2)	0.7500	0.02293 (12)
O1	−0.6302 (3)	−0.18522 (11)	0.34112 (15)	0.0281 (4)
O2	−0.5748 (2)	−0.29360 (11)	0.47417 (15)	0.0251 (4)
N1	−0.5486 (3)	−0.21464 (13)	0.43644 (16)	0.0182 (4)
C1	−0.1638 (3)	−0.03449 (14)	0.65264 (19)	0.0162 (4)
C2	−0.2197 (3)	−0.01493 (15)	0.53474 (19)	0.0166 (4)
H2	−0.1711	0.0392	0.5030	0.020*
C3	−0.3464 (3)	−0.07375 (15)	0.4622 (2)	0.0176 (5)
H3	−0.3873	−0.0601	0.3813	0.021*
C4	−0.4114 (3)	−0.15292 (14)	0.51142 (19)	0.0157 (4)
C5	−0.3547 (3)	−0.17464 (16)	0.6281 (2)	0.0195 (5)
H5	−0.3994	−0.2303	0.6588	0.023*
C6	−0.2320 (3)	−0.11472 (15)	0.70005 (19)	0.0198 (5)
H6	−0.1942	−0.1279	0.7812	0.024*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Se	0.02479 (19)	0.01636 (18)	0.0236 (2)	0.000	−0.00441 (13)	0.000
O1	0.0308 (10)	0.0249 (9)	0.0228 (9)	0.0009 (7)	−0.0082 (7)	−0.0017 (7)
O2	0.0284 (10)	0.0164 (8)	0.0296 (10)	−0.0054 (7)	0.0037 (8)	−0.0012 (7)
N1	0.0158 (10)	0.0187 (10)	0.0197 (10)	0.0021 (7)	0.0024 (8)	−0.0048 (7)
C1	0.0145 (10)	0.0153 (11)	0.0180 (11)	0.0013 (8)	0.0016 (8)	−0.0020 (8)
C2	0.0163 (10)	0.0147 (10)	0.0191 (12)	0.0014 (8)	0.0039 (9)	0.0038 (8)
C3	0.0174 (11)	0.0205 (12)	0.0142 (11)	0.0038 (8)	0.0016 (8)	0.0019 (8)
C4	0.0130 (10)	0.0154 (11)	0.0182 (11)	0.0023 (8)	0.0016 (8)	−0.0045 (8)
C5	0.0223 (12)	0.0160 (11)	0.0199 (12)	−0.0010 (9)	0.0038 (9)	0.0031 (8)
C6	0.0245 (12)	0.0205 (12)	0.0134 (11)	−0.0014 (9)	0.0018 (9)	0.0026 (8)

Geometric parameters (Å, º)

Se—C1	1.915 (2)	C2—H2	0.9500
Se—C1^i	1.915 (2)	C3—C4	1.386 (3)
O1—N1	1.221 (2)	C3—H3	0.9500
O2—N1	1.232 (2)	C4—C5	1.375 (3)
N1—C4	1.468 (3)	C5—C6	1.380 (3)
C1—C2	1.382 (3)	C5—H5	0.9500
C1—C6	1.398 (3)	C6—H6	0.9500
C2—C3	1.389 (3)
C1—Se—C1^i	99.48 (13)	C4—C3—H3	121.0
O1—N1—O2	123.79 (19)	C2—C3—H3	121.0
O1—N1—C4	118.68 (18)	C5—C4—C3	122.4 (2)
O2—N1—C4	117.53 (18)	C5—C4—N1	118.99 (19)
C2—C1—C6	120.3 (2)	C3—C4—N1	118.59 (19)
C2—C1—Se	118.71 (16)	C4—C5—C6	119.3 (2)
C6—C1—Se	120.96 (17)	C4—C5—H5	120.4
C1—C2—C3	120.6 (2)	C6—C5—H5	120.4
C1—C2—H2	119.7	C5—C6—C1	119.5 (2)
C3—C2—H2	119.7	C5—C6—H6	120.2
C4—C3—C2	117.9 (2)	C1—C6—H6	120.2
C1^i—Se—C1—C2	−139.8 (2)	O2—N1—C4—C5	−15.9 (3)
C1^i—Se—C1—C6	42.66 (16)	O1—N1—C4—C3	−14.9 (3)
C6—C1—C2—C3	1.0 (3)	O2—N1—C4—C3	165.32 (19)
Se—C1—C2—C3	−176.55 (16)	C3—C4—C5—C6	1.5 (3)
C1—C2—C3—C4	−1.2 (3)	N1—C4—C5—C6	−177.24 (19)
C2—C3—C4—C5	−0.1 (3)	C4—C5—C6—C1	−1.7 (3)
C2—C3—C4—N1	178.67 (18)	C2—C1—C6—C5	0.4 (3)
O1—N1—C4—C5	163.9 (2)	Se—C1—C6—C5	177.94 (17)

Symmetry code: (i) −x, y, −z+3/2.

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
C2—H2···O2^ii	0.95	2.51	3.426 (3)	162
C6—H6···O2^iii	0.95	2.50	3.427 (3)	164

Symmetry codes: (ii) x+1/2, y+1/2, z; (iii) x+1/2, −y−1/2, z+1/2.