1,10-Phenanthrolin-1-ium tetra­bromido(1,10-phenanthroline-κ2N,N′)antimonate(III) dichloro­methane solvate

Zhai, J.; Yin, H.; Li, F.; Wang, D.

doi:10.1107/S1600536807060485

1,10-Phenanthrolin-1-ium tetrabromido(1,10-phenanthroline-κ²N,N′)antimonate(III) dichloromethane solvate

In the title compound, (C₁₂H₉N₂)[SbBr₄(C₁₂H₈N₂)]·CH₂Cl₂, the Sb atom is six-coordinated by two N atoms of 1,10-phenanthroline and four Br atoms with a distorted cis-SbN₂Br₄ octahedral geometry. An uncoordinated phenanthrolinium cation interacts with the anion via an N—H

Br hydrogen bond.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807060485/hb2661sup1.cif Contains datablocks I, global
	Structure factor file (CIF format) https://doi.org/10.1107/S1600536807060485/hb2661Isup2.hkl Contains datablock I

CCDC reference: 625468

checkCIF report

Key indicators

Single-crystal X-ray study
T = 298 K
Mean (C-C) = 0.012 Å
R factor = 0.040
wR factor = 0.112
Data-to-parameter ratio = 15.8

checkCIF/PLATON results

No syntax errors found



Alert level B
PLAT232_ALERT_2_B Hirshfeld Test Diff (M-X)  Sb1    -   Br1     ..      15.35 su
PLAT232_ALERT_2_B Hirshfeld Test Diff (M-X)  Sb1    -   Br2     ..      14.51 su
PLAT232_ALERT_2_B Hirshfeld Test Diff (M-X)  Sb1    -   Br3     ..      15.58 su

Alert level C
PLAT042_ALERT_1_C Calc. and Rep. MoietyFormula Strings Differ ....          ?
PLAT062_ALERT_4_C Rescale T(min) & T(max) by .....................       0.95
PLAT232_ALERT_2_C Hirshfeld Test Diff (M-X)  Sb1    -   Br4     ..       8.22 su
PLAT242_ALERT_2_C Check Low       Ueq as Compared to Neighbors for        Sb1
PLAT244_ALERT_4_C Low   'Solvent' Ueq as Compared to Neighbors for        C25
PLAT342_ALERT_3_C Low Bond Precision on C-C Bonds (x 1000) Ang ...         12

Alert level G
PLAT860_ALERT_3_G Note: Number of Least-Squares Restraints .......          9

   0 ALERT level A = In general: serious problem
   3 ALERT level B = Potentially serious problem
   6 ALERT level C = Check and explain
   1 ALERT level G = General alerts; check

   1 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   5 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
   2 ALERT type 4 Improvement, methodology, query or suggestion
   0 ALERT type 5 Informative message, check

Comment top

The adducts of SbF₃ with bi-and tri-dentate nitrogen donors such as 1,10-phenanthroline have been reported (Bertazzi et al., 1983). As a continuation of this work, we report here the synthesis and crystal structure of the title compound, (I), (Fig. 1). In this complex, the antimony atom is six-coordinated by two N atoms of phen and four Br atoms with a distorted cis-SbN₂Br₄ octahedral geometry (Table 1).

The charge on the anion is balanced by a phenanthrolinium cation, which bonds to the anion via an N—H···Br hydrongen bond (Table 2, Fig. 2). A dichloromethane solvent molecule completes the structure.

Related literature top

The corresponding SbF₃ complex with 1,10-phenanthroline was reported by Bertazzi et al. (1983).

Experimental top

Antimony tribromide (180.7 mg, 0.5 mmol) was dissolved in methanol (20 ml) and 1,10-phenanthroline (99.1 mg, 0.5 mmol) was added with stirring at room temperature. The resulting orange–red solution was allowed to react for five hours and was then filtered. Yellow blocks of (I) were obtained by slow evaporation of an ethanol/dichloromethane (1:2 v/v) solution over a period of two weeks (yield 88%. m.p. 430 K). Anal. Calcd (%) for C₂₅H₁₉Br₄C_l2N₄Sb: C 33.82; H 2.16; N 6.31. Found: C 33.94; H 2.05; N 6.45.

Computing details top

Data collection: SMART (Siemens, 1996); cell refinement: SAINT (Siemens, 1996); data reduction: Please give details; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997a); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997a); molecular graphics: SHELXTL (Sheldrick, 1997b); software used to prepare material for publication: SHELXTL (Sheldrick, 1997b).

Figures top

	Fig. 1. The molecular structure of (I), with 50% probability displacement ellipsoids for non-H atoms.
	Fig. 2. Crystal packing of (I), showing the donor···acceptor contacts for the N—H···Br hydrogen bonds as dashed lines.

1,10-Phenanthrolin-1-ium tetrabromido(1,10-phenanthroline-κ²N,N')antimonate(III) dichloromethane solvate top

Crystal data top

(C₁₂H₉N₂)[SbBr(C₁₂H₈N₂)₄]·CH₂Cl₂	Z = 2
M_r = 887.73	F(000) = 844
Triclinic, P1	D_x = 2.019 Mg m⁻³
Hall symbol: -P 1	Mo Kα radiation, λ = 0.71073 Å
a = 11.471 (8) Å	Cell parameters from 2399 reflections
b = 11.582 (9) Å	θ = 2.5–25.3°
c = 12.154 (9) Å	µ = 6.62 mm⁻¹
α = 65.296 (8)°	T = 298 K
β = 84.535 (9)°	Block, yellow
γ = 88.244 (9)°	0.18 × 0.14 × 0.08 mm
V = 1460.1 (19) Å³

Data collection top

Siemens SMART CCD diffractometer	5056 independent reflections
Radiation source: fine-focus sealed tube	3378 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.025
ω scans	θ_max = 25.0°, θ_min = 1.9°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −13→12
T_min = 0.382, T_max = 0.619	k = −12→13
7508 measured reflections	l = −11→14

Refinement top

Refinement on F²	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F² > 2σ(F²)] = 0.040	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.112	H-atom parameters constrained
S = 1.01	w = 1/[σ²(F_o²) + (0.0567P)²] where P = (F_o² + 2F_c²)/3
5056 reflections	(Δ/σ)_max = 0.004
319 parameters	Δρ_max = 1.81 e Å⁻³
9 restraints	Δρ_min = −1.12 e Å⁻³

Crystal data top

(C₁₂H₉N₂)[SbBr(C₁₂H₈N₂)₄]·CH₂Cl₂	γ = 88.244 (9)°
M_r = 887.73	V = 1460.1 (19) Å³
Triclinic, P1	Z = 2
a = 11.471 (8) Å	Mo Kα radiation
b = 11.582 (9) Å	µ = 6.62 mm⁻¹
c = 12.154 (9) Å	T = 298 K
α = 65.296 (8)°	0.18 × 0.14 × 0.08 mm
β = 84.535 (9)°

Data collection top

Siemens SMART CCD diffractometer	5056 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	3378 reflections with I > 2σ(I)
T_min = 0.382, T_max = 0.619	R_int = 0.025
7508 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.040	9 restraints
wR(F²) = 0.112	H-atom parameters constrained
S = 1.01	Δρ_max = 1.81 e Å⁻³
5056 reflections	Δρ_min = −1.12 e Å⁻³
319 parameters

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

	x	y	z	U_iso*/U_eq
Sb1	0.74351 (4)	0.63084 (4)	0.10677 (4)	0.03882 (16)
Br1	0.49189 (7)	0.70645 (7)	0.05598 (7)	0.0551 (2)
Br2	0.77617 (8)	0.37772 (7)	0.14655 (8)	0.0652 (3)
Br3	0.83075 (7)	0.73103 (7)	−0.13286 (7)	0.0577 (2)
Br4	0.69659 (9)	0.56828 (8)	0.35088 (8)	0.0731 (3)
Cl1	1.0701 (5)	0.3451 (6)	0.5116 (5)	0.2246 (18)
Cl2	0.9780 (4)	0.1461 (6)	0.4665 (5)	0.2246 (18)
N1	0.9366 (4)	0.6463 (5)	0.1393 (5)	0.0398 (14)
N2	0.7796 (5)	0.8350 (5)	0.1013 (5)	0.0457 (15)
N3	0.4363 (5)	−0.0210 (6)	0.2689 (6)	0.0569 (17)
N4	0.4445 (5)	0.2270 (6)	0.2372 (5)	0.0500 (16)
H4	0.4677	0.2034	0.1804	0.060*
C1	1.0167 (6)	0.5575 (7)	0.1477 (7)	0.0488 (19)
H1	0.9951	0.4868	0.1363	0.059*
C2	1.1303 (7)	0.5663 (8)	0.1728 (7)	0.061 (2)
H2	1.1838	0.5025	0.1788	0.073*
C3	1.1625 (7)	0.6716 (9)	0.1886 (8)	0.065 (2)
H3	1.2386	0.6791	0.2055	0.078*
C4	1.0815 (6)	0.7671 (7)	0.1794 (6)	0.0477 (19)
C5	0.9690 (6)	0.7522 (6)	0.1522 (6)	0.0397 (17)
C6	0.8850 (6)	0.8488 (6)	0.1358 (6)	0.0405 (17)
C7	0.9154 (7)	0.9599 (6)	0.1483 (6)	0.052 (2)
C8	0.8308 (9)	1.0549 (7)	0.1263 (8)	0.069 (3)
H8	0.8469	1.1290	0.1344	0.083*
C9	0.7264 (9)	1.0383 (7)	0.0936 (8)	0.072 (3)
H9	0.6695	1.1006	0.0795	0.087*
C10	0.7036 (7)	0.9268 (7)	0.0809 (7)	0.059 (2)
H10	0.6313	0.9174	0.0568	0.071*
C11	1.1071 (8)	0.8766 (8)	0.1957 (8)	0.067 (2)
H11	1.1808	0.8848	0.2177	0.080*
C12	1.0297 (8)	0.9689 (8)	0.1808 (8)	0.071 (3)
H12	1.0506	1.0401	0.1918	0.085*
C13	0.4339 (8)	−0.1411 (8)	0.2883 (8)	0.069 (2)
H13	0.4627	−0.1633	0.2256	0.082*
C14	0.3901 (7)	−0.2374 (8)	0.3986 (9)	0.068 (2)
H14	0.3891	−0.3211	0.4074	0.081*
C15	0.3489 (7)	−0.2098 (8)	0.4932 (8)	0.064 (2)
H15	0.3213	−0.2738	0.5674	0.076*
C16	0.3490 (7)	−0.0823 (7)	0.4765 (7)	0.053 (2)
C17	0.3943 (6)	0.0078 (6)	0.3625 (6)	0.0425 (17)
C18	0.3990 (6)	0.1376 (7)	0.3458 (7)	0.0456 (18)
C19	0.3614 (6)	0.1753 (7)	0.4382 (7)	0.0499 (19)
C20	0.3712 (7)	0.3039 (8)	0.4138 (8)	0.062 (2)
H20	0.3445	0.3316	0.4732	0.075*
C21	0.4194 (7)	0.3887 (8)	0.3042 (8)	0.060 (2)
H21	0.4285	0.4734	0.2901	0.072*
C22	0.4549 (7)	0.3494 (7)	0.2141 (7)	0.055 (2)
H22	0.4857	0.4076	0.1380	0.066*
C23	0.3076 (7)	−0.0432 (8)	0.5711 (7)	0.060 (2)
H23	0.2756	−0.1032	0.6457	0.072*
C24	0.3148 (7)	0.0804 (8)	0.5525 (7)	0.064 (2)
H24	0.2890	0.1037	0.6151	0.076*
C25	0.9717 (14)	0.3019 (13)	0.4409 (15)	0.207 (7)
H25A	0.9846	0.3534	0.3541	0.248*
H25B	0.8937	0.3197	0.4679	0.248*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Sb1	0.0378 (3)	0.0331 (3)	0.0476 (3)	0.0008 (2)	−0.0008 (2)	−0.0195 (2)
Br1	0.0486 (5)	0.0630 (5)	0.0542 (5)	0.0059 (4)	−0.0029 (4)	−0.0257 (4)
Br2	0.0822 (6)	0.0437 (4)	0.0748 (6)	−0.0054 (4)	0.0056 (5)	−0.0319 (4)
Br3	0.0639 (5)	0.0546 (5)	0.0564 (5)	−0.0063 (4)	−0.0001 (4)	−0.0256 (4)
Br4	0.1065 (7)	0.0592 (5)	0.0570 (5)	−0.0105 (5)	0.0125 (5)	−0.0310 (4)
Cl1	0.173 (3)	0.312 (5)	0.205 (4)	−0.014 (3)	−0.007 (3)	−0.125 (4)
Cl2	0.173 (3)	0.312 (5)	0.205 (4)	−0.014 (3)	−0.007 (3)	−0.125 (4)
N1	0.037 (3)	0.042 (3)	0.051 (4)	0.004 (3)	−0.005 (3)	−0.029 (3)
N2	0.044 (4)	0.032 (3)	0.056 (4)	0.005 (3)	0.009 (3)	−0.016 (3)
N3	0.063 (4)	0.057 (4)	0.059 (4)	−0.003 (3)	0.004 (4)	−0.034 (3)
N4	0.051 (4)	0.054 (4)	0.049 (4)	−0.006 (3)	0.005 (3)	−0.028 (3)
C1	0.049 (5)	0.052 (4)	0.059 (5)	0.011 (4)	−0.013 (4)	−0.035 (4)
C2	0.046 (5)	0.071 (6)	0.079 (6)	0.021 (4)	−0.015 (4)	−0.043 (5)
C3	0.031 (4)	0.091 (7)	0.076 (6)	0.001 (4)	−0.004 (4)	−0.038 (5)
C4	0.043 (5)	0.059 (5)	0.044 (4)	−0.010 (4)	−0.002 (4)	−0.024 (4)
C5	0.044 (4)	0.037 (4)	0.036 (4)	−0.002 (3)	0.004 (3)	−0.015 (3)
C6	0.044 (4)	0.038 (4)	0.041 (4)	−0.003 (3)	0.009 (3)	−0.020 (3)
C7	0.069 (6)	0.036 (4)	0.046 (5)	−0.012 (4)	0.017 (4)	−0.018 (3)
C8	0.105 (8)	0.034 (4)	0.064 (6)	−0.011 (5)	0.029 (6)	−0.024 (4)
C9	0.088 (7)	0.033 (4)	0.081 (7)	0.011 (5)	0.018 (6)	−0.015 (4)
C10	0.044 (5)	0.040 (4)	0.076 (6)	0.005 (4)	0.010 (4)	−0.010 (4)
C11	0.063 (6)	0.071 (6)	0.070 (6)	−0.020 (5)	−0.011 (5)	−0.030 (5)
C12	0.085 (7)	0.056 (5)	0.081 (7)	−0.027 (5)	0.008 (6)	−0.040 (5)
C13	0.077 (6)	0.068 (6)	0.077 (6)	0.004 (5)	−0.005 (5)	−0.046 (5)
C14	0.071 (6)	0.051 (5)	0.084 (7)	−0.002 (4)	−0.002 (5)	−0.032 (5)
C15	0.069 (6)	0.052 (5)	0.057 (5)	−0.003 (4)	−0.010 (5)	−0.009 (4)
C16	0.054 (5)	0.055 (5)	0.047 (5)	−0.002 (4)	0.000 (4)	−0.020 (4)
C17	0.039 (4)	0.044 (4)	0.044 (4)	0.001 (3)	−0.001 (4)	−0.018 (4)
C18	0.042 (4)	0.049 (4)	0.046 (5)	0.006 (4)	−0.004 (4)	−0.022 (4)
C19	0.046 (5)	0.059 (5)	0.050 (5)	0.002 (4)	−0.001 (4)	−0.029 (4)
C20	0.076 (6)	0.066 (6)	0.060 (6)	0.014 (5)	−0.010 (5)	−0.042 (5)
C21	0.066 (6)	0.051 (5)	0.072 (6)	−0.001 (4)	−0.010 (5)	−0.033 (5)
C22	0.055 (5)	0.047 (5)	0.059 (5)	−0.001 (4)	−0.007 (4)	−0.017 (4)
C23	0.064 (5)	0.058 (5)	0.041 (5)	−0.009 (4)	0.009 (4)	−0.008 (4)
C24	0.072 (6)	0.075 (6)	0.046 (5)	0.005 (5)	0.007 (4)	−0.029 (5)
C25	0.173 (10)	0.174 (10)	0.200 (10)	−0.040 (8)	−0.051 (8)	0.004 (8)

Geometric parameters (Å, º) top

Sb1—N1	2.312 (5)	C8—H8	0.9300
Sb1—N2	2.386 (6)	C9—C10	1.399 (11)
Sb1—Br3	2.742 (2)	C9—H9	0.9300
Sb1—Br4	2.746 (2)	C10—H10	0.9300
Sb1—Br2	2.784 (2)	C11—C12	1.332 (11)
Sb1—Br1	3.035 (2)	C11—H11	0.9300
Cl1—C25	1.686 (13)	C12—H12	0.9300
Cl2—C25	1.698 (13)	C13—C14	1.396 (11)
N1—C1	1.336 (8)	C13—H13	0.9300
N1—C5	1.366 (8)	C14—C15	1.357 (11)
N2—C10	1.310 (8)	C14—H14	0.9300
N2—C6	1.352 (8)	C15—C16	1.403 (10)
N3—C13	1.311 (10)	C15—H15	0.9300
N3—C17	1.356 (8)	C16—C17	1.402 (10)
N4—C22	1.332 (9)	C16—C23	1.440 (10)
N4—C18	1.359 (9)	C17—C18	1.433 (10)
N4—H4	0.8600	C18—C19	1.394 (9)
C1—C2	1.382 (10)	C19—C20	1.397 (10)
C1—H1	0.9300	C19—C24	1.429 (10)
C2—C3	1.378 (11)	C20—C21	1.358 (11)
C2—H2	0.9300	C20—H20	0.9300
C3—C4	1.398 (10)	C21—C22	1.376 (10)
C3—H3	0.9300	C21—H21	0.9300
C4—C5	1.395 (9)	C22—H22	0.9300
C4—C11	1.406 (10)	C23—C24	1.356 (11)
C5—C6	1.416 (9)	C23—H23	0.9300
C6—C7	1.414 (9)	C24—H24	0.9300
C7—C8	1.400 (11)	C25—H25A	0.9700
C7—C12	1.425 (11)	C25—H25B	0.9700
C8—C9	1.340 (12)

N1—Sb1—N2	70.23 (19)	N2—C10—C9	123.0 (8)
N1—Sb1—Br3	83.16 (14)	N2—C10—H10	118.5
N2—Sb1—Br3	86.42 (14)	C9—C10—H10	118.5
N1—Sb1—Br4	85.43 (14)	C12—C11—C4	122.5 (8)
N2—Sb1—Br4	82.19 (14)	C12—C11—H11	118.8
Br3—Sb1—Br4	166.06 (3)	C4—C11—H11	118.8
N1—Sb1—Br2	90.30 (13)	C11—C12—C7	120.8 (7)
N2—Sb1—Br2	160.06 (15)	C11—C12—H12	119.6
Br3—Sb1—Br2	95.76 (3)	C7—C12—H12	119.6
Br4—Sb1—Br2	92.28 (3)	N3—C13—C14	123.1 (8)
N1—Sb1—Br1	159.61 (13)	N3—C13—H13	118.5
N2—Sb1—Br1	89.39 (15)	C14—C13—H13	118.5
Br3—Sb1—Br1	95.34 (4)	C15—C14—C13	120.5 (8)
Br4—Sb1—Br1	92.57 (4)	C15—C14—H14	119.8
Br2—Sb1—Br1	110.07 (3)	C13—C14—H14	119.8
C1—N1—C5	118.8 (6)	C14—C15—C16	118.5 (7)
C1—N1—Sb1	123.8 (4)	C14—C15—H15	120.8
C5—N1—Sb1	117.3 (4)	C16—C15—H15	120.8
C10—N2—C6	118.6 (6)	C17—C16—C15	117.0 (7)
C10—N2—Sb1	126.1 (5)	C17—C16—C23	120.3 (7)
C6—N2—Sb1	114.9 (4)	C15—C16—C23	122.8 (7)
C13—N3—C17	116.9 (7)	N3—C17—C16	124.1 (7)
C22—N4—C18	123.4 (6)	N3—C17—C18	118.4 (6)
C22—N4—H4	118.3	C16—C17—C18	117.5 (6)
C18—N4—H4	118.3	N4—C18—C19	118.6 (7)
N1—C1—C2	122.7 (7)	N4—C18—C17	119.1 (6)
N1—C1—H1	118.7	C19—C18—C17	122.3 (7)
C2—C1—H1	118.7	C18—C19—C20	118.1 (7)
C3—C2—C1	118.7 (7)	C18—C19—C24	118.2 (7)
C3—C2—H2	120.7	C20—C19—C24	123.6 (7)
C1—C2—H2	120.7	C21—C20—C19	120.7 (7)
C2—C3—C4	120.3 (7)	C21—C20—H20	119.7
C2—C3—H3	119.8	C19—C20—H20	119.7
C4—C3—H3	119.8	C20—C21—C22	120.0 (7)
C5—C4—C3	117.7 (7)	C20—C21—H21	120.0
C5—C4—C11	118.6 (7)	C22—C21—H21	120.0
C3—C4—C11	123.8 (7)	N4—C22—C21	119.1 (7)
N1—C5—C4	121.8 (6)	N4—C22—H22	120.4
N1—C5—C6	118.1 (6)	C21—C22—H22	120.4
C4—C5—C6	120.1 (6)	C24—C23—C16	120.6 (7)
N2—C6—C7	121.8 (6)	C24—C23—H23	119.7
N2—C6—C5	118.4 (6)	C16—C23—H23	119.7
C7—C6—C5	119.7 (7)	C23—C24—C19	121.1 (7)
C8—C7—C6	117.5 (8)	C23—C24—H24	119.4
C8—C7—C12	124.2 (8)	C19—C24—H24	119.4
C6—C7—C12	118.3 (7)	Cl1—C25—Cl2	113.9 (9)
C9—C8—C7	119.6 (8)	Cl1—C25—H25A	108.8
C9—C8—H8	120.2	Cl2—C25—H25A	108.8
C7—C8—H8	120.2	Cl1—C25—H25B	108.8
C8—C9—C10	119.6 (8)	Cl2—C25—H25B	108.8
C8—C9—H9	120.2	H25A—C25—H25B	107.7
C10—C9—H9	120.2

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
N4—H4···Br1ⁱ	0.86	2.61	3.327 (6)	141

Symmetry code: (i) −x+1, −y+1, −z.

Experimental details

Crystal data
Chemical formula	(C₁₂H₉N₂)[SbBr(C₁₂H₈N₂)₄]·CH₂Cl₂
M_r	887.73
Crystal system, space group	Triclinic, P1
Temperature (K)	298
a, b, c (Å)	11.471 (8), 11.582 (9), 12.154 (9)
α, β, γ (°)	65.296 (8), 84.535 (9), 88.244 (9)
V (Å³)	1460.1 (19)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	6.62
Crystal size (mm)	0.18 × 0.14 × 0.08

Data collection
Diffractometer	Siemens SMART CCD diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 1996)
T_min, T_max	0.382, 0.619
No. of measured, independent and observed [I > 2σ(I)] reflections	7508, 5056, 3378
R_int	0.025
(sin θ/λ)_max (Å⁻¹)	0.595

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.040, 0.112, 1.01
No. of reflections	5056
No. of parameters	319
No. of restraints	9
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	1.81, −1.12

Computer programs: SMART (Siemens, 1996), SAINT (Siemens, 1996), Please give details, SHELXS97 (Sheldrick, 1997a), SHELXL97 (Sheldrick, 1997a), SHELXTL (Sheldrick, 1997b).

Selected bond lengths (Å) top

Sb1—N1	2.312 (5)	Sb1—Br4	2.746 (2)
Sb1—N2	2.386 (6)	Sb1—Br2	2.784 (2)
Sb1—Br3	2.742 (2)	Sb1—Br1	3.035 (2)