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The complex molecule in the title compound, [NiBr2(C36H40N2)], has mirror symmetry. The NiII atom and two Br atoms are located on the mirror plane. The NiII atom is four-coordinated by the two Br atoms and two N atoms from an N,N′-bis(2,6-diethyl-4-phenyl­phen­yl)butane-2,3-di­imine ligand in a distorted tetra­hedral geometry. The dihedral angle formed between the two adjacent benzene rings is 47.1 (1)°.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S160053681400292X/hy2642sup1.cif
Contains datablocks I, New_Global_Publ_Block

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S160053681400292X/hy2642Isup2.hkl
Contains datablock I

CCDC reference: 982220

Key indicators

  • Single-crystal X-ray study
  • T = 293 K
  • Mean [sigma](C-C) = 0.005 Å
  • R factor = 0.043
  • wR factor = 0.096
  • Data-to-parameter ratio = 17.7

checkCIF/PLATON results

No syntax errors found



Alert level C PLAT242_ALERT_2_C Low Ueq as Compared to Neighbors for ..... Ni1 Check PLAT250_ALERT_2_C Large U3/U1 Ratio for Average U(i,j) Tensor .... 2.1 Note PLAT906_ALERT_3_C Large K value in the Analysis of Variance ...... 2.936 Check PLAT910_ALERT_3_C Missing # of FCF Reflections Below Th(Min) ..... 5 Why ?
Alert level G PLAT005_ALERT_5_G No _iucr_refine_instructions_details in the CIF Please Do ! PLAT128_ALERT_4_G Alternate Setting for Input Space-Group Pnam Pnma Note PLAT199_ALERT_1_G Reported _cell_measurement_temperature ..... (K) 293 Check PLAT200_ALERT_1_G Reported _diffrn_ambient_temperature ..... (K) 293 Check
0 ALERT level A = Most likely a serious problem - resolve or explain 0 ALERT level B = A potentially serious problem, consider carefully 4 ALERT level C = Check. Ensure it is not caused by an omission or oversight 4 ALERT level G = General information/check it is not something unexpected 2 ALERT type 1 CIF construction/syntax error, inconsistent or missing data 2 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

Comment top

There is a considerable interest in the development of new late transition metal catalysts for the polymerization of α-olefins since Brookhart et al. discovered highly active α-diimine nickel catalysts (Johnson et al., 1995; Killian et al., 1996). The ligand structure has a dramatic effect on the reactivity of organometallic complexes (Popeney et al., 2011; Popeney & Guan, 2010). Advances in the field of homogeneous catalysis have led to the synthesis of well defined transition metal complexes capable of catalyzing a wide range of organic transformations. It is well known that the Lewis acid catalyzed Friedel-Crafts alkylation of substituted aromatic rings is a highly versatile C—C bond forming method. In this study, we designed and synthesized the title compound, and its molecular structure was characterized by X-ray diffraction. The dihedral angle formed between the benzene ring and phenylethyl ring is 47.1 (1)°.

Related literature top

For background to α-diimine nickel catalysts, see: Johnson et al. (1995); Killian et al. (1996). For the effect of ligand structure on the reactivity of organometallic complexes, see: Popeney & Guan (2010); Popeney et al. (2011).

Experimental top

Formic acid (0.5 ml) was added to a stirred solution of 2,3-butanedione (0.09 g, 1.00 mmol) and 2,6-diethyl-4-phenylbenzenamine (0.45 g, 2.00 mmol) in ethanol (10 ml). The mixture was refluxed for 24 h, then cooled and the precipitate was separated by filtration. The solid was recrystallized from EtOH/CH2Cl2 (v/v, 10:1), washed and dried under vacuum to give bis[N,N'-(2,6-diethyl-4-(1-phenyl)imino]-1,2-dimethylethane (yield: 0.69 g, 85%). Analysis, calculated for C36H40N2: C 86.35, H 8.05, N 5.59%; found: C 84.96, H 7.21, N 7.82%.

NiBr2(DME) (0.13 g, 1.20 mmol), bis[N,N'-(2,6-diethyl-4-(1-phenyl)imino]-1,2-dimethylethane (0.20 g, 4.00 mmol) and dichloromethane (40 ml) were mixed in a Schlenk flask and stirred at room temperature for 24 h. The resulting suspension was filtered. The solvent was removed under vacuum and the residue was washed with diethyl ether (15 ml) three times, and then dried under vacuum at room temperature to give the title compound (yield: 0.63 g, 82%). Analysis, calculated for C36H40Br2N2Ni: C 60.12, H 5.61, N 3.89%; found: C 59.88, H 5.31, N 3.56%. FT-IR (KBr, cm-1): 1649 (CN). Crystals suitable for X-ray structure determination were grown from a solution of the title compound in a mixture of cyclohexane/dichloromethane (v/v, 1:4).

Refinement top

H atoms were placed in calculated positions and refined as riding atoms, with C—H = 0.93 (aromatic), 0.97 (CH2) and 0.96 (CH3) Å and with Uiso(H) = 1.2(1.5 for methyl)Ueq(C).

Computing details top

Data collection: CrysAlis PRO (Oxford Diffraction, 2012); cell refinement: CrysAlis PRO (Oxford Diffraction, 2012); data reduction: CrysAlis PRO (Oxford Diffraction, 2012); 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 top
[Figure 1] Fig. 1. Molecular structure of the title compound, showing the 30% probability level ellipsoids. [Symmetry code: (a) x, y, 3/2-z.]
[N,N'-Bis(2,6-diethyl-4-phenylphenyl)butane-2,3-diimine-κ2N,N']dibromidonickel(II) top
Crystal data top
[NiBr2(C36H40N2)]Dx = 1.457 Mg m3
Mr = 719.19Mo Kα radiation, λ = 0.71073 Å
Orthorhombic, PnamCell parameters from 2436 reflections
a = 15.6587 (5) Åθ = 3.5–26.1°
b = 6.9359 (3) ŵ = 3.06 mm1
c = 30.1928 (16) ÅT = 293 K
V = 3279.2 (2) Å3Block, brown
Z = 40.42 × 0.38 × 0.35 mm
F(000) = 1472
Data collection top
Oxford Diffraction SuperNova CCD
diffractometer
3415 independent reflections
Radiation source: fine-focus sealed tube2376 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.046
ω scansθmax = 26.4°, θmin = 3.0°
Absorption correction: multi-scan
(CrysAlis PRO; Oxford Diffraction, 2012)
h = 1918
Tmin = 0.508, Tmax = 1.000k = 84
10334 measured reflectionsl = 3722
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.043Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.096H-atom parameters constrained
S = 1.02 w = 1/[σ2(Fo2) + (0.0361P)2 + 2.0948P]
where P = (Fo2 + 2Fc2)/3
3415 reflections(Δ/σ)max < 0.001
193 parametersΔρmax = 0.53 e Å3
0 restraintsΔρmin = 0.53 e Å3
Crystal data top
[NiBr2(C36H40N2)]V = 3279.2 (2) Å3
Mr = 719.19Z = 4
Orthorhombic, PnamMo Kα radiation
a = 15.6587 (5) ŵ = 3.06 mm1
b = 6.9359 (3) ÅT = 293 K
c = 30.1928 (16) Å0.42 × 0.38 × 0.35 mm
Data collection top
Oxford Diffraction SuperNova CCD
diffractometer
3415 independent reflections
Absorption correction: multi-scan
(CrysAlis PRO; Oxford Diffraction, 2012)
2376 reflections with I > 2σ(I)
Tmin = 0.508, Tmax = 1.000Rint = 0.046
10334 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0430 restraints
wR(F2) = 0.096H-atom parameters constrained
S = 1.02Δρmax = 0.53 e Å3
3415 reflectionsΔρmin = 0.53 e Å3
193 parameters
Special details top

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 (Å2) top
xyzUiso*/Ueq
Ni10.34408 (3)0.82145 (10)0.75000.03485 (18)
Br20.28258 (4)0.51120 (8)0.75000.05577 (19)
Br30.49179 (3)0.84183 (12)0.75000.0705 (2)
N10.26850 (15)0.9588 (4)0.70741 (8)0.0293 (6)
C10.28083 (18)0.9383 (5)0.66015 (10)0.0292 (7)
C20.20665 (19)1.0521 (5)0.72490 (10)0.0311 (8)
C30.23084 (19)0.8070 (5)0.63611 (11)0.0330 (8)
C40.3703 (2)0.9915 (5)0.59746 (11)0.0345 (8)
H40.41671.05280.58440.041*
C50.2544 (2)0.7728 (5)0.59207 (11)0.0379 (8)
H50.22170.68820.57530.046*
C60.3243 (2)0.8598 (5)0.57262 (11)0.0347 (8)
C70.34987 (18)1.0362 (5)0.64119 (10)0.0309 (7)
C80.3998 (2)1.1906 (5)0.66489 (12)0.0420 (9)
H8A0.38081.19710.69540.050*
H8B0.45981.15560.66500.050*
C90.0769 (2)0.7102 (8)0.62840 (16)0.0748 (15)
H9A0.08570.64690.60050.112*
H9B0.06270.84300.62340.112*
H9C0.03100.64820.64400.112*
C100.1368 (2)1.1541 (6)0.70058 (12)0.0476 (9)
H10A0.08311.09330.70700.071*
H10B0.14751.14790.66930.071*
H10C0.13481.28650.70980.071*
C110.3499 (2)0.8120 (5)0.52645 (11)0.0411 (9)
C120.2902 (3)0.8027 (6)0.49250 (12)0.0540 (11)
H120.23300.82780.49840.065*
C130.1566 (2)0.6983 (6)0.65535 (12)0.0475 (10)
H13A0.17250.56390.65850.057*
H13B0.14480.74830.68470.057*
C140.3154 (3)0.7564 (7)0.44983 (13)0.0664 (13)
H140.27520.75250.42720.080*
C150.3988 (4)0.7166 (7)0.44081 (14)0.0742 (15)
H150.41510.68470.41210.089*
C160.4587 (3)0.7232 (8)0.47362 (15)0.0754 (15)
H160.51560.69560.46730.091*
C170.4343 (3)0.7713 (7)0.51643 (13)0.0603 (12)
H170.47530.77630.53870.072*
C180.3901 (3)1.3857 (6)0.64409 (15)0.0692 (13)
H18A0.40871.38040.61380.104*
H18B0.42411.47760.66000.104*
H18C0.33121.42400.64510.104*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Ni10.0328 (3)0.0534 (4)0.0183 (3)0.0117 (3)0.0000.000
Br20.0802 (4)0.0450 (3)0.0421 (3)0.0080 (3)0.0000.000
Br30.0341 (3)0.1250 (6)0.0523 (4)0.0136 (3)0.0000.000
N10.0306 (13)0.0418 (16)0.0154 (12)0.0013 (12)0.0013 (11)0.0002 (12)
C10.0321 (16)0.0389 (19)0.0165 (15)0.0037 (15)0.0012 (13)0.0011 (14)
C20.0314 (16)0.0382 (19)0.0236 (17)0.0002 (14)0.0044 (14)0.0020 (15)
C30.0342 (16)0.041 (2)0.0241 (17)0.0025 (15)0.0030 (14)0.0060 (16)
C40.0348 (16)0.045 (2)0.0239 (16)0.0035 (16)0.0037 (15)0.0028 (17)
C50.0451 (19)0.044 (2)0.0244 (17)0.0068 (17)0.0058 (16)0.0037 (17)
C60.0417 (18)0.041 (2)0.0209 (16)0.0002 (16)0.0033 (15)0.0004 (16)
C70.0334 (16)0.037 (2)0.0222 (16)0.0030 (15)0.0022 (14)0.0015 (15)
C80.0433 (19)0.049 (2)0.0339 (19)0.0061 (18)0.0022 (16)0.0062 (19)
C90.050 (2)0.118 (4)0.056 (3)0.031 (3)0.008 (2)0.008 (3)
C100.048 (2)0.061 (2)0.0336 (19)0.0162 (19)0.0063 (17)0.003 (2)
C110.060 (2)0.042 (2)0.0215 (17)0.0061 (18)0.0019 (17)0.0008 (17)
C120.068 (2)0.066 (3)0.028 (2)0.016 (2)0.0033 (19)0.002 (2)
C130.049 (2)0.060 (3)0.034 (2)0.014 (2)0.0001 (17)0.009 (2)
C140.102 (4)0.076 (3)0.022 (2)0.026 (3)0.013 (2)0.003 (2)
C150.124 (4)0.072 (3)0.027 (2)0.011 (3)0.019 (3)0.007 (2)
C160.090 (3)0.098 (4)0.038 (3)0.010 (3)0.024 (3)0.007 (3)
C170.063 (3)0.090 (3)0.028 (2)0.009 (2)0.0031 (19)0.007 (2)
C180.104 (3)0.053 (3)0.050 (3)0.022 (3)0.011 (3)0.009 (2)
Geometric parameters (Å, º) top
Ni1—N11.991 (2)C9—H9A0.9600
Ni1—Br22.3575 (9)C9—H9B0.9600
Ni1—Br32.3173 (8)C9—H9C0.9600
N1—C21.279 (4)C10—H10A0.9600
N1—C11.447 (4)C10—H10B0.9600
C1—C71.399 (4)C10—H10C0.9600
C1—C31.403 (4)C11—C171.386 (5)
C2—C101.496 (4)C11—C121.388 (5)
C2—C2i1.516 (6)C12—C141.385 (6)
C3—C51.400 (5)C12—H120.9300
C3—C131.503 (4)C13—H13A0.9700
C4—C61.384 (5)C13—H13B0.9700
C4—C71.393 (4)C14—C151.363 (6)
C4—H40.9300C14—H140.9300
C5—C61.381 (5)C15—C161.365 (7)
C5—H50.9300C15—H150.9300
C6—C111.488 (4)C16—C171.389 (5)
C7—C81.507 (4)C16—H160.9300
C8—C181.499 (6)C17—H170.9300
C8—H8A0.9700C18—H18A0.9600
C8—H8B0.9700C18—H18B0.9600
C9—C131.492 (5)C18—H18C0.9600
N1i—Ni1—N180.49 (14)C13—C9—H9C109.5
N1i—Ni1—Br3124.35 (7)H9A—C9—H9C109.5
N1—Ni1—Br3124.35 (7)H9B—C9—H9C109.5
N1i—Ni1—Br2101.19 (8)C2—C10—H10A109.5
N1—Ni1—Br2101.19 (8)C2—C10—H10B109.5
Br3—Ni1—Br2117.61 (4)H10A—C10—H10B109.5
C2—N1—C1123.9 (3)C2—C10—H10C109.5
C2—N1—Ni1115.2 (2)H10A—C10—H10C109.5
C1—N1—Ni1120.70 (19)H10B—C10—H10C109.5
C7—C1—C3122.3 (3)C17—C11—C12118.1 (3)
C7—C1—N1117.3 (3)C17—C11—C6120.4 (3)
C3—C1—N1120.0 (3)C12—C11—C6121.4 (3)
N1—C2—C10126.2 (3)C14—C12—C11120.4 (4)
N1—C2—C2i114.40 (17)C14—C12—H12119.8
C10—C2—C2i119.41 (18)C11—C12—H12119.8
C5—C3—C1117.0 (3)C9—C13—C3114.1 (3)
C5—C3—C13119.1 (3)C9—C13—H13A108.7
C1—C3—C13123.9 (3)C3—C13—H13A108.7
C6—C4—C7122.7 (3)C9—C13—H13B108.7
C6—C4—H4118.6C3—C13—H13B108.7
C7—C4—H4118.6H13A—C13—H13B107.6
C6—C5—C3122.6 (3)C15—C14—C12120.4 (4)
C6—C5—H5118.7C15—C14—H14119.8
C3—C5—H5118.7C12—C14—H14119.8
C5—C6—C4118.1 (3)C14—C15—C16120.5 (4)
C5—C6—C11121.0 (3)C14—C15—H15119.8
C4—C6—C11121.0 (3)C16—C15—H15119.8
C4—C7—C1117.2 (3)C15—C16—C17119.6 (4)
C4—C7—C8119.3 (3)C15—C16—H16120.2
C1—C7—C8123.5 (3)C17—C16—H16120.2
C18—C8—C7113.0 (3)C11—C17—C16121.0 (4)
C18—C8—H8A109.0C11—C17—H17119.5
C7—C8—H8A109.0C16—C17—H17119.5
C18—C8—H8B109.0C8—C18—H18A109.5
C7—C8—H8B109.0C8—C18—H18B109.5
H8A—C8—H8B107.8H18A—C18—H18B109.5
C13—C9—H9A109.5C8—C18—H18C109.5
C13—C9—H9B109.5H18A—C18—H18C109.5
H9A—C9—H9B109.5H18B—C18—H18C109.5
N1i—Ni1—N1—C25.1 (3)C7—C4—C6—C11178.2 (3)
Br3—Ni1—N1—C2130.5 (2)C6—C4—C7—C11.4 (5)
Br2—Ni1—N1—C294.5 (2)C6—C4—C7—C8176.1 (3)
N1i—Ni1—N1—C1179.54 (19)C3—C1—C7—C43.0 (5)
Br3—Ni1—N1—C154.2 (3)N1—C1—C7—C4169.6 (3)
Br2—Ni1—N1—C180.8 (2)C3—C1—C7—C8174.4 (3)
C2—N1—C1—C7110.0 (4)N1—C1—C7—C813.0 (5)
Ni1—N1—C1—C775.1 (3)C4—C7—C8—C1863.1 (4)
C2—N1—C1—C377.2 (4)C1—C7—C8—C18114.3 (4)
Ni1—N1—C1—C397.7 (3)C5—C6—C11—C17132.5 (4)
C1—N1—C2—C100.4 (5)C4—C6—C11—C1746.9 (5)
Ni1—N1—C2—C10174.8 (3)C5—C6—C11—C1246.1 (5)
C1—N1—C2—C2i179.5 (2)C4—C6—C11—C12134.4 (4)
Ni1—N1—C2—C2i4.3 (2)C17—C11—C12—C140.8 (6)
C7—C1—C3—C51.8 (5)C6—C11—C12—C14179.5 (4)
N1—C1—C3—C5170.6 (3)C5—C3—C13—C952.4 (5)
C7—C1—C3—C13179.7 (3)C1—C3—C13—C9129.8 (4)
N1—C1—C3—C137.2 (5)C11—C12—C14—C151.0 (7)
C1—C3—C5—C61.1 (5)C12—C14—C15—C160.5 (7)
C13—C3—C5—C6176.8 (3)C14—C15—C16—C170.1 (8)
C3—C5—C6—C42.7 (5)C12—C11—C17—C160.2 (7)
C3—C5—C6—C11176.8 (3)C6—C11—C17—C16178.9 (4)
C7—C4—C6—C51.3 (5)C15—C16—C17—C110.3 (8)
Symmetry code: (i) x, y, z+3/2.
Selected bond lengths (Å) top
Ni1—N11.991 (2)Ni1—Br32.3173 (8)
Ni1—Br22.3575 (9)
 

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