Bis[μ-N-(diethyl-amino-κN)dimethyl-silylanilido-κN:N]bis-[chlorido-cobalt(II)].

In the title binuclear Co(II) complex, [Co(2)(C(12)H(21)N(2)Si)(2)Cl(2)], an inversion center is located at the mid-point between the two Co atoms in the dimeric mol-ecule. The bidentate N-silylated anilide ligand coordinates the Co(II) atom in an N,N'-chelating mode and provides the anilide N atom as a bridge to link two Co(II) atoms. The two ends of the N-Si-N chelating unit exhibit different affinities for the metal atom. The Co-N(anilide) bond is 2.031 (6) Å and Co-N(amino) bond is 2.214 (6) Å. The four-coordinate Co atom presents a distorted tetra-hedral geometry, while the dimeric aggregation exhibits a (CoN)(2) rhombus core with 1.998 (6) Å as the shortest sides and shows a ladder structure composed of Co, N and Si atoms.

Related literature

For related reviews of metal amides, see: Holm et al. (1996 ▶); Kempe (2000 ▶). For catalytic applications of related N-silylated analido group 4 metal compounds towards olefin polymerization, see: Gibson et al. (1998 ▶); Hill & Hitchcock (2002 ▶); Yuan et al. (2010 ▶). For related organometallic compounds supported by analogous analido ligands, see: Schumann et al. (2000 ▶); Chen (2008 ▶, 2009 ▶). For related cobalt amides, see: Murray & Power (1984 ▶); Hope et al. (1985 ▶).

Experimental

Crystal data

[Co2(C12H21N2Si)2Cl2]

M = 631.56

Orthorhombic,

a = 12.180 (1) Å

b = 15.6753 (13) Å

c = 16.0235 (13) Å

V = 3059.3 (4) Å3

Z = 4

Mo Kα radiation

μ = 1.36 mm−1

T = 293 K

0.20 × 0.15 × 0.10 mm

Data collection

Bruker SMART area-detector diffractometer

Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ▶) T min = 0.773, T max = 0.876

16361 measured reflections

2885 independent reflections

1795 reflections with I > 2σ(I)

R int = 0.093

Refinement

R[F 2 > 2σ(F 2)] = 0.072

wR(F 2) = 0.227

S = 1.17

2885 reflections

154 parameters

48 restraints

H-atom parameters constrained

Δρmax = 1.97 e Å−3

Δρmin = −0.51 e Å−3

Data collection: SMART (Bruker, 2000 ▶); cell refinement: SAINT (Bruker, 2000 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: SHELXTL/PC (Sheldrick, 2008 ▶); software used to prepare material for publication: SHELXL97.

Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S1600536811054602/jj2112sup1.cif

Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536811054602/jj2112Isup2.hkl

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

[Co2(C12H21N2Si)2Cl2]	F(000) = 1320
Mr = 631.56	Dx = 1.371 Mg m−3
Orthorhombic, Pccn	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ab 2ac	Cell parameters from 3365 reflections
a = 12.180 (1) Å	θ = 2.3–26.3°
b = 15.6753 (13) Å	µ = 1.36 mm−1
c = 16.0235 (13) Å	T = 293 K
V = 3059.3 (4) Å3	Block, green
Z = 4	0.20 × 0.15 × 0.10 mm

Bruker SMART area-detector diffractometer	2885 independent reflections
Radiation source: fine-focus sealed tube	1795 reflections with I > 2σ(I)
graphite	Rint = 0.093
Detector resolution: 7.9 pixels mm-1	θmax = 25.6°, θmin = 2.1°
φ and ω scan	h = −14→14
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	k = −17→19
Tmin = 0.773, Tmax = 0.876	l = −13→19
16361 measured reflections

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)] = 0.072	Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.227	H-atom parameters constrained
S = 1.17	w = 1/[σ2(Fo2) + (0.0945P)2 + 13.3754P] where P = (Fo2 + 2Fc2)/3
2885 reflections	(Δ/σ)max < 0.001
154 parameters	Δρmax = 1.97 e Å−3
48 restraints	Δρmin = −0.51 e Å−3

Experimental. MS (EI, 70 eV): m/z 632 [M]+.

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.

	x	y	z	Uiso*/Ueq
Co1	0.55911 (8)	0.48017 (6)	0.43654 (6)	0.0307 (3)
Si1	0.37762 (17)	0.55954 (13)	0.36970 (13)	0.0356 (5)
Cl1	0.71974 (18)	0.48946 (17)	0.37397 (16)	0.0617 (7)
N1	0.4612 (5)	0.5831 (4)	0.4563 (4)	0.0328 (14)
N2	0.4195 (5)	0.4511 (4)	0.3528 (4)	0.0303 (13)
C1	0.4863 (7)	0.6714 (5)	0.4684 (6)	0.0472 (14)
C2	0.5770 (8)	0.7089 (5)	0.4330 (6)	0.0534 (14)
H2A	0.6230	0.6770	0.3988	0.064*
C3	0.6006 (9)	0.7956 (6)	0.4482 (6)	0.0601 (15)
H3A	0.6627	0.8207	0.4250	0.072*
C4	0.5322 (9)	0.8417 (6)	0.4969 (6)	0.0620 (15)
H4A	0.5474	0.8991	0.5059	0.074*
C5	0.4443 (8)	0.8075 (6)	0.5320 (7)	0.0607 (15)
H5A	0.3997	0.8408	0.5660	0.073*
C6	0.4175 (8)	0.7207 (5)	0.5182 (6)	0.0536 (14)
H6A	0.3549	0.6971	0.5420	0.064*
C7	0.2306 (8)	0.5722 (7)	0.3939 (8)	0.079 (4)
H7A	0.1963	0.6064	0.3516	0.119*
H7B	0.2226	0.5996	0.4472	0.119*
H7C	0.1962	0.5171	0.3957	0.119*
C8	0.4136 (10)	0.6277 (6)	0.2788 (6)	0.073 (3)
H8A	0.3484	0.6541	0.2573	0.109*
H8B	0.4465	0.5932	0.2361	0.109*
H8C	0.4646	0.6710	0.2960	0.109*
C9	0.4621 (7)	0.4311 (5)	0.2680 (5)	0.0456 (18)
H9A	0.5153	0.4742	0.2523	0.055*
H9B	0.4019	0.4338	0.2285	0.055*
C10	0.5154 (8)	0.3447 (6)	0.2621 (6)	0.057 (2)
H10A	0.5407	0.3355	0.2060	0.085*
H10B	0.4629	0.3014	0.2765	0.085*
H10C	0.5765	0.3420	0.2998	0.085*
C11	0.3406 (7)	0.3856 (5)	0.3839 (5)	0.0468 (19)
H11A	0.3119	0.4042	0.4374	0.056*
H11B	0.3800	0.3326	0.3930	0.056*
C12	0.2441 (8)	0.3683 (6)	0.3251 (6)	0.056 (2)
H12A	0.1971	0.3257	0.3492	0.083*
H12B	0.2714	0.3483	0.2724	0.083*
H12C	0.2032	0.4200	0.3169	0.083*

	U11	U22	U33	U12	U13	U23
Co1	0.0344 (5)	0.0272 (5)	0.0305 (6)	0.0036 (4)	0.0043 (4)	0.0027 (4)
Si1	0.0450 (12)	0.0250 (11)	0.0369 (12)	0.0043 (9)	−0.0108 (10)	0.0007 (9)
Cl1	0.0470 (12)	0.0727 (17)	0.0655 (15)	0.0029 (11)	0.0246 (11)	0.0051 (12)
N1	0.040 (3)	0.023 (3)	0.036 (4)	0.005 (2)	−0.006 (3)	0.001 (2)
N2	0.045 (3)	0.018 (3)	0.028 (3)	0.000 (2)	−0.004 (3)	−0.002 (2)
C1	0.064 (3)	0.024 (3)	0.053 (3)	0.001 (2)	−0.020 (3)	0.003 (2)
C2	0.069 (3)	0.030 (3)	0.061 (3)	−0.004 (2)	−0.019 (3)	0.006 (2)
C3	0.077 (3)	0.035 (3)	0.068 (3)	−0.006 (3)	−0.022 (3)	0.007 (3)
C4	0.082 (3)	0.035 (3)	0.069 (3)	−0.001 (3)	−0.025 (3)	0.002 (2)
C5	0.081 (3)	0.036 (3)	0.066 (3)	0.007 (3)	−0.022 (3)	−0.003 (2)
C6	0.072 (3)	0.030 (3)	0.059 (3)	0.005 (2)	−0.020 (3)	−0.001 (2)
C7	0.058 (6)	0.079 (8)	0.100 (9)	0.027 (6)	−0.024 (6)	−0.027 (7)
C8	0.139 (10)	0.036 (5)	0.042 (5)	−0.014 (6)	−0.035 (6)	0.010 (4)
C9	0.060 (5)	0.043 (4)	0.034 (4)	−0.003 (4)	0.005 (3)	0.001 (3)
C10	0.074 (5)	0.051 (5)	0.046 (4)	0.004 (4)	0.007 (4)	−0.011 (4)
C11	0.056 (4)	0.036 (4)	0.048 (4)	−0.008 (3)	−0.012 (4)	0.006 (3)
C12	0.062 (4)	0.043 (4)	0.062 (5)	−0.014 (4)	−0.017 (4)	0.007 (4)

Co1—N1i	1.998 (6)	C5—C6	1.416 (12)
Co1—N1	2.031 (6)	C5—H5A	0.9300
Co1—Cl1	2.203 (2)	C6—H6A	0.9300
Co1—N2	2.214 (6)	C7—H7A	0.9600
Co1—Co1i	2.5682 (19)	C7—H7B	0.9600
Co1—Si1	2.754 (2)	C7—H7C	0.9600
Si1—N1	1.760 (6)	C8—H8A	0.9600
Si1—N2	1.795 (6)	C8—H8B	0.9600
Si1—C7	1.843 (10)	C8—H8C	0.9600
Si1—C8	1.859 (9)	C9—C10	1.505 (12)
N1—C1	1.431 (9)	C9—H9A	0.9700
N1—Co1i	1.998 (6)	C9—H9B	0.9700
N2—C9	1.487 (10)	C10—H10A	0.9600
N2—C11	1.492 (10)	C10—H10B	0.9600
C1—C2	1.375 (13)	C10—H10C	0.9600
C1—C6	1.391 (13)	C11—C12	1.531 (11)
C2—C3	1.410 (12)	C11—H11A	0.9700
C2—H2A	0.9300	C11—H11B	0.9700
C3—C4	1.351 (14)	C12—H12A	0.9600
C3—H3A	0.9300	C12—H12B	0.9600
C4—C5	1.323 (14)	C12—H12C	0.9600
C4—H4A	0.9300
N1i—Co1—N1	100.8 (2)	C5—C4—C3	121.9 (10)
N1i—Co1—Cl1	122.26 (18)	C5—C4—H4A	119.1
N1—Co1—Cl1	122.67 (19)	C3—C4—H4A	119.1
N1i—Co1—N2	108.9 (2)	C4—C5—C6	120.6 (10)
N1—Co1—N2	78.9 (2)	C4—C5—H5A	119.7
Cl1—Co1—N2	114.83 (18)	C6—C5—H5A	119.7
N1i—Co1—Co1i	50.96 (17)	C1—C6—C5	119.0 (9)
N1—Co1—Co1i	49.84 (17)	C1—C6—H6A	120.5
Cl1—Co1—Co1i	147.37 (10)	C5—C6—H6A	120.5
N2—Co1—Co1i	95.69 (16)	Si1—C7—H7A	109.5
N1i—Co1—Si1	117.33 (18)	Si1—C7—H7B	109.5
N1—Co1—Si1	39.67 (17)	H7A—C7—H7B	109.5
Cl1—Co1—Si1	120.40 (9)	Si1—C7—H7C	109.5
N2—Co1—Si1	40.57 (15)	H7A—C7—H7C	109.5
Co1i—Co1—Si1	75.44 (6)	H7B—C7—H7C	109.5
N1—Si1—N2	98.8 (3)	Si1—C8—H8A	109.5
N1—Si1—C7	111.9 (4)	Si1—C8—H8B	109.5
N2—Si1—C7	114.2 (4)	H8A—C8—H8B	109.5
N1—Si1—C8	111.2 (4)	Si1—C8—H8C	109.5
N2—Si1—C8	111.0 (4)	H8A—C8—H8C	109.5
C7—Si1—C8	109.4 (6)	H8B—C8—H8C	109.5
N1—Si1—Co1	47.44 (19)	N2—C9—C10	113.5 (7)
N2—Si1—Co1	53.33 (19)	N2—C9—H9A	108.9
C7—Si1—Co1	138.3 (4)	C10—C9—H9A	108.9
C8—Si1—Co1	112.0 (4)	N2—C9—H9B	108.9
C1—N1—Si1	115.7 (5)	C10—C9—H9B	108.9
C1—N1—Co1i	112.9 (5)	H9A—C9—H9B	107.7
Si1—N1—Co1i	120.1 (3)	C9—C10—H10A	109.5
C1—N1—Co1	131.6 (5)	C9—C10—H10B	109.5
Si1—N1—Co1	92.9 (3)	H10A—C10—H10B	109.5
Co1i—N1—Co1	79.2 (2)	C9—C10—H10C	109.5
C9—N2—C11	112.6 (6)	H10A—C10—H10C	109.5
C9—N2—Si1	115.9 (5)	H10B—C10—H10C	109.5
C11—N2—Si1	114.7 (5)	N2—C11—C12	114.2 (7)
C9—N2—Co1	109.2 (5)	N2—C11—H11A	108.7
C11—N2—Co1	115.7 (4)	C12—C11—H11A	108.7
Si1—N2—Co1	86.1 (2)	N2—C11—H11B	108.7
C2—C1—C6	118.9 (8)	C12—C11—H11B	108.7
C2—C1—N1	122.0 (8)	H11A—C11—H11B	107.6
C6—C1—N1	119.2 (8)	C11—C12—H12A	109.5
C1—C2—C3	120.4 (10)	C11—C12—H12B	109.5
C1—C2—H2A	119.8	H12A—C12—H12B	109.5
C3—C2—H2A	119.8	C11—C12—H12C	109.5
C4—C3—C2	119.3 (10)	H12A—C12—H12C	109.5
C4—C3—H3A	120.4	H12B—C12—H12C	109.5
C2—C3—H3A	120.4