Di-μ-chloro-bis­[(2,2′:6,2′′-ter­pyridine)copper(II)] diperchlorate

Valdés-Martínez, J.; Salazar-Mendoza, D.; Toscano, R.A.

doi:10.1107/S1600536802020470

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Di-μ-chloro-bis[(2,2′:6,2′′-terpyridine)copper(II)] diperchlorate

J. Valdés-Martínez, D. Salazar-Mendoza and R. A. Toscano

The asymmetric unit of the title compound, [Cu₂Cl₂(C₁₅H₁₁N₃)₂](ClO₄)₂, consists of a centrosymmetric binuclear dication, [Cu₂(terpyridine)₂Cl₂]²⁺, and two perchlorate anions. In the dication, both Cu atoms have a 4+1 coordination, in an approximate square-pyramidal geometry.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536802020470/lh6012sup1.cif Contains datablocks global, I
	Structure factor file (CIF format) https://doi.org/10.1107/S1600536802020470/lh6012Isup2.hkl Contains datablock I

CCDC reference: 202283

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Key indicators

Single-crystal X-ray study
T = 293 K
Mean (C-C) = 0.013 Å
R factor = 0.060
wR factor = 0.173
Data-to-parameter ratio = 12.4

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No syntax errors found

ADDSYM reports no extra symmetry

General Notes



ABSTM_02  When printed, the submitted absorption T values will be replaced
          by the scaled T values. Since the ratio of scaled T's is
          identical to the ratio of reported T values, the scaling does
          not imply a change to the absorption corrections used in the
          study.
          Ratio of Tmax expected/reported      1.377
          Tmax scaled      0.734 Tmin scaled      0.599

Comment top

The introduction of transition metals in a supramolecular structure provides access to properties and geometries that are not readily accessible through crystal engineering of organic molecular solids, for example, it is possible to obtain square-planar geometries and magnetic, electronic and catalytic properties through the presence of transition metal ions (Aakeröy, 2001).

Any good supramolecular synthesis requires control at a molecular and a supramolecular level, usually the control at a molecular level is attainable. This is not the case with the Cu^II ion, which presents in one oxidation state a greater diversity in its stereochemical behavior than any other element (Wells, 1984). Due to its possible use in magnetic supramolecular materials it is necessary to find a system where it is possible to have control on the geometry of this ion. A successful approach to control the geometry of transition metal ions has been the use of blocking ligands that have only specific coordination sites available to incoming ligands (Holliday & Mirkin, 2001). Terdentate amines are possible blocking ligands for Cu^II when square-pyramidal geometry is required. This geometry has been observed for Cu compounds with the general formula [Cu₂(NNN)₂Cl₂]²⁺, where NNN is terpyridine (terpy) (Rojo et al., 1987), NNN is propylenetriamine and diethylenetriamine (Urtiaga et al., 19969). Also, a non-centrosymmetric compound in which a water molecules are coordinated axially to one of the Cu^II ions has been reported (Willet, 2001). In this compound, one of the Cu^II ions has a square-pyramidal geometry, but the other one is hexacoordinated. In this paper, we report the structure of [Cu₂(terpy)₂Cl₂]²⁺ as a diperchlorate.

Compound (I) consists of centrosymmetric dinuclear [Cu₂(terpy)₂Cl₂] dications and ClO₄ anions (see Fig. 1). The Cu^II ions have a 4 + 1 coordination in an approximate square-pyramidal geometry, according to the τ-descriptor value of 0.27 for five-coordination geometry (Addison et al., 1984). The three N atoms of the terpy ligand and a Cl⁻ anion coordinate to the Cu atom in a pseudo-planar primary coordination sphere, with the Cu atom 0.135 Å out of the N1/N11/N21/Cl1 mean plane. The Cl⁻ semicoordinates to a second Cu atom in the apical position of the pyramid producing dimers.

In the crystal structure of (I), a π–π interaction between atoms N11 and N21(1 − x,-y,-z) is observed. The pyridine rings are parallel (within experimental error), with a centroid–centroid distance of 3.66 Å and a perpendicular distance of 3.4 Å.

Compound (I) has the expected square-pyramid structure with no water or perchlorate molecules coordinated in the six position. Compound (I) may be a good starting material in the synthesis of supramolecular structures where Cu^II building blocks with two available sites at a 90° are desired.

Experimental top

CuCl₂(H₂O)₂ (1.0 mmol) and NaClO₄ (2.0 mmol) were disolved in distilled H₂O and added to a solution of 2,2':6',2''-terpyridine (1.0 mmol) in acetonitrile (25 ml). The mixture was stirred 1 h and left to evaporate slowly until blue crystals were obtained.

Computing details top

Data collection: XSCANS (Siemens, 1993); cell refinement: XSCANS; data reduction: XSCANS; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: PLATON (Spek, 1999) and Mercury (Version 1.1; Bruno et al., 2002); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 1999).

Figures top

	Fig. 1. A view of (I), with displacement ellipsoids drawn at the 30% probability level [symmetry code: (i) is −x, −y, −z].
	Fig. 2. The crystal packing of (I), viewed down the b axis.

Di-µ-chloro-bis[(2,2':6,2''-terpyridine)copper(II)] diperchlorate top

Crystal data top

[Cu₂Cl₂(C₁₅H₁₁N₃)₂](ClO₄)₂	F(000) = 868
M_r = 863.42	D_x = 1.786 Mg m⁻³
Monoclinic, P2₁/n	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2yn	Cell parameters from 46 reflections
a = 7.439 (1) Å	θ = 4.7–12.5°
b = 24.387 (4) Å	µ = 1.72 mm⁻¹
c = 9.196 (1) Å	T = 293 K
β = 105.76 (1)°	Truncated pyramid, blue
V = 1605.6 (4) Å³	0.32 × 0.20 × 0.18 mm
Z = 2

Data collection top

Siemens P4/PC diffractometer	1856 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	R_int = 0.078
Graphite monochromator	θ_max = 25.0°, θ_min = 1.7°
ω–2θ scans	h = 0→8
Absorption correction: ψ scan (North et al., 1968)	k = 0→29
T_min = 0.435, T_max = 0.533	l = −10→10
3043 measured reflections	3 standard reflections every 97 reflections
2818 independent reflections	intensity decay: 3.5%

Refinement top

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)] = 0.060	H-atom parameters not refined
wR(F²) = 0.173	w = 1/[σ²(F_o²) + (0.067P)² + 2.0508P] where P = (F_o² + 2F_c²)/3
S = 1.07	(Δ/σ)_max < 0.001
2818 reflections	Δρ_max = 0.46 e Å⁻³
227 parameters	Δρ_min = −0.65 e Å⁻³
0 restraints	Extinction correction: SHELXL97, Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.0094 (11)

Crystal data top

[Cu₂Cl₂(C₁₅H₁₁N₃)₂](ClO₄)₂	V = 1605.6 (4) Å³
M_r = 863.42	Z = 2
Monoclinic, P2₁/n	Mo Kα radiation
a = 7.439 (1) Å	µ = 1.72 mm⁻¹
b = 24.387 (4) Å	T = 293 K
c = 9.196 (1) Å	0.32 × 0.20 × 0.18 mm
β = 105.76 (1)°

Data collection top

Siemens P4/PC diffractometer	1856 reflections with I > 2σ(I)
Absorption correction: ψ scan (North et al., 1968)	R_int = 0.078
T_min = 0.435, T_max = 0.533	3 standard reflections every 97 reflections
3043 measured reflections	intensity decay: 3.5%
2818 independent reflections

Refinement top

R[F² > 2σ(F²)] = 0.060	0 restraints
wR(F²) = 0.173	H-atom parameters not refined
S = 1.07	Δρ_max = 0.46 e Å⁻³
2818 reflections	Δρ_min = −0.65 e Å⁻³
227 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

	x	y	z	U_iso*/U_eq
Cu	0.23258 (13)	0.01644 (4)	0.03173 (10)	0.0379 (3)
Cl1	0.0204 (3)	0.00230 (8)	−0.1879 (2)	0.0450 (5)
N1	0.4336 (9)	0.0292 (3)	0.2129 (7)	0.0411 (15)
C2	0.5324 (10)	−0.0141 (3)	0.2807 (8)	0.0402 (16)
C3	0.6779 (12)	−0.0047 (4)	0.4129 (10)	0.058 (2)
H3	0.7493	−0.0352	0.4641	0.069*
C4	0.7176 (13)	0.0467 (4)	0.4679 (10)	0.061 (3)
H4	0.8197	0.0529	0.5560	0.073*
C5	0.6073 (13)	0.0909 (4)	0.3949 (9)	0.056 (2)
H5	0.6293	0.1275	0.4343	0.067*
C6	0.4651 (11)	0.0807 (3)	0.2633 (9)	0.0426 (17)
N11	0.3365 (9)	−0.0608 (3)	0.0675 (7)	0.0422 (14)
C12	0.4718 (11)	−0.0661 (3)	0.2019 (9)	0.0436 (17)
C13	0.5396 (13)	−0.1173 (4)	0.2539 (12)	0.059 (2)
H13	0.6324	−0.1207	0.3491	0.071*
C14	0.4735 (15)	−0.1640 (4)	0.1689 (12)	0.063 (3)
H14	0.5202	−0.1997	0.2044	0.075*
C15	0.3426 (15)	−0.1578 (4)	0.0344 (12)	0.063 (2)
H15	0.2960	−0.1893	−0.0267	0.076*
C16	0.2767 (13)	−0.1065 (3)	−0.0132 (10)	0.0477 (19)
H16	0.1835	−0.1028	−0.1081	0.057*
N21	0.2278 (10)	0.0987 (2)	0.0379 (8)	0.0435 (15)
C22	0.3441 (11)	0.1211 (3)	0.1650 (9)	0.0435 (18)
C23	0.3512 (14)	0.1773 (3)	0.1895 (12)	0.059 (2)
H23	0.4363	0.1923	0.2783	0.071*
C24	0.2385 (18)	0.2100 (4)	0.0881 (14)	0.076 (3)
H24	0.2360	0.2486	0.1079	0.091*
C25	0.1264 (17)	0.1892 (4)	−0.0421 (14)	0.077 (3)
H25	0.0532	0.2132	−0.1183	0.093*
C26	0.1205 (12)	0.1327 (4)	−0.0632 (10)	0.051 (2)
H26	0.0374	0.1174	−0.1527	0.061*
Cl2	0.4707 (3)	−0.32610 (8)	0.0479 (3)	0.0557 (6)
O1	0.4210 (13)	−0.3781 (3)	0.0939 (12)	0.096 (3)
O2	0.5406 (15)	−0.3342 (4)	−0.0808 (9)	0.097 (3)
O3	0.6117 (14)	−0.3025 (3)	0.1638 (10)	0.095 (3)
O4	0.3109 (14)	−0.2911 (3)	0.0107 (12)	0.101 (3)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Cu	0.0373 (5)	0.0396 (5)	0.0350 (5)	0.0017 (4)	0.0068 (3)	0.0016 (4)
Cl1	0.0444 (10)	0.0570 (11)	0.0326 (9)	−0.0011 (8)	0.0087 (7)	0.0014 (7)
N1	0.041 (4)	0.043 (4)	0.041 (3)	0.001 (3)	0.013 (3)	0.004 (3)
C2	0.032 (4)	0.053 (4)	0.038 (4)	−0.005 (3)	0.013 (3)	0.003 (3)
C3	0.042 (4)	0.092 (7)	0.041 (4)	0.009 (4)	0.014 (4)	0.018 (4)
C4	0.056 (6)	0.079 (6)	0.044 (4)	−0.025 (5)	0.006 (4)	−0.012 (4)
C5	0.054 (5)	0.070 (6)	0.040 (4)	−0.007 (4)	0.005 (4)	−0.004 (4)
C6	0.041 (4)	0.049 (4)	0.037 (4)	−0.009 (3)	0.010 (3)	−0.001 (3)
N11	0.039 (4)	0.046 (3)	0.046 (4)	0.006 (3)	0.019 (3)	0.002 (3)
C12	0.036 (4)	0.055 (5)	0.043 (4)	0.007 (3)	0.016 (3)	0.009 (3)
C13	0.052 (5)	0.050 (5)	0.073 (6)	0.012 (4)	0.012 (5)	0.020 (4)
C14	0.073 (7)	0.041 (4)	0.082 (7)	0.007 (4)	0.033 (6)	0.020 (4)
C15	0.073 (7)	0.044 (4)	0.078 (6)	0.017 (4)	0.031 (5)	0.001 (4)
C16	0.064 (5)	0.033 (3)	0.049 (4)	0.011 (4)	0.019 (4)	−0.001 (3)
N21	0.043 (3)	0.034 (3)	0.051 (4)	0.001 (3)	0.009 (3)	0.010 (3)
C22	0.046 (5)	0.040 (4)	0.046 (4)	−0.009 (3)	0.017 (4)	0.000 (3)
C23	0.067 (6)	0.035 (4)	0.076 (6)	−0.007 (4)	0.021 (5)	−0.008 (4)
C24	0.095 (9)	0.037 (5)	0.105 (9)	0.003 (5)	0.043 (7)	0.000 (5)
C25	0.087 (8)	0.057 (6)	0.088 (8)	0.011 (5)	0.023 (7)	0.023 (5)
C26	0.048 (5)	0.051 (5)	0.052 (5)	0.003 (4)	0.011 (4)	0.014 (4)
Cl2	0.0617 (13)	0.0417 (10)	0.0548 (12)	−0.0024 (9)	0.0008 (10)	−0.0017 (8)
O1	0.103 (7)	0.053 (4)	0.130 (8)	−0.011 (4)	0.026 (6)	0.017 (4)
O2	0.115 (7)	0.113 (7)	0.062 (5)	0.003 (6)	0.020 (5)	0.009 (5)
O3	0.106 (7)	0.080 (5)	0.077 (5)	−0.011 (5)	−0.012 (5)	−0.019 (4)
O4	0.094 (7)	0.066 (5)	0.126 (8)	0.018 (4)	0.003 (6)	0.002 (5)

Geometric parameters (Å, º) top

Cu—N1	1.938 (6)	C13—H13	0.9600
Cu—N21	2.008 (6)	C14—C15	1.359 (15)
Cu—N11	2.028 (6)	C14—H14	0.9599
Cu—Cl1	2.227 (2)	C15—C16	1.371 (11)
Cu—Cl1ⁱ	2.698 (2)	C15—H15	0.9600
Cl1—Cuⁱ	2.698 (2)	C16—H16	0.9600
N1—C6	1.338 (10)	N21—C26	1.335 (10)
N1—C2	1.339 (10)	N21—C22	1.364 (10)
C2—C3	1.410 (11)	C22—C23	1.387 (11)
C2—C12	1.470 (11)	C23—C24	1.336 (15)
C3—C4	1.354 (14)	C23—H23	0.9600
C3—H3	0.9600	C24—C25	1.357 (16)
C4—C5	1.410 (14)	C24—H24	0.9599
C4—H4	0.9600	C25—C26	1.393 (14)
C5—C6	1.396 (11)	C25—H25	0.9599
C5—H5	0.9599	C26—H26	0.9600
C6—C22	1.469 (11)	Cl2—O3	1.400 (8)
N11—C16	1.346 (10)	Cl2—O1	1.417 (8)
N11—C12	1.372 (10)	Cl2—O4	1.427 (9)
C12—C13	1.383 (11)	Cl2—O2	1.430 (10)
C13—C14	1.393 (14)

N1—Cu—N21	80.3 (3)	C12—C13—H13	119.7
N1—Cu—N11	80.7 (3)	C14—C13—H13	120.0
N21—Cu—N11	158.8 (3)	C15—C14—C13	118.4 (8)
N1—Cu—Cl1	174.9 (2)	C15—C14—H14	121.0
N21—Cu—Cl1	99.6 (2)	C13—C14—H14	120.6
N11—Cu—Cl1	98.5 (2)	C14—C15—C16	119.9 (9)
N1—Cu—Cl1ⁱ	93.2 (2)	C14—C15—H15	119.9
N21—Cu—Cl1ⁱ	97.7 (2)	C16—C15—H15	120.1
N11—Cu—Cl1ⁱ	92.67 (19)	N11—C16—C15	122.9 (9)
Cl1—Cu—Cl1ⁱ	91.80 (7)	N11—C16—H16	118.3
Cu—Cl1—Cuⁱ	88.20 (7)	C15—C16—H16	118.9
C6—N1—C2	123.8 (7)	C26—N21—C22	117.9 (7)
C6—N1—Cu	118.0 (5)	C26—N21—Cu	127.7 (6)
C2—N1—Cu	118.2 (5)	C22—N21—Cu	114.3 (5)
N1—C2—C3	118.0 (8)	N21—C22—C23	121.4 (8)
N1—C2—C12	113.2 (6)	N21—C22—C6	113.5 (6)
C3—C2—C12	128.8 (8)	C23—C22—C6	124.9 (8)
C4—C3—C2	120.7 (9)	C24—C23—C22	119.2 (9)
C4—C3—H3	119.9	C24—C23—H23	120.7
C2—C3—H3	119.4	C22—C23—H23	120.1
C3—C4—C5	119.4 (8)	C23—C24—C25	120.7 (9)
C3—C4—H4	120.2	C23—C24—H24	119.7
C5—C4—H4	120.4	C25—C24—H24	119.6
C6—C5—C4	118.8 (8)	C24—C25—C26	118.8 (10)
C6—C5—H5	120.3	C24—C25—H25	120.5
C4—C5—H5	120.9	C26—C25—H25	120.7
N1—C6—C5	119.2 (8)	N21—C26—C25	121.8 (9)
N1—C6—C22	113.4 (7)	N21—C26—H26	118.8
C5—C6—C22	127.3 (8)	C25—C26—H26	119.4
C16—N11—C12	118.0 (7)	O3—Cl2—O1	110.1 (6)
C16—N11—Cu	128.7 (6)	O3—Cl2—O4	109.9 (6)
C12—N11—Cu	112.9 (5)	O1—Cl2—O4	109.8 (6)
N11—C12—C13	120.5 (8)	O3—Cl2—O2	108.7 (6)
N11—C12—C2	114.4 (7)	O1—Cl2—O2	107.9 (6)
C13—C12—C2	125.1 (8)	O4—Cl2—O2	110.5 (6)
C12—C13—C14	120.3 (9)

N21—Cu—Cl1—Cuⁱ	−98.1 (2)	N1—C2—C12—N11	5.0 (10)
N11—Cu—Cl1—Cuⁱ	92.97 (19)	C3—C2—C12—N11	−174.1 (7)
Cl1ⁱ—Cu—Cl1—Cuⁱ	0.0	N1—C2—C12—C13	−174.5 (8)
N21—Cu—N1—C6	5.3 (6)	C3—C2—C12—C13	6.3 (14)
N11—Cu—N1—C6	175.9 (6)	N11—C12—C13—C14	1.2 (14)
Cl1ⁱ—Cu—N1—C6	−92.0 (6)	C2—C12—C13—C14	−179.3 (9)
N21—Cu—N1—C2	−174.9 (6)	C12—C13—C14—C15	0.4 (16)
N11—Cu—N1—C2	−4.4 (6)	C13—C14—C15—C16	−1.1 (16)
Cl1ⁱ—Cu—N1—C2	87.8 (6)	C12—N11—C16—C15	1.2 (13)
C6—N1—C2—C3	0.1 (11)	Cu—N11—C16—C15	−170.7 (7)
Cu—N1—C2—C3	−179.7 (5)	C14—C15—C16—N11	0.3 (16)
C6—N1—C2—C12	−179.2 (7)	N1—Cu—N21—C26	176.4 (8)
Cu—N1—C2—C12	1.0 (9)	N11—Cu—N21—C26	149.9 (8)
N1—C2—C3—C4	−0.9 (12)	Cl1—Cu—N21—C26	1.6 (8)
C12—C2—C3—C4	178.2 (8)	Cl1ⁱ—Cu—N21—C26	−91.6 (8)
C2—C3—C4—C5	2.3 (14)	N1—Cu—N21—C22	−6.5 (6)
C3—C4—C5—C6	−2.9 (14)	N11—Cu—N21—C22	−33.1 (12)
C2—N1—C6—C5	−0.7 (12)	Cl1—Cu—N21—C22	178.6 (6)
Cu—N1—C6—C5	179.1 (6)	Cl1ⁱ—Cu—N21—C22	85.4 (6)
C2—N1—C6—C22	177.1 (7)	C26—N21—C22—C23	0.1 (13)
Cu—N1—C6—C22	−3.2 (9)	Cu—N21—C22—C23	−177.2 (7)
C4—C5—C6—N1	2.0 (13)	C26—N21—C22—C6	−176.0 (8)
C4—C5—C6—C22	−175.4 (9)	Cu—N21—C22—C6	6.7 (9)
N1—Cu—N11—C16	179.2 (8)	N1—C6—C22—N21	−2.5 (11)
N21—Cu—N11—C16	−154.3 (8)	C5—C6—C22—N21	175.1 (9)
Cl1—Cu—N11—C16	−5.9 (7)	N1—C6—C22—C23	−178.4 (8)
Cl1ⁱ—Cu—N11—C16	86.4 (7)	C5—C6—C22—C23	−0.9 (15)
N1—Cu—N11—C12	7.0 (5)	N21—C22—C23—C24	1.6 (15)
N21—Cu—N11—C12	33.5 (11)	C6—C22—C23—C24	177.3 (10)
Cl1—Cu—N11—C12	−178.1 (5)	C22—C23—C24—C25	−4.1 (18)
Cl1ⁱ—Cu—N11—C12	−85.9 (5)	C23—C24—C25—C26	4.8 (19)
C16—N11—C12—C13	−1.9 (12)	C22—N21—C26—C25	0.6 (14)
Cu—N11—C12—C13	171.2 (7)	Cu—N21—C26—C25	177.5 (8)
C16—N11—C12—C2	178.5 (7)	C24—C25—C26—N21	−3.0 (17)
Cu—N11—C12—C2	−8.4 (8)

Symmetry code: (i) −x, −y, −z.

Experimental details

Crystal data
Chemical formula	[Cu₂Cl₂(C₁₅H₁₁N₃)₂](ClO₄)₂
M_r	863.42
Crystal system, space group	Monoclinic, P2₁/n
Temperature (K)	293
a, b, c (Å)	7.439 (1), 24.387 (4), 9.196 (1)
β (°)	105.76 (1)
V (Å³)	1605.6 (4)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	1.72
Crystal size (mm)	0.32 × 0.20 × 0.18

Data collection
Diffractometer	Siemens P4/PC diffractometer
Absorption correction	ψ scan (North et al., 1968)
T_min, T_max	0.435, 0.533
No. of measured, independent and observed [I > 2σ(I)] reflections	3043, 2818, 1856
R_int	0.078
(sin θ/λ)_max (Å⁻¹)	0.595

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.060, 0.173, 1.07
No. of reflections	2818
No. of parameters	227
H-atom treatment	H-atom parameters not refined
Δρ_max, Δρ_min (e Å⁻³)	0.46, −0.65

Computer programs: XSCANS (Siemens, 1993), XSCANS, SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), PLATON (Spek, 1999) and Mercury (Version 1.1; Bruno et al., 2002), SHELXL97 and PLATON (Spek, 1999).

Selected geometric parameters (Å, º) top

Cu—N1	1.938 (6)	Cu—Cl1	2.227 (2)
Cu—N21	2.008 (6)	Cu—Cl1ⁱ	2.698 (2)
Cu—N11	2.028 (6)

N1—Cu—N21	80.3 (3)	N11—Cu—Cl1	98.5 (2)
N1—Cu—N11	80.7 (3)	N1—Cu—Cl1ⁱ	93.2 (2)
N21—Cu—N11	158.8 (3)	Cl1—Cu—Cl1ⁱ	91.80 (7)
N1—Cu—Cl1	174.9 (2)	Cu—Cl1—Cuⁱ	88.20 (7)
N21—Cu—Cl1	99.6 (2)

N1—C2—C12—N11	5.0 (10)	N1—C6—C22—N21	−2.5 (11)

Symmetry code: (i) −x, −y, −z.

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