metal-organic compounds
Bis(4,7-dichloro-1,10-phenanthroline-κ2N,N′)bis(dicyanamido-κN)copper(II)
aDepartment of Inorganic Chemistry, Faculty of Science, P.J. Šafárik University, Moyzesova 11, SK-041 54 Košice, Slovakia, and bDepartment of Inorganic Chemistry, Faculty of Science, Palacký University, Tř. 17. listopadu 12, CZ-77146 Olomouc, Czech Republic
*Correspondence e-mail: ivan.potocnak@upjs.sk
In the title compound, [Cu(C2N3)2(C12H6Cl2N2)2], the CuII atom is coordinated by two chelating 4,7-dichloro-1,10-phenanthroline (4,7-Cl-phen) ligands and two dicyanamide (dca) ligands in a cis arrangement, forming a distorted octahedral geometry. The equatorial plane is occupied by three N atoms from two 4,7-Cl-phen ligands and one N atom from a dca ligand at shorter Cu—N distances. Due to the Jahn–Teller effect, the axial positions are occupied by a 4,7-Cl-phen N atom and a dca N atom at longer Cu—N distances. The dca ligands are nearly planar, with a maximum deviations of 0.006 (1) Å. The is stabilized by weak C—H⋯N hydrogen bonds, with cyanide N atoms as acceptors, and π–π interactions between adjacent phenyl rings [centroid–centroid distance = 3.725 (3) Å].
Related literature
For long-range magnetic ordering in M(dca)2 compounds, see: Batten & Murray (2003); Kurmoo & Kepert (1998). For penta-coordinated Cu(II) in [Cu(L)2dca]Y complexes [L = 1,10-phenanthroline (phen) and 2,2′-bipyridine (bpy), Y = a monovalent anion], see: Potočňák et al. (2005, 2008). For related structures of [M(phen)2(dca)2] compounds, see: Lan et al. (2005) (M = Cd); Potočňák et al. (1995) (M = Cu); Wang et al. (2000) (M = Mn and Zn); Wu et al. (2004) (M = Ni). For typical N—Csp bond lengths, see: Jolly (1991). For π–π interactions, see: Janiak (2000).
Experimental
Crystal data
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Refinement
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Data collection: CrysAlis CCD (Oxford Diffraction, 2006); cell CrysAlis RED (Oxford Diffraction, 2006); data reduction: CrysAlis RED; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1999); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536810019847/hy2310sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810019847/hy2310Isup2.hkl
The title compound was prepared by chance during our attempts to prepare [Cu(4,7-Cl-phen)2(dca)]NO3 compound with a penta-coordinated CuII atom. Crystals of the title compound were prepared by mixing a 0.1 M aqueous solution of Cu(NO3)2 (1 mmol, 10 ml) with a 0.1 M ethanolic solution of 4,7-Cl-phen (2 mmol, 20 ml). To the resulting dark green solution, a 0.1 M aqueous solution of NaN(CN)2 (1 mmol, 10 ml) was added (all solutions were warmed before mixing). After few days, dark green crystals were filtered off and dried in air.
H atom were positioned geometrically and refined as riding atoms, with C—H = 0.93 Å and Uiso(H) = 1.2Ueq(C).
Nowadays, there is increasing interest in the synthesis and characterization of new coordination compounds due to their fascinating structural features. Among the various classes of ligands currently employed for the generation of coordination compounds, dicyanamide (dca) has been attracting a lot of attention, partly due to the discovery of long-range magnetic ordering in the M(dca)2 compounds (Batten & Murray, 2003; Kurmoo & Kepert, 1998). A particular feature of this ligand is the variability in coordination modes it can display and thus it is able to generate one- to three-dimensional networks, as well as molecular and ionic compounds, depending on its metallic centers and its organic coligands. In our previous work with pseudohalides we have used dca and nitrosodicyanomethanide within our study on the spectral–structural correlations of penta-coordinated [Cu(L)2dca]Y complexes [L = 1,10-phenanthroline (phen) and 2,2'-bipyridine (bpy), Y = a monovalent anion] (Potočňák et al., 2005, 2008). With the aim to continue in this work we used 4,7-dichloro-1,10-phenanthroline (4,7-Cl-phen) in our synthesis and here we present the structure of accidentally prepared the title compound.
The title compound is formed by discrete molecules (Fig. 1) held together by weak hydrogen bonds and π–π interactions. The CuII atom is coordinated by two chelating 4,7-Cl-phen molecules and by two dicyanamide ligands in a cis arrangement, forming a distorted octahedral geometry. Similar cis coordination of two dca ligands was observed in [M(phen)2(dca)2] compounds with M = Ni (Wu et al., 2004), Cd (Lan et al., 2005), Mn and Zn (Wang et al., 2000) and Cu (Potočňák et al., 1995), which are mutually isostructural. The equatorial plane in the title compound is occupied by three N atoms of two 4,7-Cl-phen molecules with Cu—N distances between 2.0267 (17) and 2.0575 (17) Å while the fourth position is occupied by N1 atom of dca at a shorter distance of 1.9707 (18) Å (Table 1). Due to Jahn-Teller effect the axial positions are occupied at longer distances [Cu1—N4 = 2.2863 (19) and Cu1—N20 = 2.3715 (17) Å]. The two dca ligands are perfectly planar, with the largest deviation of atoms from the mean planes being 0.006 (1) Å. All Ncyanide≡C distances [1.147 (6) Å in average] are usual for triple N≡C bond (1.15 Å) whereas Namide—C distances [1.303 (10) Å in average] are slightly shorter than typical N—Csp bond (1.35 Å) (Jolly, 1991). The bond angles around cyanide C atoms are, as expected, nearly linear [175 (2)° in average] and the angles around amide N atoms are consistent with sp2 [121 (5)° in average]. All mentioned values of bonds and angles are close to the values observed in the above mentioned [M(phen)2(dca)2] compounds. Aromatic rings of two 4,7-Cl-phen molecules are nearly planar; the largest deviation of atoms from their mean planes is 0.095 (1) Å and the bond distances and angles (including Cl atoms) are normal.
The structure of the title compound is stabilized by weak C—H···N hydrogen bonds with cyanide N atoms of the dca ligands as acceptors (Table 2). The next stabilization comes from face to face π–π interactions (Janiak, 2000) between parallel phenyl rings of two adjacent 4,7-Cl-phen molecules (Fig. 2) as evidenced by the distance of Cg(phenyl)···Cg(phenyl)i = 3.725 (3) Å and by the angle between phenyl ring normal and vector connecting Cg and Cgi of 18.5° [symmetry code: (i) = 1-x, 1-y, -z].
For long-range magnetic ordering in M(dca)2 compounds, see: Batten & Murray (2003); Kurmoo & Kepert (1998). For penta-coordinated [Cu(L)2dca]Y complexes [L = 1,10-phenanthroline (phen) and 2,2'-bipyridine (bpy), Y = a monovalent anion], see: Potočňák et al. (2005, 2008). For related structures of [M(phen)2(dca)2] compounds, see: Lan et al. (2005) (M = Cd); Potočňák et al. (1995) (M = Cu); Wang et al. (2000) (M = Mn and Zn); Wu et al. (2004) (M = Ni). For the typical N—Csp bond length, see: Jolly (1991). For π–π interactions, see: Janiak (2000).
Data collection: CrysAlis CCD (Oxford Diffraction, 2006); cell
CrysAlis RED (Oxford Diffraction, 2006); data reduction: CrysAlis RED (Oxford Diffraction, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1999); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).[Cu(C2N3)2(C12H6Cl2N2)2] | F(000) = 1388 |
Mr = 693.82 | Dx = 1.671 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 18055 reflections |
a = 9.5484 (2) Å | θ = 2.6–32.0° |
b = 16.6471 (3) Å | µ = 1.22 mm−1 |
c = 17.4906 (3) Å | T = 110 K |
β = 97.316 (2)° | Prism, dark green |
V = 2757.55 (9) Å3 | 0.30 × 0.25 × 0.20 mm |
Z = 4 |
Oxford Diffraction CCD diffractometer | 5408 independent reflections |
Radiation source: Enhance Mo X-ray Source | 4583 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.018 |
Detector resolution: 8.3611 pixels mm-1 | θmax = 26.0°, θmin = 2.6° |
Rotation method data acquisition using ω scans | h = −11→11 |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2006) | k = −20→17 |
Tmin = 0.711, Tmax = 0.792 | l = −20→21 |
24411 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)] = 0.031 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.082 | H-atom parameters constrained |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0472P)2 + 1.3402P] where P = (Fo2 + 2Fc2)/3 |
5408 reflections | (Δ/σ)max = 0.001 |
388 parameters | Δρmax = 0.64 e Å−3 |
0 restraints | Δρmin = −0.23 e Å−3 |
[Cu(C2N3)2(C12H6Cl2N2)2] | V = 2757.55 (9) Å3 |
Mr = 693.82 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 9.5484 (2) Å | µ = 1.22 mm−1 |
b = 16.6471 (3) Å | T = 110 K |
c = 17.4906 (3) Å | 0.30 × 0.25 × 0.20 mm |
β = 97.316 (2)° |
Oxford Diffraction CCD diffractometer | 5408 independent reflections |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2006) | 4583 reflections with I > 2σ(I) |
Tmin = 0.711, Tmax = 0.792 | Rint = 0.018 |
24411 measured reflections |
R[F2 > 2σ(F2)] = 0.031 | 0 restraints |
wR(F2) = 0.082 | H-atom parameters constrained |
S = 1.06 | Δρmax = 0.64 e Å−3 |
5408 reflections | Δρmin = −0.23 e Å−3 |
388 parameters |
x | y | z | Uiso*/Ueq | ||
Cu1 | 0.73584 (2) | 0.244567 (14) | 0.074294 (14) | 0.01736 (8) | |
N10 | 0.65586 (17) | 0.34366 (10) | 0.12412 (10) | 0.0201 (4) | |
N20 | 0.81350 (18) | 0.35667 (10) | 0.00736 (10) | 0.0204 (4) | |
Cl1 | 0.44014 (7) | 0.55644 (4) | 0.21633 (4) | 0.04029 (16) | |
Cl2 | 0.85895 (7) | 0.58898 (4) | −0.11851 (4) | 0.04439 (18) | |
C11 | 0.6665 (2) | 0.41712 (12) | 0.09164 (11) | 0.0190 (4) | |
C12 | 0.5825 (2) | 0.33722 (14) | 0.18341 (13) | 0.0255 (5) | |
H12 | 0.5760 | 0.2870 | 0.2061 | 0.031* | |
C13 | 0.5150 (2) | 0.40176 (14) | 0.21322 (13) | 0.0295 (5) | |
H13 | 0.4644 | 0.3948 | 0.2548 | 0.035* | |
C14 | 0.5242 (2) | 0.47530 (14) | 0.18044 (13) | 0.0277 (5) | |
C15 | 0.6010 (2) | 0.48611 (13) | 0.11737 (12) | 0.0233 (5) | |
C16 | 0.6149 (3) | 0.56097 (13) | 0.07980 (14) | 0.0313 (5) | |
H16 | 0.5720 | 0.6064 | 0.0972 | 0.038* | |
C21 | 0.7488 (2) | 0.42388 (12) | 0.02814 (11) | 0.0199 (4) | |
C22 | 0.8939 (2) | 0.36242 (14) | −0.04874 (12) | 0.0246 (5) | |
H22 | 0.9409 | 0.3167 | −0.0623 | 0.030* | |
C23 | 0.9115 (2) | 0.43357 (14) | −0.08856 (13) | 0.0287 (5) | |
H23 | 0.9685 | 0.4352 | −0.1279 | 0.034* | |
C24 | 0.8431 (2) | 0.50057 (14) | −0.06831 (13) | 0.0285 (5) | |
C25 | 0.7597 (2) | 0.49893 (13) | −0.00764 (12) | 0.0249 (5) | |
C26 | 0.6891 (3) | 0.56708 (13) | 0.01959 (14) | 0.0322 (5) | |
H26 | 0.6946 | 0.6164 | −0.0048 | 0.039* | |
N30 | 0.84783 (17) | 0.16751 (10) | 0.01434 (9) | 0.0171 (3) | |
N40 | 0.92200 (17) | 0.24532 (9) | 0.14439 (10) | 0.0167 (3) | |
Cl3 | 1.15245 (6) | 0.02029 (3) | −0.10381 (3) | 0.02774 (13) | |
Cl4 | 1.35419 (5) | 0.22801 (4) | 0.27827 (3) | 0.02713 (13) | |
C31 | 0.9859 (2) | 0.16187 (11) | 0.04440 (11) | 0.0160 (4) | |
C32 | 0.8057 (2) | 0.12642 (12) | −0.04913 (11) | 0.0195 (4) | |
H32 | 0.7110 | 0.1289 | −0.0696 | 0.023* | |
C33 | 0.8970 (2) | 0.07940 (12) | −0.08686 (12) | 0.0211 (4) | |
H33 | 0.8634 | 0.0508 | −0.1311 | 0.025* | |
C34 | 1.0362 (2) | 0.07628 (12) | −0.05764 (12) | 0.0199 (4) | |
C35 | 1.0863 (2) | 0.11723 (12) | 0.01083 (11) | 0.0185 (4) | |
C36 | 1.2283 (2) | 0.11490 (13) | 0.04832 (12) | 0.0227 (4) | |
H36 | 1.2964 | 0.0868 | 0.0256 | 0.027* | |
C41 | 1.0252 (2) | 0.20322 (11) | 0.11568 (11) | 0.0154 (4) | |
C42 | 0.9524 (2) | 0.27980 (12) | 0.21246 (11) | 0.0199 (4) | |
H42 | 0.8820 | 0.3086 | 0.2325 | 0.024* | |
C43 | 1.0851 (2) | 0.27489 (13) | 0.25544 (12) | 0.0214 (4) | |
H43 | 1.1023 | 0.2990 | 0.3037 | 0.026* | |
C44 | 1.1897 (2) | 0.23404 (12) | 0.22564 (12) | 0.0197 (4) | |
C45 | 1.1636 (2) | 0.19653 (12) | 0.15307 (11) | 0.0176 (4) | |
C46 | 1.2653 (2) | 0.15285 (13) | 0.11640 (12) | 0.0226 (4) | |
H46 | 1.3584 | 0.1504 | 0.1396 | 0.027* | |
C1 | 0.4712 (2) | 0.22929 (13) | −0.04859 (13) | 0.0232 (5) | |
N1 | 0.56293 (19) | 0.23404 (11) | 0.00040 (11) | 0.0258 (4) | |
N2 | 0.3809 (2) | 0.22103 (17) | −0.10946 (12) | 0.0451 (6) | |
C3 | 0.2472 (2) | 0.23853 (13) | −0.11338 (12) | 0.0233 (5) | |
N3 | 0.1290 (2) | 0.25177 (13) | −0.12394 (12) | 0.0348 (5) | |
C4 | 0.6328 (2) | 0.10062 (14) | 0.19498 (13) | 0.0251 (5) | |
N4 | 0.6632 (2) | 0.15641 (12) | 0.16144 (11) | 0.0299 (4) | |
N5 | 0.6030 (2) | 0.03864 (12) | 0.23565 (12) | 0.0361 (5) | |
C6 | 0.4981 (3) | −0.00718 (14) | 0.20559 (14) | 0.0352 (6) | |
N6 | 0.4072 (3) | −0.04946 (14) | 0.18408 (16) | 0.0607 (8) |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cu1 | 0.01357 (13) | 0.01900 (14) | 0.01928 (14) | 0.00215 (9) | 0.00121 (10) | −0.00168 (10) |
N10 | 0.0195 (9) | 0.0188 (9) | 0.0220 (9) | 0.0018 (7) | 0.0030 (7) | 0.0003 (7) |
N20 | 0.0201 (9) | 0.0234 (9) | 0.0171 (9) | 0.0008 (7) | 0.0004 (7) | 0.0003 (7) |
Cl1 | 0.0458 (4) | 0.0343 (3) | 0.0409 (4) | 0.0157 (3) | 0.0060 (3) | −0.0142 (3) |
Cl2 | 0.0578 (4) | 0.0363 (3) | 0.0376 (3) | −0.0181 (3) | 0.0007 (3) | 0.0157 (3) |
C11 | 0.0166 (10) | 0.0195 (10) | 0.0195 (10) | 0.0006 (8) | −0.0028 (8) | −0.0009 (8) |
C12 | 0.0264 (11) | 0.0251 (11) | 0.0266 (12) | 0.0005 (9) | 0.0100 (9) | 0.0005 (9) |
C13 | 0.0296 (12) | 0.0324 (13) | 0.0286 (12) | 0.0011 (10) | 0.0114 (10) | −0.0058 (10) |
C14 | 0.0256 (11) | 0.0289 (12) | 0.0278 (12) | 0.0080 (9) | 0.0002 (9) | −0.0107 (10) |
C15 | 0.0235 (11) | 0.0207 (11) | 0.0239 (11) | 0.0027 (9) | −0.0041 (9) | −0.0045 (9) |
C16 | 0.0376 (13) | 0.0198 (11) | 0.0343 (13) | 0.0059 (10) | −0.0042 (11) | −0.0044 (10) |
C21 | 0.0178 (10) | 0.0213 (10) | 0.0190 (10) | −0.0014 (8) | −0.0037 (8) | 0.0003 (8) |
C22 | 0.0219 (11) | 0.0333 (12) | 0.0179 (10) | −0.0009 (9) | −0.0006 (9) | 0.0001 (9) |
C23 | 0.0269 (12) | 0.0404 (14) | 0.0183 (11) | −0.0100 (10) | 0.0014 (9) | 0.0032 (10) |
C24 | 0.0317 (12) | 0.0290 (12) | 0.0228 (11) | −0.0126 (10) | −0.0049 (9) | 0.0078 (9) |
C25 | 0.0266 (11) | 0.0231 (11) | 0.0223 (11) | −0.0042 (9) | −0.0068 (9) | 0.0026 (9) |
C26 | 0.0421 (14) | 0.0187 (11) | 0.0330 (13) | −0.0019 (10) | −0.0056 (11) | 0.0040 (10) |
N30 | 0.0170 (8) | 0.0166 (8) | 0.0171 (8) | 0.0007 (7) | 0.0006 (7) | 0.0019 (7) |
N40 | 0.0173 (8) | 0.0164 (8) | 0.0165 (8) | −0.0003 (6) | 0.0030 (7) | 0.0023 (7) |
Cl3 | 0.0304 (3) | 0.0281 (3) | 0.0261 (3) | 0.0076 (2) | 0.0089 (2) | −0.0045 (2) |
Cl4 | 0.0191 (3) | 0.0393 (3) | 0.0212 (3) | −0.0046 (2) | −0.0043 (2) | 0.0036 (2) |
C31 | 0.0159 (9) | 0.0151 (10) | 0.0168 (10) | −0.0004 (8) | 0.0017 (8) | 0.0038 (8) |
C32 | 0.0192 (10) | 0.0198 (10) | 0.0189 (10) | −0.0010 (8) | 0.0002 (8) | 0.0017 (8) |
C33 | 0.0280 (11) | 0.0185 (10) | 0.0166 (10) | −0.0023 (8) | 0.0024 (8) | 0.0002 (8) |
C34 | 0.0247 (11) | 0.0161 (10) | 0.0203 (10) | 0.0031 (8) | 0.0079 (8) | 0.0037 (8) |
C35 | 0.0203 (10) | 0.0157 (10) | 0.0197 (10) | 0.0001 (8) | 0.0038 (8) | 0.0034 (8) |
C36 | 0.0184 (10) | 0.0233 (11) | 0.0269 (11) | 0.0053 (8) | 0.0050 (9) | 0.0021 (9) |
C41 | 0.0166 (9) | 0.0144 (9) | 0.0154 (10) | −0.0012 (7) | 0.0033 (8) | 0.0043 (7) |
C42 | 0.0232 (10) | 0.0195 (10) | 0.0173 (10) | −0.0015 (8) | 0.0041 (8) | −0.0010 (8) |
C43 | 0.0258 (11) | 0.0225 (10) | 0.0157 (10) | −0.0057 (9) | 0.0013 (8) | 0.0012 (8) |
C44 | 0.0171 (10) | 0.0220 (10) | 0.0189 (10) | −0.0063 (8) | −0.0015 (8) | 0.0062 (8) |
C45 | 0.0167 (9) | 0.0169 (10) | 0.0189 (10) | −0.0022 (8) | 0.0016 (8) | 0.0049 (8) |
C46 | 0.0148 (10) | 0.0257 (11) | 0.0265 (11) | 0.0027 (8) | −0.0002 (8) | 0.0052 (9) |
C1 | 0.0180 (10) | 0.0276 (11) | 0.0252 (11) | 0.0034 (9) | 0.0071 (9) | 0.0000 (9) |
N1 | 0.0165 (9) | 0.0299 (10) | 0.0302 (10) | 0.0035 (7) | 0.0008 (8) | −0.0027 (8) |
N2 | 0.0204 (10) | 0.0888 (18) | 0.0253 (11) | 0.0133 (11) | −0.0003 (8) | −0.0157 (11) |
C3 | 0.0269 (12) | 0.0259 (11) | 0.0168 (11) | −0.0018 (9) | 0.0010 (9) | 0.0001 (8) |
N3 | 0.0189 (11) | 0.0511 (14) | 0.0326 (11) | 0.0036 (9) | −0.0041 (8) | 0.0005 (9) |
C4 | 0.0213 (11) | 0.0269 (12) | 0.0270 (12) | 0.0033 (9) | 0.0023 (9) | −0.0039 (10) |
N4 | 0.0246 (10) | 0.0295 (11) | 0.0366 (11) | −0.0012 (8) | 0.0081 (8) | 0.0041 (9) |
N5 | 0.0401 (12) | 0.0328 (11) | 0.0325 (11) | −0.0109 (9) | −0.0071 (9) | 0.0076 (9) |
C6 | 0.0446 (15) | 0.0224 (12) | 0.0347 (14) | −0.0047 (11) | −0.0094 (11) | 0.0068 (10) |
N6 | 0.0718 (18) | 0.0376 (14) | 0.0632 (17) | −0.0228 (13) | −0.0276 (14) | 0.0153 (12) |
Cu1—N1 | 1.9707 (19) | N30—C31 | 1.359 (2) |
Cu1—N40 | 2.0267 (17) | N40—C42 | 1.320 (3) |
Cu1—N30 | 2.0431 (16) | N40—C41 | 1.357 (2) |
Cu1—N10 | 2.0575 (17) | Cl3—C34 | 1.727 (2) |
Cu1—N4 | 2.2863 (19) | Cl4—C44 | 1.719 (2) |
Cu1—N20 | 2.3715 (17) | C31—C35 | 1.400 (3) |
N10—C12 | 1.328 (3) | C31—C41 | 1.432 (3) |
N10—C11 | 1.358 (3) | C32—C33 | 1.398 (3) |
N20—C22 | 1.324 (3) | C32—H32 | 0.9300 |
N20—C21 | 1.350 (3) | C33—C34 | 1.363 (3) |
Cl1—C14 | 1.729 (2) | C33—H33 | 0.9300 |
Cl2—C24 | 1.730 (2) | C34—C35 | 1.408 (3) |
C11—C15 | 1.408 (3) | C35—C36 | 1.429 (3) |
C11—C21 | 1.445 (3) | C36—C46 | 1.354 (3) |
C12—C13 | 1.388 (3) | C36—H36 | 0.9300 |
C12—H12 | 0.9300 | C41—C45 | 1.402 (3) |
C13—C14 | 1.359 (3) | C42—C43 | 1.391 (3) |
C13—H13 | 0.9300 | C42—H42 | 0.9300 |
C14—C15 | 1.412 (3) | C43—C44 | 1.366 (3) |
C15—C16 | 1.423 (3) | C43—H43 | 0.9300 |
C16—C26 | 1.346 (4) | C44—C45 | 1.408 (3) |
C16—H16 | 0.9300 | C45—C46 | 1.428 (3) |
C21—C25 | 1.407 (3) | C46—H46 | 0.9300 |
C22—C23 | 1.395 (3) | C1—N1 | 1.147 (3) |
C22—H22 | 0.9300 | C1—N2 | 1.289 (3) |
C23—C24 | 1.362 (3) | N2—C3 | 1.302 (3) |
C23—H23 | 0.9300 | C3—N3 | 1.142 (3) |
C24—C25 | 1.406 (3) | C4—N4 | 1.155 (3) |
C25—C26 | 1.432 (3) | C4—N5 | 1.305 (3) |
C26—H26 | 0.9300 | N5—C6 | 1.314 (3) |
N30—C32 | 1.322 (3) | C6—N6 | 1.143 (3) |
N1—Cu1—N40 | 173.85 (7) | C16—C26—C25 | 121.2 (2) |
N1—Cu1—N30 | 93.27 (7) | C16—C26—H26 | 119.4 |
N40—Cu1—N30 | 80.69 (6) | C25—C26—H26 | 119.4 |
N1—Cu1—N10 | 91.37 (7) | C32—N30—C31 | 117.75 (17) |
N40—Cu1—N10 | 94.76 (6) | C32—N30—Cu1 | 129.23 (13) |
N30—Cu1—N10 | 165.36 (7) | C31—N30—Cu1 | 112.97 (13) |
N1—Cu1—N4 | 94.60 (7) | C42—N40—C41 | 118.15 (17) |
N40—Cu1—N4 | 85.29 (7) | C42—N40—Cu1 | 128.54 (14) |
N30—Cu1—N4 | 99.33 (7) | C41—N40—Cu1 | 113.30 (13) |
N10—Cu1—N4 | 94.12 (7) | N30—C31—C35 | 123.84 (18) |
N1—Cu1—N20 | 91.99 (7) | N30—C31—C41 | 115.94 (17) |
N40—Cu1—N20 | 89.34 (6) | C35—C31—C41 | 120.20 (17) |
N30—Cu1—N20 | 91.36 (6) | N30—C32—C33 | 122.97 (19) |
N10—Cu1—N20 | 74.60 (6) | N30—C32—H32 | 118.5 |
N4—Cu1—N20 | 167.08 (6) | C33—C32—H32 | 118.5 |
C12—N10—C11 | 118.32 (18) | C34—C33—C32 | 118.78 (19) |
C12—N10—Cu1 | 121.83 (14) | C34—C33—H33 | 120.6 |
C11—N10—Cu1 | 119.57 (14) | C32—C33—H33 | 120.6 |
C22—N20—C21 | 117.89 (18) | C33—C34—C35 | 120.69 (18) |
C22—N20—Cu1 | 132.06 (15) | C33—C34—Cl3 | 119.97 (16) |
C21—N20—Cu1 | 109.68 (13) | C35—C34—Cl3 | 119.33 (15) |
N10—C11—C15 | 122.76 (19) | C31—C35—C34 | 115.91 (18) |
N10—C11—C21 | 117.96 (18) | C31—C35—C36 | 118.81 (18) |
C15—C11—C21 | 119.28 (18) | C34—C35—C36 | 125.26 (18) |
N10—C12—C13 | 123.2 (2) | C46—C36—C35 | 121.13 (19) |
N10—C12—H12 | 118.4 | C46—C36—H36 | 119.4 |
C13—C12—H12 | 118.4 | C35—C36—H36 | 119.4 |
C14—C13—C12 | 118.7 (2) | N40—C41—C45 | 123.67 (18) |
C14—C13—H13 | 120.6 | N40—C41—C31 | 116.63 (17) |
C12—C13—H13 | 120.6 | C45—C41—C31 | 119.66 (17) |
C13—C14—C15 | 120.8 (2) | N40—C42—C43 | 122.83 (19) |
C13—C14—Cl1 | 119.50 (18) | N40—C42—H42 | 118.6 |
C15—C14—Cl1 | 119.69 (18) | C43—C42—H42 | 118.6 |
C11—C15—C14 | 116.19 (19) | C44—C43—C42 | 118.91 (19) |
C11—C15—C16 | 119.7 (2) | C44—C43—H43 | 120.5 |
C14—C15—C16 | 124.1 (2) | C42—C43—H43 | 120.5 |
C26—C16—C15 | 121.1 (2) | C43—C44—C45 | 120.73 (19) |
C26—C16—H16 | 119.4 | C43—C44—Cl4 | 119.18 (16) |
C15—C16—H16 | 119.4 | C45—C44—Cl4 | 120.10 (16) |
N20—C21—C25 | 123.64 (19) | C41—C45—C44 | 115.67 (18) |
N20—C21—C11 | 117.06 (18) | C41—C45—C46 | 119.00 (18) |
C25—C21—C11 | 119.29 (19) | C44—C45—C46 | 125.33 (18) |
N20—C22—C23 | 123.4 (2) | C36—C46—C45 | 121.06 (18) |
N20—C22—H22 | 118.3 | C36—C46—H46 | 119.5 |
C23—C22—H22 | 118.3 | C45—C46—H46 | 119.5 |
C24—C23—C22 | 118.2 (2) | N1—C1—N2 | 172.2 (2) |
C24—C23—H23 | 120.9 | C1—N1—Cu1 | 172.76 (18) |
C22—C23—H23 | 120.9 | C1—N2—C3 | 124.6 (2) |
C23—C24—C25 | 121.1 (2) | N3—C3—N2 | 173.5 (2) |
C23—C24—Cl2 | 119.25 (18) | N4—C4—N5 | 177.2 (2) |
C25—C24—Cl2 | 119.61 (18) | C4—N4—Cu1 | 166.37 (18) |
C24—C25—C21 | 115.7 (2) | C4—N5—C6 | 116.7 (2) |
C24—C25—C26 | 124.9 (2) | N6—C6—N5 | 175.5 (3) |
C21—C25—C26 | 119.4 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
C12—H12···N4 | 0.93 | 2.49 | 3.143 (3) | 127 |
C22—H22···N3i | 0.93 | 2.46 | 3.304 (3) | 151 |
C32—H32···N6ii | 0.93 | 2.54 | 3.181 (3) | 126 |
C43—H43···N6iii | 0.93 | 2.53 | 3.107 (3) | 120 |
Symmetry codes: (i) x+1, y, z; (ii) −x+1, −y, −z; (iii) −x+3/2, y+1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | [Cu(C2N3)2(C12H6Cl2N2)2] |
Mr | 693.82 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 110 |
a, b, c (Å) | 9.5484 (2), 16.6471 (3), 17.4906 (3) |
β (°) | 97.316 (2) |
V (Å3) | 2757.55 (9) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 1.22 |
Crystal size (mm) | 0.30 × 0.25 × 0.20 |
Data collection | |
Diffractometer | Oxford Diffraction CCD |
Absorption correction | Multi-scan (CrysAlis RED; Oxford Diffraction, 2006) |
Tmin, Tmax | 0.711, 0.792 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 24411, 5408, 4583 |
Rint | 0.018 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.031, 0.082, 1.06 |
No. of reflections | 5408 |
No. of parameters | 388 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.64, −0.23 |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2006), CrysAlis RED (Oxford Diffraction, 2006), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), DIAMOND (Brandenburg, 1999).
Cu1—N1 | 1.9707 (19) | Cu1—N10 | 2.0575 (17) |
Cu1—N40 | 2.0267 (17) | Cu1—N4 | 2.2863 (19) |
Cu1—N30 | 2.0431 (16) | Cu1—N20 | 2.3715 (17) |
D—H···A | D—H | H···A | D···A | D—H···A |
C12—H12···N4 | 0.93 | 2.49 | 3.143 (3) | 127.4 |
C22—H22···N3i | 0.93 | 2.46 | 3.304 (3) | 151.1 |
C32—H32···N6ii | 0.93 | 2.54 | 3.181 (3) | 126.3 |
C43—H43···N6iii | 0.93 | 2.53 | 3.107 (3) | 120.2 |
Symmetry codes: (i) x+1, y, z; (ii) −x+1, −y, −z; (iii) −x+3/2, y+1/2, −z+1/2. |
Acknowledgements
This work was supported by the Slovak Grant Agency VEGA (grant No. 1/0079/08), the grants of the Slovak Research and Development Agency (Nos. APVV-VVCE-0058-07 and APVV-0006-07) and the Ministry of Education, Youth and Sports of the Czech Republic (MSM6198959218). ZP thanks Socrates-Erasmus for financial support and Palacký University for hospitality.
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Nowadays, there is increasing interest in the synthesis and characterization of new coordination compounds due to their fascinating structural features. Among the various classes of ligands currently employed for the generation of coordination compounds, dicyanamide (dca) has been attracting a lot of attention, partly due to the discovery of long-range magnetic ordering in the M(dca)2 compounds (Batten & Murray, 2003; Kurmoo & Kepert, 1998). A particular feature of this ligand is the variability in coordination modes it can display and thus it is able to generate one- to three-dimensional networks, as well as molecular and ionic compounds, depending on its metallic centers and its organic coligands. In our previous work with pseudohalides we have used dca and nitrosodicyanomethanide within our study on the spectral–structural correlations of penta-coordinated [Cu(L)2dca]Y complexes [L = 1,10-phenanthroline (phen) and 2,2'-bipyridine (bpy), Y = a monovalent anion] (Potočňák et al., 2005, 2008). With the aim to continue in this work we used 4,7-dichloro-1,10-phenanthroline (4,7-Cl-phen) in our synthesis and here we present the structure of accidentally prepared the title compound.
The title compound is formed by discrete molecules (Fig. 1) held together by weak hydrogen bonds and π–π interactions. The CuII atom is coordinated by two chelating 4,7-Cl-phen molecules and by two dicyanamide ligands in a cis arrangement, forming a distorted octahedral geometry. Similar cis coordination of two dca ligands was observed in [M(phen)2(dca)2] compounds with M = Ni (Wu et al., 2004), Cd (Lan et al., 2005), Mn and Zn (Wang et al., 2000) and Cu (Potočňák et al., 1995), which are mutually isostructural. The equatorial plane in the title compound is occupied by three N atoms of two 4,7-Cl-phen molecules with Cu—N distances between 2.0267 (17) and 2.0575 (17) Å while the fourth position is occupied by N1 atom of dca at a shorter distance of 1.9707 (18) Å (Table 1). Due to Jahn-Teller effect the axial positions are occupied at longer distances [Cu1—N4 = 2.2863 (19) and Cu1—N20 = 2.3715 (17) Å]. The two dca ligands are perfectly planar, with the largest deviation of atoms from the mean planes being 0.006 (1) Å. All Ncyanide≡C distances [1.147 (6) Å in average] are usual for triple N≡C bond (1.15 Å) whereas Namide—C distances [1.303 (10) Å in average] are slightly shorter than typical N—Csp bond (1.35 Å) (Jolly, 1991). The bond angles around cyanide C atoms are, as expected, nearly linear [175 (2)° in average] and the angles around amide N atoms are consistent with sp2 hybridization [121 (5)° in average]. All mentioned values of bonds and angles are close to the values observed in the above mentioned [M(phen)2(dca)2] compounds. Aromatic rings of two 4,7-Cl-phen molecules are nearly planar; the largest deviation of atoms from their mean planes is 0.095 (1) Å and the bond distances and angles (including Cl atoms) are normal.
The structure of the title compound is stabilized by weak C—H···N hydrogen bonds with cyanide N atoms of the dca ligands as acceptors (Table 2). The next stabilization comes from face to face π–π interactions (Janiak, 2000) between parallel phenyl rings of two adjacent 4,7-Cl-phen molecules (Fig. 2) as evidenced by the distance of Cg(phenyl)···Cg(phenyl)i = 3.725 (3) Å and by the angle between phenyl ring normal and vector connecting Cg and Cgi of 18.5° [symmetry code: (i) = 1-x, 1-y, -z].