Dichlorido(2,9-dieth­oxy-1,10-phenanthroline-κ²N,N′)zinc(II)

All non-H atoms except for the Cl atoms lie on a mirror plane in the title complex, [ZnCl₂(C₁₆H₁₆N₂O₂)]. The Zn^II ion is coordinated by two N atoms from a bis-chelating 2,9-dieth­oxy-1,10-phenanthroline ligand and two symmetry-related Cl atoms in a distorted tetra­hedral environment. The two Zn—N bond lengths are significantly different from each other and the N—Zn—N angle is acute. In the crystal structure, there are weak but significant π–π stacking inter­actions between phenanthroline rings, with a centroid–centroid distance of 3.764 (1) Å.

Key indicators

• Single-crystal X-ray study
• T = 291 K
• Mean [sigma](C-C) = 0.008 Å
• R factor = 0.048
• wR factor = 0.089
• Data-to-parameter ratio = 12.8

checkCIF/PLATON results

No syntax errors found



Alert level C
PLAT220_ALERT_2_C Large Non-Solvent    C     Ueq(max)/Ueq(min) ...       2.51 Ratio
PLAT242_ALERT_2_C Check Low       Ueq as Compared to Neighbors for        C13
PLAT341_ALERT_3_C Low Bond Precision on C-C Bonds (x 1000) Ang ...          8
PLAT152_ALERT_1_C Supplied and Calc Volume s.u. Inconsistent .....          ?
PLAT790_ALERT_4_C Centre of Gravity not Within Unit Cell: Resd.  #          1
              C16 H16 Cl2 N2 O2 Zn

Alert level G
PLAT062_ALERT_4_G Rescale T(min) & T(max) by .....................       0.98

   0 ALERT level A = In general: serious problem
   0 ALERT level B = Potentially serious problem
   5 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
   2 ALERT type 2 Indicator that the structure model may be wrong or deficient
   1 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

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S1. Comment

The compound 1,10-phenanthroline has been reported as used to synthesize some potential strong luminescent materials with d¹⁰ metals. It was predicted that the title compound which is composed of a derivative of 1,10-phenanthroline and a d¹⁰ metal would possess strong ligand to ligand or metal perturbed ligand to ligand emissions (Majumder et al., 2006; Bie, et al., 2006). The ligand 2,9-Diethoxy-1,10-phenanthroline as a derivative of 1,10-phenanthroline was synthesized at an earlier time and possesses antimycoplasmal activity in the presence of copper (Pijper, et al., 1984).

The title mononuclear zinc(II) complex is shown in Fig. 1. All non-hydrogen atoms, execpt for the Cl atoms, lie on a mirror plane. The Zn^II ion is four coordinated by two nitrogen atoms from the 1,10-phenanthroline ring system (N1 and N2) and two chlorine atoms [Cl1, Cl1ⁱ. Symmetry code: (i) x, -y + 1/2, z], defining a disotorted tetrahedral coordination environment. In the crystal structure there are weak but significant π–π stacking interactions between phenanthroline rings (Fig. 2) with a centroid-to-centroid distance of 3.764 (1) Å.

Related literature

For background information, see: Majumder et al. (2006); Bie et al. (2006). For synthetic details, see: Pijper et al. (1984).

S2. Experimental

The organic ligand 2,9-diethoxy-1,10-phenanthroline was prepared according to the procedure of literature (Pijper, et al., 1984). The slow evaporation of mixture of the ligand (0.024 g, 0.1 mmol) and zinc dichloride (0.014 g, 0.1 mmol) in 30 ml me thanol afforded suitable colourless block crystals in about 7 days (yield 60%).

S3. Refinement

Carbon-bound H atoms were positioned geometrically and refined using a riding model [C—H = 0.93 Å and U_iso(H) = 1.2 U_eq(C) for aromatic H atoms; C—H = 0.97 Å and U_iso(H) = 1.2 U_eq(C) for methylene H atoms; C—H = 0.96 Å and U_iso(H) = 1.5 U_eq(C) for methyl H atoms;]. The final difference Fourier map had a highest peak at 1.17 Å from atom Zn1 and a deepest hole at 1.04 Å from atom Zn1.

Computing details

Data collection: SMART (Siemens, 1996); cell refinement: SAINT (Siemens, 1994); data reduction: SAINT (Siemens, 1994); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXL97 (Sheldrick, 2008) and DIAMOND (Brandenburg, 2005); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures

	Fig. 1. The molecular structure of the title complex, showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level and H atoms are shown as small spheres of arbitrary radii. [Symmetry codes: (i) x, -y + 1/2, z.]
	Fig. 2. Part of the crystal structure showing a π–π interaction (purple dotted line). All H atoms have been omitted for clarity.

Dichlorido(2,9-diethoxy-1,10-phenanthroline-κ²N,N')zinc(II)

Crystal data

[ZnCl2(C16H16N2O2)]	F(000) = 824
Mr = 404.58	Dx = 1.524 Mg m^−3
Orthorhombic, Pnma	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ac 2n	Cell parameters from 398 reflections
a = 13.255 (3) Å	θ = 2–25.1°
b = 7.4403 (15) Å	µ = 1.71 mm^−1
c = 17.874 (4) Å	T = 291 K
V = 1762.7 (6) Å^3	Prismatic, colorless
Z = 4	0.20 × 0.18 × 0.17 mm

Data collection

Bruker APEX-II CCD detector diffractometer	1741 independent reflections
Radiation source: fine-focus sealed tube	1303 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.052
Detector resolution: 0 pixels mm^-1	θmax = 25.5°, θmin = 1.9°
Oscillation frames scans	h = −16→0
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	k = −8→8
Tmin = 0.727, Tmax = 0.760	l = −21→21
5148 measured reflections

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.048	Hydrogen site location: inferred from neighbouring sites
wR(F^2) = 0.089	H-atom parameters constrained
S = 1.08	w = 1/[σ^2(Fo^2) + (0.042P)^2] where P = (Fo^2 + 2Fc^2)/3
1741 reflections	(Δ/σ)max < 0.001
136 parameters	Δρmax = 0.34 e Å^−3
0 restraints	Δρmin = −0.58 e Å^−3

Special details

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 (Ų)

	x	y	z	Uiso*/Ueq	Occ. (<1)
Zn1	−0.76441 (4)	0.2500	0.40645 (3)	0.03224 (18)
Cl1	−0.72431 (7)	−0.00599 (12)	0.35222 (5)	0.0513 (3)
O1	−0.9753 (2)	0.2500	0.33493 (19)	0.0549 (10)
O2	−0.5679 (2)	0.2500	0.51182 (18)	0.0441 (9)
N1	−0.9098 (2)	0.2500	0.4479 (2)	0.0326 (9)
N2	−0.7355 (2)	0.2500	0.5230 (2)	0.0330 (9)
C1	−0.9938 (3)	0.2500	0.4084 (3)	0.0409 (12)
C2	−1.0897 (3)	0.2500	0.4426 (3)	0.0464 (14)
H2A	−1.1480	0.2500	0.4136	0.056*
C3	−1.0957 (4)	0.2500	0.5183 (3)	0.0512 (15)
H3A	−1.1585	0.2500	0.5415	0.061*
C4	−1.0068 (4)	0.2500	0.5625 (3)	0.0425 (13)
C5	−0.9155 (3)	0.2500	0.5242 (3)	0.0325 (11)
C6	−0.8217 (3)	0.2500	0.5640 (3)	0.0327 (11)
C7	−0.8228 (4)	0.2500	0.6423 (3)	0.0411 (12)
C8	−0.7279 (4)	0.2500	0.6775 (3)	0.0530 (14)
H8A	−0.7244	0.2500	0.7295	0.064*
C9	−0.6412 (4)	0.2500	0.6367 (3)	0.0489 (15)
H9A	−0.5787	0.2500	0.6604	0.059*
C10	−0.6474 (3)	0.2500	0.5576 (3)	0.0382 (13)
C11	−1.0056 (4)	0.2500	0.6427 (3)	0.0576 (16)
H11A	−1.0663	0.2500	0.6689	0.069*
C12	−0.9174 (4)	0.2500	0.6808 (3)	0.0537 (15)
H12A	−0.9183	0.2500	0.7329	0.064*
C13	−1.0535 (4)	0.2500	0.2795 (3)	0.0527 (15)
H13A	−1.0956	0.3561	0.2843	0.063*	0.50
H13B	−1.0956	0.1439	0.2843	0.063*	0.50
C14	−0.9988 (4)	0.2500	0.2065 (3)	0.081 (2)
H14A	−1.0468	0.2500	0.1663	0.122*
H14B	−0.9572	0.1446	0.2032	0.122*	0.50
H14C	−0.9572	0.3554	0.2032	0.122*	0.50
C15	−0.4675 (3)	0.2500	0.5431 (3)	0.0578 (17)
H15A	−0.4576	0.1442	0.5740	0.069*	0.50
H15B	−0.4576	0.3558	0.5740	0.069*	0.50
C16	−0.3943 (4)	0.2500	0.4794 (3)	0.0608 (17)
H16A	−0.3266	0.2500	0.4987	0.091*
H16B	−0.4046	0.3554	0.4494	0.091*	0.50
H16C	−0.4046	0.1446	0.4494	0.091*	0.50

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Zn1	0.0278 (3)	0.0404 (3)	0.0285 (3)	0.000	0.0007 (2)	0.000
Cl1	0.0576 (6)	0.0440 (6)	0.0523 (6)	0.0023 (5)	0.0032 (5)	−0.0099 (5)
O1	0.0288 (18)	0.102 (3)	0.034 (2)	0.000	−0.0083 (16)	0.000
O2	0.0246 (17)	0.070 (3)	0.038 (2)	0.000	−0.0068 (15)	0.000
N1	0.024 (2)	0.042 (3)	0.031 (2)	0.000	−0.0012 (17)	0.000
N2	0.030 (2)	0.040 (2)	0.029 (2)	0.000	−0.0015 (19)	0.000
C1	0.030 (2)	0.045 (3)	0.048 (3)	0.000	0.000 (3)	0.000
C2	0.023 (2)	0.064 (4)	0.052 (4)	0.000	−0.006 (2)	0.000
C3	0.030 (3)	0.058 (4)	0.065 (4)	0.000	0.013 (3)	0.000
C4	0.036 (3)	0.047 (3)	0.044 (3)	0.000	0.009 (2)	0.000
C5	0.030 (2)	0.030 (3)	0.037 (3)	0.000	0.008 (2)	0.000
C6	0.034 (3)	0.035 (3)	0.029 (3)	0.000	0.005 (2)	0.000
C7	0.052 (3)	0.044 (3)	0.027 (3)	0.000	0.002 (2)	0.000
C8	0.062 (4)	0.072 (4)	0.025 (3)	0.000	−0.009 (3)	0.000
C9	0.040 (3)	0.072 (4)	0.034 (3)	0.000	−0.009 (3)	0.000
C10	0.033 (3)	0.049 (4)	0.033 (3)	0.000	−0.006 (2)	0.000
C11	0.048 (3)	0.076 (5)	0.048 (4)	0.000	0.025 (3)	0.000
C12	0.054 (3)	0.077 (5)	0.029 (3)	0.000	0.008 (3)	0.000
C13	0.038 (3)	0.069 (4)	0.050 (4)	0.000	−0.017 (3)	0.000
C14	0.051 (4)	0.149 (7)	0.044 (4)	0.000	−0.013 (3)	0.000
C15	0.030 (3)	0.096 (5)	0.047 (4)	0.000	−0.011 (3)	0.000
C16	0.034 (3)	0.093 (5)	0.056 (4)	0.000	−0.003 (3)	0.000

Geometric parameters (Å, º)

Zn1—N1	2.065 (3)	C7—C8	1.406 (7)
Zn1—N2	2.118 (4)	C7—C12	1.431 (7)
Zn1—Cl1	2.2022 (10)	C8—C9	1.362 (7)
Zn1—Cl1^i	2.2022 (10)	C8—H8A	0.9300
O1—C1	1.336 (6)	C9—C10	1.415 (6)
O1—C13	1.434 (5)	C9—H9A	0.9300
O2—C10	1.335 (5)	C11—C12	1.353 (7)
O2—C15	1.443 (5)	C11—H11A	0.9300
N1—C1	1.318 (5)	C12—H12A	0.9300
N1—C5	1.366 (6)	C13—C14	1.493 (7)
N2—C10	1.322 (5)	C13—H13A	0.9700
N2—C6	1.358 (5)	C13—H13B	0.9700
C1—C2	1.410 (6)	C14—H14A	0.9600
C2—C3	1.356 (7)	C14—H14B	0.9600
C2—H2A	0.9300	C14—H14C	0.9600
C3—C4	1.418 (7)	C15—C16	1.496 (7)
C3—H3A	0.9300	C15—H15A	0.9700
C4—C5	1.390 (6)	C15—H15B	0.9700
C4—C11	1.434 (7)	C16—H16A	0.9600
C5—C6	1.433 (6)	C16—H16B	0.9600
C6—C7	1.400 (6)	C16—H16C	0.9600
N1—Zn1—N2	79.43 (13)	C7—C8—H8A	119.5
N1—Zn1—Cl1	112.53 (5)	C8—C9—C10	119.1 (5)
N2—Zn1—Cl1	112.90 (4)	C8—C9—H9A	120.5
N1—Zn1—Cl1^i	112.53 (5)	C10—C9—H9A	120.5
N2—Zn1—Cl1^i	112.90 (4)	N2—C10—O2	114.2 (4)
Cl1—Zn1—Cl1^i	119.74 (6)	N2—C10—C9	121.3 (4)
C1—O1—C13	123.1 (4)	O2—C10—C9	124.5 (4)
C10—O2—C15	119.3 (4)	C12—C11—C4	120.8 (5)
C1—N1—C5	119.2 (4)	C12—C11—H11A	119.6
C1—N1—Zn1	126.6 (3)	C4—C11—H11A	119.6
C5—N1—Zn1	114.2 (3)	C11—C12—C7	121.0 (5)
C10—N2—C6	119.4 (4)	C11—C12—H12A	119.5
C10—N2—Zn1	128.4 (3)	C7—C12—H12A	119.5
C6—N2—Zn1	112.3 (3)	O1—C13—C14	104.6 (4)
N1—C1—O1	111.8 (4)	O1—C13—H13A	110.8
N1—C1—C2	122.0 (5)	C14—C13—H13A	110.8
O1—C1—C2	126.3 (4)	O1—C13—H13B	110.8
C3—C2—C1	119.0 (5)	C14—C13—H13B	110.8
C3—C2—H2A	120.5	H13A—C13—H13B	108.9
C1—C2—H2A	120.5	C13—C14—H14A	109.5
C2—C3—C4	120.5 (5)	C13—C14—H14B	109.5
C2—C3—H3A	119.7	H14A—C14—H14B	109.5
C4—C3—H3A	119.7	C13—C14—H14C	109.5
C5—C4—C3	116.6 (5)	H14A—C14—H14C	109.5
C5—C4—C11	118.9 (5)	H14B—C14—H14C	109.5
C3—C4—C11	124.5 (5)	O2—C15—C16	107.6 (4)
N1—C5—C4	122.7 (4)	O2—C15—H15A	110.2
N1—C5—C6	116.6 (4)	C16—C15—H15A	110.2
C4—C5—C6	120.7 (5)	O2—C15—H15B	110.2
N2—C6—C7	123.3 (4)	C16—C15—H15B	110.2
N2—C6—C5	117.5 (4)	H15A—C15—H15B	108.5
C7—C6—C5	119.2 (4)	C15—C16—H16A	109.5
C6—C7—C8	116.0 (4)	C15—C16—H16B	109.5
C6—C7—C12	119.3 (5)	H16A—C16—H16B	109.5
C8—C7—C12	124.6 (5)	C15—C16—H16C	109.5
C9—C8—C7	121.0 (4)	H16A—C16—H16C	109.5
C9—C8—H8A	119.5	H16B—C16—H16C	109.5
N2—Zn1—N1—C1	180.0	C10—N2—C6—C7	0.000 (1)
Cl1—Zn1—N1—C1	−69.44 (5)	Zn1—N2—C6—C7	180.0
Cl1^i—Zn1—N1—C1	69.44 (5)	C10—N2—C6—C5	180.0
N2—Zn1—N1—C5	0.0	Zn1—N2—C6—C5	0.0
Cl1—Zn1—N1—C5	110.56 (5)	N1—C5—C6—N2	0.0
Cl1^i—Zn1—N1—C5	−110.56 (5)	C4—C5—C6—N2	180.0
N1—Zn1—N2—C10	180.0	N1—C5—C6—C7	180.000 (1)
Cl1—Zn1—N2—C10	69.87 (5)	C4—C5—C6—C7	0.000 (1)
Cl1^i—Zn1—N2—C10	−69.87 (5)	N2—C6—C7—C8	0.000 (1)
N1—Zn1—N2—C6	0.0	C5—C6—C7—C8	180.000 (1)
Cl1—Zn1—N2—C6	−110.13 (5)	N2—C6—C7—C12	180.000 (1)
Cl1^i—Zn1—N2—C6	110.13 (5)	C5—C6—C7—C12	0.000 (1)
C5—N1—C1—O1	180.0	C6—C7—C8—C9	0.000 (1)
Zn1—N1—C1—O1	0.0	C12—C7—C8—C9	180.000 (1)
C5—N1—C1—C2	0.0	C7—C8—C9—C10	0.000 (1)
Zn1—N1—C1—C2	180.0	C6—N2—C10—O2	180.0
C13—O1—C1—N1	180.0	Zn1—N2—C10—O2	0.0
C13—O1—C1—C2	0.0	C6—N2—C10—C9	0.000 (1)
N1—C1—C2—C3	0.000 (1)	Zn1—N2—C10—C9	180.0
O1—C1—C2—C3	180.0	C15—O2—C10—N2	180.0
C1—C2—C3—C4	0.000 (1)	C15—O2—C10—C9	0.000 (1)
C2—C3—C4—C5	0.000 (1)	C8—C9—C10—N2	0.000 (1)
C2—C3—C4—C11	180.000 (1)	C8—C9—C10—O2	180.000 (1)
C1—N1—C5—C4	0.000 (1)	C5—C4—C11—C12	0.000 (1)
Zn1—N1—C5—C4	180.0	C3—C4—C11—C12	180.000 (1)
C1—N1—C5—C6	180.0	C4—C11—C12—C7	0.000 (2)
Zn1—N1—C5—C6	0.0	C6—C7—C12—C11	0.000 (2)
C3—C4—C5—N1	0.0	C8—C7—C12—C11	180.000 (1)
C11—C4—C5—N1	180.0	C1—O1—C13—C14	180.0
C3—C4—C5—C6	180.0	C10—O2—C15—C16	180.0
C11—C4—C5—C6	0.000 (1)

Symmetry code: (i) x, −y+1/2, z.