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The title complex, [ZnI2(C12H18N2O)], is a mononuclear zinc(II) compound derived from the zwitterionic form of the Schiff base (E)-2-[(3-dimethyl­amino­propyl­imino)meth­yl]phenol. The ZnII atom is four-coordinated by the imine N and phenolate O atoms of the Schiff base ligand, and by two iodide ions in a tetra­hedral coordination geometry. In the crystal structure, mol­ecules are linked through inter­molecular N—H...O hydrogen bonds, forming chains running along the b axis.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536808023659/sj2522sup1.cif
Contains datablocks global, I

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S1600536808023659/sj2522Isup2.hkl
Contains datablock I

CCDC reference: 700402

Key indicators

  • Single-crystal X-ray study
  • T = 298 K
  • Mean [sigma](C-C) = 0.013 Å
  • R factor = 0.043
  • wR factor = 0.101
  • Data-to-parameter ratio = 22.2

checkCIF/PLATON results

No syntax errors found



Alert level C PLAT094_ALERT_2_C Ratio of Maximum / Minimum Residual Density .... 3.92 PLAT220_ALERT_2_C Large Non-Solvent C Ueq(max)/Ueq(min) ... 2.66 Ratio PLAT222_ALERT_3_C Large Non-Solvent H Ueq(max)/Ueq(min) ... 3.21 Ratio PLAT232_ALERT_2_C Hirshfeld Test Diff (M-X) I1 -- Zn1 .. 7.14 su PLAT242_ALERT_2_C Check Low Ueq as Compared to Neighbors for N2 PLAT342_ALERT_3_C Low Bond Precision on C-C Bonds (x 1000) Ang ... 13 PLAT062_ALERT_4_C Rescale T(min) & T(max) by ..................... 0.87 PLAT850_ALERT_4_C Check Flack Parameter Exact Value 0.00 and su .. 0.04
Alert level G ABSTM02_ALERT_3_G 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 0.869 Tmax scaled 0.402 Tmin scaled 0.375 REFLT03_ALERT_4_G Please check that the estimate of the number of Friedel pairs is correct. If it is not, please give the correct count in the _publ_section_exptl_refinement section of the submitted CIF. From the CIF: _diffrn_reflns_theta_max 27.00 From the CIF: _reflns_number_total 3669 Count of symmetry unique reflns 2013 Completeness (_total/calc) 182.27% TEST3: Check Friedels for noncentro structure Estimate of Friedel pairs measured 1656 Fraction of Friedel pairs measured 0.823 Are heavy atom types Z>Si present yes
0 ALERT level A = In general: serious problem 0 ALERT level B = Potentially serious problem 8 ALERT level C = Check and explain 2 ALERT level G = General alerts; check 0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data 4 ALERT type 2 Indicator that the structure model may be wrong or deficient 3 ALERT type 3 Indicator that the structure quality may be low 3 ALERT type 4 Improvement, methodology, query or suggestion 0 ALERT type 5 Informative message, check

Comment top

Schiff bases have widely been used as versatile ligands in coordination chemistry (Biswas et al., 2008; Wu et al., 2008; Kawamoto et al., 2008; Ali et al., 2008; Habibi et al., 2007), and their metal complexes are of great interest in many fields (Chen et al., 2008; Yuan et al., 2007; Tomat et al., 2007; Darensbourg & Frantz, 2007). Zinc(II) is an important element in biological systems and functions as the active site of hydrolytic enzymes, such as carboxypeptidase and carbonic anhydrase where it is in a hard-donor coordination environment of nitrogen and oxygen ligands (Lipscomb & Sträter, 1996). In this paper, a new zinc(II) complex, (I), Fig. 1, of the Schiff base ligand (E)-2-[(3-dimethylaminopropylimino)methyl]phenol has been synthesized and structurally characterized.

The ZnII atom in (I) is four-coordinated by the imine N and phenolate O atoms of the zwitterionic form of the Schiff base ligand, and by two I- ions, in a tetrahedral coordination geometry. The coordinate bond lengths (Table 1) are typical and comparable to the corresponding values observed in other similar zinc(II) Schiff base complexes (Zhu et al., 2007; Wei et al., 2007; Qiu, 2006a,b).

In the crystal structure, molecules are linked through intermolecular N–H···O hydrogen bonds (Table 2), forming chains running along the b axis (Fig. 2).

Related literature top

For background to the chemistry of Schiff base complexes, see: Ali et al. (2008); Biswas et al. (2008); Chen et al. (2008); Darensbourg & Frantz (2007); Habibi et al. (2007); Kawamoto et al. (2008); Lipscomb & Sträter (1996); Tomat et al. (2007); Wu et al. (2008); Yuan et al. (2007). For related structures, see: Qiu (2006a,b); Wei et al. (2007); Zhu et al. (2007).

Experimental top

The Schiff base compound was prepared by the condensation of equimolar amounts of salicylaldehyde with N,N-dimethylpropane-1,3-diamine in a methanol solution. The complex was prepared by the following method. To an anhydrous methanol solution (5 ml) of ZnI2 (31.9 mg, 0.1 mmol) was added a methanol solution (10 ml) of the Schiff base compound (20.6 mg, 0.1 mmol) with stirring. The mixture was stirred for 30 min at room temperature and filtered. Upon keeping the filtrate in air for a few days, colorless block-shaped crystals were formed at the bottom of the vessel on slow evaporation of the solvent.

Refinement top

All H atoms were placed in geometrically idealized positions and constrained to ride on their parent atoms, with C–H distances in the range 0.93–0.97 Å, N–H distances of 0.91 Å, and with Uiso(H) = 1.2Ueq(C,N) and 1.5Ueq(methyl C).

Computing details top

Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT (Bruker, 2004); 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. The molecular structure of (I) with ellipsoids drawn at the 30% probability level.
[Figure 2] Fig. 2. The crystal packing of (I), viewed along the c axis.
{(E)-2-[3-(Dimethylammonio)propyliminomethyl]phenolato}diiodidozinc(II) top
Crystal data top
[ZnI2(C12H18N2O)]F(000) = 992
Mr = 525.45Dx = 2.048 Mg m3
Orthorhombic, Pna21Mo Kα radiation, λ = 0.71073 Å
Hall symbol: P 2c -2nCell parameters from 4125 reflections
a = 13.892 (3) Åθ = 2.4–25.0°
b = 16.640 (2) ŵ = 5.06 mm1
c = 7.372 (3) ÅT = 298 K
V = 1704.1 (8) Å3Block, colorless
Z = 40.20 × 0.20 × 0.18 mm
Data collection top
Bruker APEXII CCD area-detector
diffractometer
3669 independent reflections
Radiation source: fine-focus sealed tube3271 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.048
ω scansθmax = 27.0°, θmin = 1.9°
Absorption correction: multi-scan
(SADABS; Sheldrick, 2004)
h = 1717
Tmin = 0.431, Tmax = 0.463k = 2021
12154 measured reflectionsl = 99
Refinement top
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.043H-atom parameters constrained
wR(F2) = 0.100 w = 1/[σ2(Fo2) + (0.0426P)2 + 0.9395P]
where P = (Fo2 + 2Fc2)/3
S = 1.04(Δ/σ)max = 0.001
3669 reflectionsΔρmax = 1.82 e Å3
165 parametersΔρmin = 0.47 e Å3
1 restraintAbsolute structure: Flack (1983), 1660 Friedel pairs
Primary atom site location: structure-invariant direct methodsAbsolute structure parameter: 0.00 (4)
Crystal data top
[ZnI2(C12H18N2O)]V = 1704.1 (8) Å3
Mr = 525.45Z = 4
Orthorhombic, Pna21Mo Kα radiation
a = 13.892 (3) ŵ = 5.06 mm1
b = 16.640 (2) ÅT = 298 K
c = 7.372 (3) Å0.20 × 0.20 × 0.18 mm
Data collection top
Bruker APEXII CCD area-detector
diffractometer
3669 independent reflections
Absorption correction: multi-scan
(SADABS; Sheldrick, 2004)
3271 reflections with I > 2σ(I)
Tmin = 0.431, Tmax = 0.463Rint = 0.048
12154 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.043H-atom parameters constrained
wR(F2) = 0.100Δρmax = 1.82 e Å3
S = 1.04Δρmin = 0.47 e Å3
3669 reflectionsAbsolute structure: Flack (1983), 1660 Friedel pairs
165 parametersAbsolute structure parameter: 0.00 (4)
1 restraint
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
Zn10.75194 (6)0.90239 (4)0.72869 (14)0.03631 (19)
I10.58993 (3)0.92236 (3)0.88834 (9)0.04992 (15)
I20.89258 (4)0.98333 (3)0.85716 (9)0.05741 (18)
N10.7294 (4)0.9228 (3)0.4634 (8)0.0379 (13)
N20.8361 (5)1.1716 (3)0.3321 (11)0.0544 (19)
H2A0.78571.20520.31060.065*
O10.7847 (4)0.7893 (3)0.6946 (7)0.0429 (12)
C10.8309 (5)0.7664 (4)0.5451 (11)0.0385 (16)
C20.8869 (6)0.6960 (5)0.5496 (14)0.053 (2)
H20.89230.66720.65730.063*
C30.9338 (6)0.6691 (5)0.396 (2)0.070 (3)
H30.97220.62340.40300.084*
C40.9256 (7)0.7066 (5)0.2392 (16)0.063 (3)
H40.95750.68650.13800.075*
C50.8701 (7)0.7758 (5)0.2225 (15)0.063 (2)
H50.86530.80190.11130.075*
C60.8209 (5)0.8061 (4)0.3760 (13)0.0422 (15)
C70.7648 (5)0.8782 (4)0.3445 (10)0.0389 (16)
H70.75420.89260.22430.047*
C80.6691 (5)0.9919 (4)0.4056 (12)0.0456 (19)
H8A0.60740.98890.46670.055*
H8B0.65740.98800.27610.055*
C90.7143 (6)1.0712 (4)0.4458 (11)0.0459 (19)
H9A0.73581.07210.57100.055*
H9B0.66681.11340.43050.055*
C100.7992 (6)1.0871 (4)0.3217 (13)0.049 (2)
H10A0.85101.05050.35310.059*
H10B0.78021.07580.19770.059*
C110.8730 (10)1.1894 (6)0.5117 (19)0.100 (5)
H11A0.91641.14760.54880.150*
H11B0.82051.19260.59600.150*
H11C0.90661.23980.50920.150*
C120.9089 (8)1.1848 (6)0.186 (2)0.101 (5)
H12A0.92691.24050.18340.151*
H12B0.88191.16990.07110.151*
H12C0.96481.15250.20990.151*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Zn10.0426 (5)0.0328 (3)0.0335 (4)0.0041 (3)0.0026 (4)0.0028 (3)
I10.0415 (3)0.0491 (2)0.0591 (3)0.00396 (18)0.0126 (3)0.0002 (3)
I20.0486 (3)0.0603 (3)0.0633 (4)0.0039 (2)0.0084 (3)0.0062 (3)
N10.037 (3)0.042 (3)0.035 (3)0.012 (2)0.001 (3)0.004 (3)
N20.048 (4)0.029 (3)0.086 (6)0.005 (3)0.002 (4)0.007 (3)
O10.052 (3)0.032 (2)0.045 (3)0.008 (2)0.007 (3)0.006 (2)
C10.034 (4)0.033 (3)0.048 (5)0.008 (3)0.005 (3)0.002 (3)
C20.055 (5)0.040 (4)0.063 (6)0.008 (4)0.016 (4)0.005 (4)
C30.059 (5)0.040 (4)0.111 (9)0.008 (4)0.019 (7)0.003 (6)
C40.063 (6)0.052 (5)0.073 (7)0.010 (4)0.028 (5)0.016 (5)
C50.070 (6)0.063 (5)0.055 (6)0.001 (4)0.014 (5)0.012 (5)
C60.040 (4)0.040 (3)0.046 (4)0.003 (3)0.008 (4)0.004 (4)
C70.049 (4)0.044 (3)0.024 (4)0.001 (3)0.003 (3)0.001 (3)
C80.041 (4)0.045 (3)0.051 (5)0.001 (3)0.004 (4)0.017 (4)
C90.051 (5)0.039 (4)0.047 (5)0.016 (3)0.006 (4)0.005 (3)
C100.051 (5)0.027 (3)0.070 (6)0.005 (3)0.005 (4)0.006 (3)
C110.111 (10)0.054 (6)0.135 (11)0.023 (6)0.078 (9)0.026 (6)
C120.074 (7)0.052 (5)0.177 (15)0.007 (5)0.051 (8)0.028 (8)
Geometric parameters (Å, º) top
Zn1—O11.952 (4)C5—C61.415 (12)
Zn1—N12.010 (6)C5—H50.9300
Zn1—I22.5550 (11)C6—C71.449 (9)
Zn1—I12.5615 (11)C7—H70.9300
N1—C71.250 (9)C8—C91.491 (10)
N1—C81.485 (9)C8—H8A0.9700
N2—C111.451 (14)C8—H8B0.9700
N2—C121.493 (15)C9—C101.516 (12)
N2—C101.498 (8)C9—H9A0.9700
N2—H2A0.9100C9—H9B0.9700
O1—C11.331 (9)C10—H10A0.9700
C1—C21.406 (10)C10—H10B0.9700
C1—C61.417 (12)C11—H11A0.9600
C2—C31.384 (15)C11—H11B0.9600
C2—H20.9300C11—H11C0.9600
C3—C41.317 (17)C12—H12A0.9600
C3—H30.9300C12—H12B0.9600
C4—C51.392 (12)C12—H12C0.9600
C4—H40.9300
O1—Zn1—N194.3 (2)N1—C7—C6126.2 (7)
O1—Zn1—I2112.17 (16)N1—C7—H7116.9
N1—Zn1—I2113.02 (16)C6—C7—H7116.9
O1—Zn1—I1112.90 (16)N1—C8—C9113.0 (6)
N1—Zn1—I1106.74 (18)N1—C8—H8A109.0
I2—Zn1—I1115.67 (4)C9—C8—H8A109.0
C7—N1—C8118.8 (7)N1—C8—H8B109.0
C7—N1—Zn1121.4 (5)C9—C8—H8B109.0
C8—N1—Zn1119.9 (5)H8A—C8—H8B107.8
C11—N2—C12112.8 (9)C8—C9—C10111.2 (6)
C11—N2—C10111.1 (7)C8—C9—H9A109.4
C12—N2—C10109.5 (8)C10—C9—H9A109.4
C11—N2—H2A107.8C8—C9—H9B109.4
C12—N2—H2A107.8C10—C9—H9B109.4
C10—N2—H2A107.8H9A—C9—H9B108.0
C1—O1—Zn1119.6 (4)N2—C10—C9113.5 (6)
O1—C1—C2119.0 (7)N2—C10—H10A108.9
O1—C1—C6123.2 (6)C9—C10—H10A108.9
C2—C1—C6117.6 (7)N2—C10—H10B108.9
C3—C2—C1120.7 (9)C9—C10—H10B108.9
C3—C2—H2119.6H10A—C10—H10B107.7
C1—C2—H2119.6N2—C11—H11A109.5
C4—C3—C2121.6 (8)N2—C11—H11B109.5
C4—C3—H3119.2H11A—C11—H11B109.5
C2—C3—H3119.2N2—C11—H11C109.5
C3—C4—C5121.2 (9)H11A—C11—H11C109.5
C3—C4—H4119.4H11B—C11—H11C109.5
C5—C4—H4119.4N2—C12—H12A109.5
C4—C5—C6119.5 (10)N2—C12—H12B109.5
C4—C5—H5120.3H12A—C12—H12B109.5
C6—C5—H5120.3N2—C12—H12C109.5
C5—C6—C1119.3 (7)H12A—C12—H12C109.5
C5—C6—C7115.2 (8)H12B—C12—H12C109.5
C1—C6—C7125.4 (7)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N2—H2A···O1i0.911.912.772 (8)157
Symmetry code: (i) x+3/2, y+1/2, z1/2.

Experimental details

Crystal data
Chemical formula[ZnI2(C12H18N2O)]
Mr525.45
Crystal system, space groupOrthorhombic, Pna21
Temperature (K)298
a, b, c (Å)13.892 (3), 16.640 (2), 7.372 (3)
V3)1704.1 (8)
Z4
Radiation typeMo Kα
µ (mm1)5.06
Crystal size (mm)0.20 × 0.20 × 0.18
Data collection
DiffractometerBruker APEXII CCD area-detector
diffractometer
Absorption correctionMulti-scan
(SADABS; Sheldrick, 2004)
Tmin, Tmax0.431, 0.463
No. of measured, independent and
observed [I > 2σ(I)] reflections
12154, 3669, 3271
Rint0.048
(sin θ/λ)max1)0.639
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.043, 0.100, 1.04
No. of reflections3669
No. of parameters165
No. of restraints1
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å3)1.82, 0.47
Absolute structureFlack (1983), 1660 Friedel pairs
Absolute structure parameter0.00 (4)

Computer programs: APEX2 (Bruker, 2004), SAINT (Bruker, 2004), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Selected geometric parameters (Å, º) top
Zn1—O11.952 (4)Zn1—I22.5550 (11)
Zn1—N12.010 (6)Zn1—I12.5615 (11)
O1—Zn1—N194.3 (2)O1—Zn1—I1112.90 (16)
O1—Zn1—I2112.17 (16)N1—Zn1—I1106.74 (18)
N1—Zn1—I2113.02 (16)I2—Zn1—I1115.67 (4)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N2—H2A···O1i0.911.912.772 (8)157
Symmetry code: (i) x+3/2, y+1/2, z1/2.
 

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