Diaqua­{2,6-bis­[N-(2-pyridinylmeth­yl)­carbamo­yl]­phenolato-κ2O1,O2}zinc(II)

Suksai, C.; Watchasit, S.; Tuntulani, T.; Pakawatchai, C.

doi:10.1107/S1600536808016693

metal-organic compounds

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ISSN: 2056-9890

Volume 64| Part 7| July 2008| Pages m884-m885

doi:10.1107/S1600536808016693

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ADDENDA AND ERRATA

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Diaqua{2,6-bis[N-(2-pyridinylmethyl)carbamoyl]phenolato-κ²O¹,O²}zinc(II)

Chomchai Suksai,^a ^* Sarayut Watchasit,^a Thawatchai Tuntulani ^b and Chaveng Pakawatchai ^c

^aDepartment of Chemistry, Faculty of Science, Burapha University, Chonburi 20131, Thailand, ^bDepartment of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand, and ^cDepartment of Chemistry, Faculty of Science, Prince of Songkla University, Songkhla 90112, Thailand
^*Correspondence e-mail: jomjai@buu.ac.th, tthawatc@chula.ac.th

(Received 14 May 2008; accepted 1 June 2008; online 7 June 2008)

In the title compound, [Zn(C₂₀H₁₇N₄O₃)₂(H₂O)₂], the Zn^II atom, lying on a twofold rotation axis, is six-coordinated in a distorted octahedral geometry by two phenolate O atoms and two carbonyl O atoms from two 2,6-bis[(pyridin-2-ylmethyl)carbamoyl]phenolate ligands and by two water molecules. A three-dimensional network is built up from an extensive array of hydrogen bonds and π–π interactions between the pyridyl rings, with a centroid–centroid distance of 3.666 (3) Å.

Related literature

For related literature, see: Chaudhuri et al. (2007 ); Goldsmith et al. (2002 ); Gumbley & Stewart (1984 ); Ingle et al. (2007 ); Kimura (1994 ); Lipscomb & Sträter (1996 ); Szajna-Fuller et al. (2007 ).

Experimental

Crystal data

[Zn(C₂₀H₁₇N₄O₃)₂(H₂O)₂]
M_r = 824.18
Monoclinic, C 2/c
a = 16.357 (4) Å
b = 14.723 (4) Å
c = 15.135 (4) Å
β = 91.938 (7)°
V = 3642.9 (16) Å³
Z = 4
Mo Kα radiation
μ = 0.74 mm⁻¹
T = 293 (2) K
0.35 × 0.3 × 0.2 mm

Data collection

Bruker SMART APEX CCD area-detector diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ) T_min = 0.757, T_max = 0.854
21455 measured reflections
4398 independent reflections
3575 reflections with I > 2σ(I)
R_int = 0.061

Refinement

R[F² > 2σ(F²)] = 0.060
wR(F²) = 0.130
S = 1.11
4398 reflections
260 parameters
H-atom parameters constrained
Δρ_max = 0.52 e Å⁻³
Δρ_min = −0.42 e Å⁻³

Table 1
Selected geometric parameters (Å, °)

O1—Zn1	1.9772 (18)
O2—Zn1	2.1572 (19)
O4—Zn1	2.149 (2)

O1—Zn1—O1ⁱ	175.44 (11)
O1—Zn1—O4ⁱ	85.97 (8)
O1—Zn1—O4	97.42 (8)
O4ⁱ—Zn1—O4	84.55 (12)
O1—Zn1—O2	84.29 (7)
O4—Zn1—O2	91.26 (8)
O1—Zn1—O2ⁱ	92.61 (8)
O4—Zn1—O2ⁱ	168.82 (8)
O2—Zn1—O2ⁱ	94.67 (12)
Symmetry code: (i) $[-x, y, -z+{\script{1\over 2}}]$ .

Table 2
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N3—H3A⋯O1	0.86	1.93	2.623 (3)	136
N1—H1⋯N4ⁱⁱ	0.86	2.20	3.007 (4)	155
O4—H24⋯O3ⁱⁱⁱ	0.85	1.87	2.712 (3)	174
O4—H23⋯N2^iv	0.87	2.03	2.879 (3)	163
Symmetry codes: (ii) $[x+{\script{1\over 2}}, y+{\script{1\over 2}}, z]$ ; (iii) -x, -y, -z; (iv) $[-x+{\script{1\over 2}}, y-{\script{1\over 2}}, -z+{\script{1\over 2}}]$ .

Data collection: SMART (Bruker, 2007 ); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997 ) and Mercury (Macrae et al., 2006 ); software used to prepare material for publication: SHELXL97.

Supporting information

Crystal structure: contains datablocks global, I. DOI: 10.1107/S1600536808016693/hy2136sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536808016693/hy2136Isup2.hkl

checkCIF report

Comment top

Zinc complexes of common amide-containing ligands have been widely explored and have received much attention in biomimetic research (Ingle et al., 2007). For example, the zinc complex with 6-(pivaloylamido-2-pyridylmethyl)amine ligand has been synthesized to serve as models for amide hydrolysis activity (Szajna-Fuller et al., 2007). Recently, zinc and copper complexes with a family of pyridylmethylamide ligands have been synthesized and showed that these ligands coordinate to metal ions with different coordination modes (Chaudhuri et al., 2007). It should be mentioned that zinc complexes containing aqua ligands have been used as model studies for zinc-hydrolase enzyme because of the functional unit at the active site of zinc-hydrolase enzyme is a zinc-bound water molecule, which is deprotonated at near neutral pH to generate a strongly nucleophilic Zn—OH group (Lipscomb & Sträter, 1996). Moreover, the aqua ligand bound to zinc ion is further stabilized via the formation of a hydrogen bond with a carboxylate or phenolic group from amino acid residues (Kimura, 1994). This hydrogen bond has been postulated to play a role in the activation of the coordinated aqua ligand in the catalytic pathway.

In an ongoing effort to study the interaction of zinc ion with aqua ligand, we report here the synthesis and characterization of the title compound, a new zinc complex with 2,6-bis[(pyridin-2-ylmethyl)carbamoyl]phenolate and aqua ligands. The electrospray mass spectrometry (ESI-MS) of the title compound confirmed the presence of the molecular species in solution. The compound has fragmentation patterns with peaks at m/z = 823.17 and 787.19; the former corresponds to the [M+2H₂O+H⁺] ion and the latter is consistent with the loss of two coordinated water molecules [M–2H₂O+H⁺]. The evidence for the presence of water in the complex is also given by IR absorption at 3568 cm^-1. The elemental analysis agrees well with the proposed structure.

In the title compound, the Zn^II atom is situated on a twofold rotation axis in a distorted octahedral coordination geometry, which is defined by two phenolate O atoms, two carbonyl O atoms and two cis water molecules (Fig. 1). The O1—Zn1—O1ⁱ and O4—Zn1—O2ⁱ [symmetry code: (i) -x, y, 1/2 - z] angles deviate from linearity (Table 1). These results are in accordance with the distorted octahedral geometry. It is noteworthy that each ligand behaves in a bidentate coordination fashion involving one phenolate O atom and one carbonyl O atom, while the two amide N atoms and pyridyl N atoms are free of coordination with the Zn atom. The two phenyl rings of coordinated molecules are tilted to one another with a dihedral angle of 72.3 (3)°. Remarkably, the intramolecular N3—H3A···O1 hydrogen bond forms a pseudo-six-membered ring (Fig. 1).

The water molecule is involved in an extensive intermolecular hydrogen-bonding network, as shown in Fig. 2. Atom O4 of aqua ligand acts as a hydrogen-bond donor to the uncoordinated carbonyl O3 atom and uncoordinated pyridyl N2 atom of adjacent complex molecules, respectively (Table 2). Additionally, the molecules are held together by intermolecular hydrogen bond between the uncoordinated amide N1 atom and uncoordinated pyridyl N4 atom. Not only the intermolecular hydrogen bonds, but also there are intermolecular π–π interactions in the crystal structure, which occur between the pyridyl rings containing atoms N2 and N4 of adjacent molecules, with a centroid–centroid distance of 3.666 (3) Å.

Related literature top

For related literature, see: Chaudhuri et al. (2007); Goldsmith et al. (2002); Gumbley & Stewart (1984); Ingle et al. (2007); Kimura (1994); Lipscomb & Sträter (1996); Szajna-Fuller et al. (2007).

Experimental top

Intermediate products (I), (II) (Gumbley & Stewart, 1984) and (III) (Goldsmith et al., 2002) have been synthesized in accordance with the published procedures. The methods to synthesize compounds (IV) and (V) are shown in Fig. 3.

A methanol solution (5 ml) of Zn(ClO₄)₂.6H₂O (2.22 g, 5.96 mmol) was added dropwise to a stirred solution of compound (V) (1.00 g, 2.98 mmol) in methanol (10 ml) at room temperature and the solution was stirred for 3 h. Water (10 ml) was added to the solution to precipitate a white solid. The precipitate was filtered off and washed with water to obtain the white powder of the title compound (yield 28%, 0.66 g). m.p. 170–173 °C. Recrystallization of this powder in methanol yielded colourless block crystals of the title compound, suitable for X-ray diffraction study. Analysis, calculated for C₄₀H₃₈N₈O₈Zn: C 58.29, H 4.65, N 13.60%; found: C 58.20, H 4.67, N 13.61%. ¹H-NMR (400 MHz, DMSO-d₆): δ 10.95 (bs, 2H, –NH), 8.50 (d, J = 4.0 Hz, 2H, ArH), 7.95 (s, 2H, ArH), 7.74 (t, J = 7.6 Hz, 2H, ArH), 7.33 (t, J = 8.0 Hz, 2H, ArH), 7.26 (t, J = 5.6 Hz, 2H, ArH), 6.60 (bs,1H, ArH), 4.60 (s, 2H, –CH₂–), 4.59 (s, 2H,–CH₂–). ¹³C-NMR (100 MHz, DMSO-d₆): δ 168.97, 159.20, 149.25, 137.39, 133.99, 122.61, 121.66, 111.55, 44.73. ESI-MS: m/z 787.19 [M–2H₂O+H⁺], 823.17 [M+2H₂O+H⁺].

Computing details top

Data collection: SMART (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top

	Fig. 1. The molecular structure of the title compound. Displacement ellipsoids are drawn at the 50% probability level. H atoms have been omitted except those involved in hydrogen bonds. Hydrogen bonds are shown as dashed lines. [Symmetry code: (i) -x, y, 0.5 - z.]
	Fig. 2. The three-dimensional hydrogen bonding network in the title compound. H atoms have been omitted for clarity. Hydrogen bonds are shown as dashed lines.
	Fig. 3. The synthesis of compounds (IV) and (V).

Diaqua{2,6-bis[N-(2-pyridylmethyl)carbamoyl]phenolato- κ²O¹,O²}zinc(II) top

Crystal data top

[Zn(C₂₀H₁₇N₄O₃)₂(H₂O)₂]	F(000) = 1712
M_r = 824.18	D_x = 1.503 Mg m⁻³
Monoclinic, C2/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -C 2yc	Cell parameters from 4398 reflections
a = 16.357 (4) Å	θ = 1.9–28.0°
b = 14.723 (4) Å	µ = 0.74 mm⁻¹
c = 15.135 (4) Å	T = 293 K
β = 91.938 (7)°	Prism, colourless
V = 3642.9 (16) Å³	0.35 × 0.3 × 0.2 mm
Z = 4

Data collection top

Bruker SMART APEX CCD area-detector diffractometer	3575 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.061
ϕ and ω scans	θ_max = 28.0°, θ_min = 1.9°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −21→21
T_min = 0.757, T_max = 0.854	k = −19→19
21455 measured reflections	l = −19→19
4398 independent reflections

Refinement top

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)] = 0.060	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.130	H-atom parameters constrained
S = 1.11	w = 1/[σ²(F_o²) + (0.0553P)² + 3.7977P] where P = (F_o² + 2F_c²)/3
4398 reflections	(Δ/σ)_max < 0.001
260 parameters	Δρ_max = 0.52 e Å⁻³
0 restraints	Δρ_min = −0.42 e Å⁻³

Crystal data top

[Zn(C₂₀H₁₇N₄O₃)₂(H₂O)₂]	V = 3642.9 (16) Å³
M_r = 824.18	Z = 4
Monoclinic, C2/c	Mo Kα radiation
a = 16.357 (4) Å	µ = 0.74 mm⁻¹
b = 14.723 (4) Å	T = 293 K
c = 15.135 (4) Å	0.35 × 0.3 × 0.2 mm
β = 91.938 (7)°

Data collection top

Bruker SMART APEX CCD area-detector diffractometer	4398 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	3575 reflections with I > 2σ(I)
T_min = 0.757, T_max = 0.854	R_int = 0.061
21455 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.060	0 restraints
wR(F²) = 0.130	H-atom parameters constrained
S = 1.11	Δρ_max = 0.52 e Å⁻³
4398 reflections	Δρ_min = −0.42 e Å⁻³
260 parameters

Special details top

Experimental. Compound (IV): To a solution of (III) (2.38 g, 10.2 mmol) in dry CH₂Cl₂ (5 ml) was added to a well stirred mixture of 2-(aminomethyl)-pyridine (2.60 ml, 25.5 mmol) and NEt₃ (5.33 ml, 38.3 mmol) in dried CH₂Cl₂ (5 ml) under nitrogen atmosphere and the reaction was then left stirring overnight. Next, the solvent was removed under vacuum and the residue was purified by column chromatography on Al₂O₃ with 50% EtOAc:CH₂Cl₂ as eluent. The resulting pale yellow solid was recrystallized in diethyl ether to give a pure white solid (IV) (yield 68%, 2.68 g). m.p. 120–125 °C. ¹H-NMR (400 MHz, CDCl₃): δ 8.70 (s, 2H, –NH), 8.61 (d, J = 4.4 Hz, 2H, ArH), 8.20 (d, J = 8.0 Hz, 2H, ArH), 7.71 (m, 2H, PyH), 7.38 (m, 3H, ArH), 7.25 (m, 2H, ArH), 4.85 (s, 2H, –CH₂–), 4.83 (s, 2H, –CH₂–), 3.88 (s, 3H, –CH₃). ¹³C-NMR (100 MHz, DMSO-d₆): δ 164.90, 156.69, 156.53, 149.18, 136.81, 134.82, 127.60, 125.11, 122.45, 122.24, 63.83, 45.16.

Compound (V): Anhydrous LiI (3.89 g, 28.9 mmol) was added to a well stirred solution of (IV) (0.78 g, 2.89 mmol) in anhydrous pyridine (20 ml) at room temperature. The reaction was allowed to proceed for 7 d with constant stirring. Then pyridine was removed in vacuum and the residue was dissloved in 1 M HCl (20 ml) and extracted with ethyl acetate (3 x 20 ml). The combined organic phase was dried over anhydrous Na₂SO₄, filtered and brought to dryness by rotary evaporation. The crude product was recrystallized in a solution of methanol and diethyl ether, giving (V) as a white solid (yield 92% ,0.95 g). m.p 100–103 °C. Analysis, calculated for C₂₀H₁₈N₄O₃: C 66.29, H 5.01, N 15.46%; found: C 66.31, H 4.99, N 15.45%. ¹H-NMR (400 MHz, CDCl₃): δ 8.77(s, 2H, –NH), 8.61 (d, J = 4.8 Hz, 2H, ArH), 8.11 (d, J = 7.6 Hz, 2H, ArH), 7.71 (m, 2H, ArH), 7.39 (d, J = 7.6 Hz, 2H, ArH), 7.26 (m, 2H, ArH), 7.03 (t, J = 8.0 Hz, 1H, ArH), 4.82 (s, 2H, –CH₂–), 4.81 (s, 2H, –CH₂–). ¹³C-NMR (100 MHz, CDCl₃): δ 167.66, 160.59, 156.26, 149.06, 137.01, 133.28, 122.52, 122.08, 118.61, 117.94, 44.73. ESI: m/z 348.1458 [M+H⁺].

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
C1	0.02286 (15)	0.19100 (17)	0.05522 (17)	0.0236 (5)
C2	0.09384 (16)	0.24793 (18)	0.06360 (17)	0.0269 (6)
C3	0.14191 (17)	0.26133 (19)	−0.0097 (2)	0.0343 (6)
H3	0.1885	0.2972	−0.0036	0.041*
C4	0.12260 (19)	0.2232 (2)	−0.0905 (2)	0.0403 (7)
H4	0.156	0.2329	−0.1382	0.048*
C5	0.05325 (18)	0.1705 (2)	−0.10030 (19)	0.0368 (7)
H5	0.0395	0.1457	−0.1553	0.044*
C6	0.00339 (16)	0.15366 (17)	−0.02945 (17)	0.0264 (6)
C7	−0.06868 (17)	0.09354 (18)	−0.04851 (19)	0.0312 (6)
C8	−0.17697 (17)	0.0002 (2)	0.0089 (2)	0.0389 (7)
H8A	−0.183	−0.0314	0.0645	0.047*
H8B	−0.1619	−0.0445	−0.0347	0.047*
C9	−0.25903 (17)	0.04027 (19)	−0.01925 (18)	0.0299 (6)
C10	−0.27189 (18)	0.1306 (2)	−0.0387 (2)	0.0377 (7)
H10	−0.2288	0.1718	−0.0348	0.045*
C11	−0.3496 (2)	0.1594 (2)	−0.0642 (2)	0.0461 (8)
H11	−0.3598	0.2203	−0.0764	0.055*
C12	−0.4113 (2)	0.0968 (3)	−0.0711 (2)	0.0539 (9)
H12	−0.4638	0.1139	−0.0897	0.065*
C13	−0.3936 (2)	0.0081 (3)	−0.0498 (3)	0.0578 (10)
H13	−0.4358	−0.0343	−0.0539	0.069*
C14	0.11584 (15)	0.29456 (18)	0.14819 (19)	0.0291 (6)
C15	0.1960 (2)	0.4212 (2)	0.2162 (2)	0.0428 (8)
H15A	0.2548	0.4131	0.2219	0.051*
H15B	0.1723	0.3991	0.2701	0.051*
C16	0.17668 (18)	0.5211 (2)	0.20506 (19)	0.0352 (6)
N2	0.23880 (15)	0.57968 (17)	0.21397 (17)	0.0372 (6)
C20	0.2219 (2)	0.6684 (2)	0.2034 (2)	0.0478 (8)
H20	0.2647	0.7097	0.2104	0.057*
C19	0.1456 (3)	0.7013 (3)	0.1829 (2)	0.0544 (9)
H19	0.137	0.7633	0.1753	0.065*
C18	0.0825 (2)	0.6416 (3)	0.1738 (3)	0.0615 (10)
H18	0.0298	0.6619	0.1599	0.074*
N1	0.16417 (16)	0.36823 (17)	0.14154 (17)	0.0383 (6)
H1	0.1771	0.3851	0.0894	0.046*
C17	0.0979 (2)	0.5508 (3)	0.1857 (3)	0.0553 (9)
H17	0.0553	0.5091	0.1806	0.066*
N3	−0.11105 (14)	0.06472 (16)	0.01965 (16)	0.0339 (5)
H3A	−0.0987	0.0852	0.0716	0.041*
N4	−0.31909 (16)	−0.02078 (19)	−0.02365 (19)	0.0458 (7)
O1	−0.02465 (11)	0.17550 (13)	0.12131 (12)	0.0297 (4)
O2	0.09257 (12)	0.26946 (14)	0.22198 (13)	0.0363 (5)
O3	−0.08908 (14)	0.07239 (16)	−0.12543 (15)	0.0473 (6)
O4	0.08829 (13)	0.06216 (15)	0.24782 (15)	0.0431 (5)
Zn1	0	0.17016 (3)	0.25	0.02664 (14)
H24	0.0847	0.0211	0.2086	0.052 (11)*
H23	0.1415	0.067	0.2476	0.078 (14)*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.0218 (12)	0.0203 (12)	0.0284 (13)	0.0028 (10)	−0.0027 (10)	0.0033 (10)
C2	0.0270 (13)	0.0237 (13)	0.0299 (14)	0.0008 (11)	0.0002 (11)	0.0035 (11)
C3	0.0272 (14)	0.0312 (15)	0.0447 (17)	−0.0039 (12)	0.0047 (12)	0.0051 (13)
C4	0.0400 (17)	0.0441 (18)	0.0376 (17)	0.0014 (14)	0.0120 (13)	0.0059 (14)
C5	0.0395 (16)	0.0410 (17)	0.0299 (15)	0.0054 (14)	0.0015 (12)	−0.0021 (13)
C6	0.0261 (13)	0.0243 (14)	0.0286 (13)	0.0041 (10)	−0.0012 (10)	0.0015 (10)
C7	0.0315 (14)	0.0255 (14)	0.0362 (16)	0.0068 (11)	−0.0054 (12)	−0.0068 (12)
C8	0.0300 (15)	0.0307 (16)	0.055 (2)	−0.0043 (12)	−0.0110 (13)	0.0031 (14)
C9	0.0305 (14)	0.0292 (14)	0.0296 (14)	−0.0046 (11)	−0.0042 (11)	0.0031 (11)
C10	0.0344 (16)	0.0315 (15)	0.0472 (18)	−0.0007 (13)	−0.0008 (13)	0.0027 (13)
C11	0.0454 (19)	0.0428 (19)	0.050 (2)	0.0122 (15)	−0.0002 (15)	0.0050 (15)
C12	0.0333 (17)	0.068 (2)	0.060 (2)	0.0082 (17)	−0.0099 (15)	0.0120 (19)
C13	0.0321 (17)	0.062 (2)	0.078 (3)	−0.0144 (17)	−0.0142 (17)	0.019 (2)
C14	0.0208 (13)	0.0247 (13)	0.0412 (16)	0.0002 (10)	−0.0071 (11)	0.0041 (12)
C15	0.0442 (18)	0.0369 (17)	0.0462 (19)	−0.0125 (14)	−0.0135 (14)	0.0017 (14)
C16	0.0353 (16)	0.0353 (16)	0.0346 (16)	−0.0068 (13)	−0.0049 (12)	0.0002 (12)
N2	0.0360 (13)	0.0322 (13)	0.0427 (14)	−0.0078 (11)	−0.0071 (11)	−0.0002 (11)
C20	0.059 (2)	0.0314 (16)	0.052 (2)	−0.0095 (16)	−0.0073 (16)	−0.0007 (15)
C19	0.078 (3)	0.0413 (19)	0.043 (2)	0.0131 (19)	−0.0050 (18)	−0.0011 (15)
C18	0.046 (2)	0.067 (3)	0.071 (3)	0.0168 (19)	−0.0048 (18)	−0.002 (2)
N1	0.0448 (15)	0.0336 (13)	0.0361 (14)	−0.0177 (11)	−0.0047 (11)	0.0052 (11)
C17	0.0342 (18)	0.060 (2)	0.071 (3)	−0.0095 (16)	−0.0053 (17)	−0.0001 (19)
N3	0.0292 (12)	0.0327 (13)	0.0393 (14)	−0.0066 (10)	−0.0069 (10)	−0.0016 (10)
N4	0.0349 (14)	0.0403 (15)	0.0615 (18)	−0.0121 (12)	−0.0109 (12)	0.0156 (13)
O1	0.0258 (9)	0.0377 (11)	0.0256 (9)	−0.0075 (8)	0.0001 (7)	0.0014 (8)
O2	0.0420 (12)	0.0356 (11)	0.0309 (11)	−0.0135 (9)	−0.0033 (9)	0.0007 (9)
O3	0.0514 (13)	0.0489 (14)	0.0410 (13)	−0.0034 (11)	−0.0087 (10)	−0.0180 (11)
O4	0.0323 (12)	0.0397 (12)	0.0567 (14)	0.0075 (9)	−0.0049 (10)	−0.0215 (11)
Zn1	0.0272 (2)	0.0271 (2)	0.0254 (2)	0	−0.00199 (16)	0

Geometric parameters (Å, º) top

C1—O1	1.307 (3)	C13—H13	0.93
C1—C6	1.421 (4)	C14—O2	1.248 (3)
C1—C2	1.434 (4)	C14—N1	1.348 (3)
C2—C3	1.395 (4)	C15—N1	1.455 (4)
C2—C14	1.486 (4)	C15—C16	1.514 (4)
C3—C4	1.373 (4)	C15—H15A	0.97
C3—H3	0.93	C15—H15B	0.97
C4—C5	1.378 (4)	C16—N2	1.336 (4)
C4—H4	0.93	C16—C17	1.383 (4)
C5—C6	1.391 (4)	N2—C20	1.344 (4)
C5—H5	0.93	C20—C19	1.365 (5)
C6—C7	1.495 (4)	C20—H20	0.93
C7—O3	1.240 (3)	C19—C18	1.361 (6)
C7—N3	1.332 (4)	C19—H19	0.93
C8—N3	1.442 (4)	C18—C17	1.371 (5)
C8—C9	1.514 (4)	C18—H18	0.93
C8—H8A	0.97	N1—H1	0.86
C8—H8B	0.97	C17—H17	0.93
C9—N4	1.332 (4)	N3—H3A	0.86
C9—C10	1.377 (4)	O1—Zn1	1.9772 (18)
C10—C11	1.382 (4)	O2—Zn1	2.1572 (19)
C10—H10	0.93	O4—Zn1	2.149 (2)
C11—C12	1.368 (5)	O4—H24	0.85
C11—H11	0.93	O4—H23	0.87
C12—C13	1.374 (5)	Zn1—O1ⁱ	1.9772 (18)
C12—H12	0.93	Zn1—O4ⁱ	2.149 (2)
C13—N4	1.338 (4)	Zn1—O2ⁱ	2.1572 (19)

O1—C1—C6	120.1 (2)	C16—C15—H15A	109.3
O1—C1—C2	122.3 (2)	N1—C15—H15B	109.3
C6—C1—C2	117.5 (2)	C16—C15—H15B	109.3
C3—C2—C1	119.3 (2)	H15A—C15—H15B	108
C3—C2—C14	119.5 (2)	N2—C16—C17	121.2 (3)
C1—C2—C14	121.2 (2)	N2—C16—C15	117.5 (3)
C4—C3—C2	122.1 (3)	C17—C16—C15	121.3 (3)
C4—C3—H3	118.9	C16—N2—C20	117.6 (3)
C2—C3—H3	118.9	N2—C20—C19	123.7 (3)
C3—C4—C5	119.3 (3)	N2—C20—H20	118.2
C3—C4—H4	120.4	C19—C20—H20	118.2
C5—C4—H4	120.4	C18—C19—C20	118.6 (3)
C4—C5—C6	121.3 (3)	C18—C19—H19	120.7
C4—C5—H5	119.3	C20—C19—H19	120.7
C6—C5—H5	119.3	C19—C18—C17	118.8 (4)
C5—C6—C1	120.4 (2)	C19—C18—H18	120.6
C5—C6—C7	115.9 (2)	C17—C18—H18	120.6
C1—C6—C7	123.7 (2)	C14—N1—C15	124.6 (3)
O3—C7—N3	121.1 (3)	C14—N1—H1	117.7
O3—C7—C6	121.0 (3)	C15—N1—H1	117.7
N3—C7—C6	117.8 (2)	C18—C17—C16	120.1 (3)
N3—C8—C9	115.3 (2)	C18—C17—H17	119.9
N3—C8—H8A	108.4	C16—C17—H17	119.9
C9—C8—H8A	108.4	C7—N3—C8	122.0 (3)
N3—C8—H8B	108.4	C7—N3—H3A	119
C9—C8—H8B	108.4	C8—N3—H3A	119
H8A—C8—H8B	107.5	C9—N4—C13	117.6 (3)
N4—C9—C10	122.3 (3)	C1—O1—Zn1	130.85 (16)
N4—C9—C8	113.4 (2)	C14—O2—Zn1	127.87 (18)
C10—C9—C8	124.3 (3)	Zn1—O4—H24	121
C9—C10—C11	119.2 (3)	Zn1—O4—H23	128
C9—C10—H10	120.4	H24—O4—H23	96
C11—C10—H10	120.4	O1—Zn1—O1ⁱ	175.44 (11)
C12—C11—C10	118.9 (3)	O1—Zn1—O4ⁱ	85.97 (8)
C12—C11—H11	120.5	O1ⁱ—Zn1—O4ⁱ	97.42 (8)
C10—C11—H11	120.5	O1—Zn1—O4	97.42 (8)
C11—C12—C13	118.3 (3)	O1ⁱ—Zn1—O4	85.97 (8)
C11—C12—H12	120.8	O4ⁱ—Zn1—O4	84.55 (12)
C13—C12—H12	120.8	O1—Zn1—O2	84.29 (7)
N4—C13—C12	123.6 (3)	O1ⁱ—Zn1—O2	92.61 (8)
N4—C13—H13	118.2	O4ⁱ—Zn1—O2	168.82 (8)
C12—C13—H13	118.2	O4—Zn1—O2	91.26 (8)
O2—C14—N1	120.2 (3)	O1—Zn1—O2ⁱ	92.61 (8)
O2—C14—C2	124.2 (2)	O1ⁱ—Zn1—O2ⁱ	84.29 (7)
N1—C14—C2	115.7 (2)	O4ⁱ—Zn1—O2ⁱ	91.26 (8)
N1—C15—C16	111.5 (3)	O4—Zn1—O2ⁱ	168.82 (8)
N1—C15—H15A	109.3	O2—Zn1—O2ⁱ	94.67 (12)

O1—C1—C2—C3	179.9 (2)	C17—C16—N2—C20	0.0 (5)
C6—C1—C2—C3	−2.4 (4)	C15—C16—N2—C20	179.5 (3)
O1—C1—C2—C14	−1.7 (4)	C16—N2—C20—C19	−1.0 (5)
C6—C1—C2—C14	176.1 (2)	N2—C20—C19—C18	1.0 (6)
C1—C2—C3—C4	1.4 (4)	C20—C19—C18—C17	0.0 (6)
C14—C2—C3—C4	−177.1 (3)	O2—C14—N1—C15	2.9 (4)
C2—C3—C4—C5	0.5 (5)	C2—C14—N1—C15	−177.0 (3)
C3—C4—C5—C6	−1.3 (5)	C16—C15—N1—C14	−127.1 (3)
C4—C5—C6—C1	0.2 (4)	C19—C18—C17—C16	−1.0 (6)
C4—C5—C6—C7	−178.5 (3)	N2—C16—C17—C18	1.0 (5)
O1—C1—C6—C5	179.4 (2)	C15—C16—C17—C18	−178.5 (3)
C2—C1—C6—C5	1.6 (4)	O3—C7—N3—C8	6.7 (4)
O1—C1—C6—C7	−1.9 (4)	C6—C7—N3—C8	−174.4 (2)
C2—C1—C6—C7	−179.8 (2)	C9—C8—N3—C7	−83.3 (4)
C5—C6—C7—O3	−10.8 (4)	C10—C9—N4—C13	1.4 (5)
C1—C6—C7—O3	170.5 (3)	C8—C9—N4—C13	−178.6 (3)
C5—C6—C7—N3	170.3 (2)	C12—C13—N4—C9	−0.8 (6)
C1—C6—C7—N3	−8.4 (4)	C6—C1—O1—Zn1	151.87 (19)
N3—C8—C9—N4	−176.5 (3)	C2—C1—O1—Zn1	−30.4 (4)
N3—C8—C9—C10	3.5 (5)	N1—C14—O2—Zn1	168.55 (19)
N4—C9—C10—C11	−0.3 (5)	C2—C14—O2—Zn1	−11.5 (4)
C8—C9—C10—C11	179.7 (3)	C1—O1—Zn1—O4ⁱ	−143.2 (2)
C9—C10—C11—C12	−1.4 (5)	C1—O1—Zn1—O4	−59.2 (2)
C10—C11—C12—C13	1.9 (5)	C1—O1—Zn1—O2	31.3 (2)
C11—C12—C13—N4	−0.8 (6)	C1—O1—Zn1—O2ⁱ	125.8 (2)
C3—C2—C14—O2	−159.3 (3)	C14—O2—Zn1—O1	−9.8 (2)
C1—C2—C14—O2	22.2 (4)	C14—O2—Zn1—O1ⁱ	173.6 (2)
C3—C2—C14—N1	20.6 (4)	C14—O2—Zn1—O4ⁱ	19.8 (6)
C1—C2—C14—N1	−157.9 (2)	C14—O2—Zn1—O4	87.6 (2)
N1—C15—C16—N2	−127.8 (3)	C14—O2—Zn1—O2ⁱ	−101.9 (2)
N1—C15—C16—C17	51.7 (4)

Symmetry code: (i) −x, y, −z+1/2.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
N3—H3A···O1	0.86	1.93	2.623 (3)	136
N1—H1···N4ⁱⁱ	0.86	2.20	3.007 (4)	155
O4—H24···O3ⁱⁱⁱ	0.85	1.87	2.712 (3)	174
O4—H23···N2^iv	0.87	2.03	2.879 (3)	163

Symmetry codes: (ii) x+1/2, y+1/2, z; (iii) −x, −y, −z; (iv) −x+1/2, y−1/2, −z+1/2.

Experimental details

Crystal data
Chemical formula	[Zn(C₂₀H₁₇N₄O₃)₂(H₂O)₂]
M_r	824.18
Crystal system, space group	Monoclinic, C2/c
Temperature (K)	293
a, b, c (Å)	16.357 (4), 14.723 (4), 15.135 (4)
β (°)	91.938 (7)
V (Å³)	3642.9 (16)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	0.74
Crystal size (mm)	0.35 × 0.3 × 0.2

Data collection
Diffractometer	Bruker SMART APEX CCD area-detector diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 1996)
T_min, T_max	0.757, 0.854
No. of measured, independent and observed [I > 2σ(I)] reflections	21455, 4398, 3575
R_int	0.061
(sin θ/λ)_max (Å⁻¹)	0.661

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.060, 0.130, 1.11
No. of reflections	4398
No. of parameters	260
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.52, −0.42

Computer programs: SMART (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and Mercury (Macrae et al., 2006).

Selected geometric parameters (Å, º) top

O1—Zn1	1.9772 (18)	O4—Zn1	2.149 (2)
O2—Zn1	2.1572 (19)

O1—Zn1—O1ⁱ	175.44 (11)	O4—Zn1—O2	91.26 (8)
O1—Zn1—O4ⁱ	85.97 (8)	O1—Zn1—O2ⁱ	92.61 (8)
O1—Zn1—O4	97.42 (8)	O4—Zn1—O2ⁱ	168.82 (8)
O4ⁱ—Zn1—O4	84.55 (12)	O2—Zn1—O2ⁱ	94.67 (12)
O1—Zn1—O2	84.29 (7)

Symmetry code: (i) −x, y, −z+1/2.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
N3—H3A···O1	0.86	1.93	2.623 (3)	136
N1—H1···N4ⁱⁱ	0.86	2.20	3.007 (4)	155
O4—H24···O3ⁱⁱⁱ	0.85	1.87	2.712 (3)	174
O4—H23···N2^iv	0.87	2.03	2.879 (3)	163

Symmetry codes: (ii) x+1/2, y+1/2, z; (iii) −x, −y, −z; (iv) −x+1/2, y−1/2, −z+1/2.

Acknowledgements

Financial support from the Thailand Research Fund (MRG5080149 and RTA5080006) and the Centre of Innovation in Chemistry: Postgraduate Education and Research Program in Chemistry (PERCH-CIC) are gratefully acknowledged.

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