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Acta Cryst. (2009). E65, m1339    [ doi:10.1107/S1600536809037532 ]

catena-Poly[[silver(I)-[mu]-dipyrazin-2-ylamine] perchlorate monohydrate]

W. F. Song, C.-Q. Wan and J. Liu

Abstract top

In the title complex, {[Ag(C8H7N5)]ClO4·H2O}n, the multidentate dipyrazin-2-ylamine acts as a [mu]2-bridging link with an anti-syn configuration, assembling the AgI ions into a zigzag chain structure. The AgI ion is linearly coordinated by two dipyrazin-2-ylamine ligands through two pyrazine N atoms. (ClO4-)...[pi](pyrazine) [O...centroid distances of 3.612 (3) and 3.664 (1) Å] and [pi]-[pi] interactions [centroid-centroid distance = 3.518 (2) Å] as well as O-H...O and N-H...O hydrogen-bonds assemble the chains into a three-dimensional supramolecular aggregation.

Comment top

The oligo-α-pyridylamino ligands are widely employed in the construction of diverse interesting metal-organic frameworks (Clérac et al., 2000, Chem et al., 2006). By using one or both nitrogen ligation sites in each heteroaromatic ring attached to the rotatable C–N(amine) bond, dipyrazin-2-ylamine (Hdpza) has led to several Cu(II), Co(II), Ni(II) and Cr(II) complexes (Ismayilov et al., 2007). Notably, π–acidic aromatic rings such as these N-rich heterocycles have been demonstrated to play an important role in supramolecular assemblies through anion–π interaction, which is of current interest (Egli et al., 2007, Mooibroek et al., 2008).

The asymmetric unit in the title silver(I) complex ([Ag(Hdpza)]+.ClO4-.H2O)∞ consists of an [Ag(Hdpza)]+ cationic group, accompanied by one perchlorate anion and one water solvate (Fig.1). Each AgI center is surrounded by two Hdpza with two 4-pyrazinyl N atoms [N1 and N3i, (i): –x + 3/2, -y + 1, z – 1/2] bonding to the metal, while the ligand exhibits as a µ2-bridging mode with the two 4-pyrazinyl N atoms as bonding sites to link the AgI ions into an infinite chain structure along the c axis (Fig.2). Cationic chains are stacked along the a axis and interconnect through π–π interactions (Fig. 2). In addition, a O(perchl)···π(pyrazine) interaction combines with O-H···O and N-H···O hydrogen-bonds (Table 1) to assemble the infinite chain motifs into a three-dimensional supramolecular structure .

Lattice water molecules and perchlorate anions are embedded within the interstices through O—H(water)···O(perchl) and N—H(amine)···O(water) H-bonding. The ClO4- anion simultaneously links three neighbouring chains through weak C—H···O(perchl) (C···O span: 3.446 (1) Å - 3.499 (2) Å ) and O(perchl) ···π interactions (O2···Cg: 3.612 (3) Å; O3···Cg: 3.664 (1) Å; Cg:the pyrazinyl ring centroid)

Related literature top

For oligo-α-pyridylamino metal-organic frameworks, see: Clérac et al. (2000); Chem et al. (2006). For other dipyrazin-2-ylamine (Hdpza)–metal complexes, see: Ismayilov et al. (2007). For supramolecular assemblies related to N-rich heterocycles, see: Egli et al. (2007); Mooibroek et al. (2008).

Experimental top

Hdpza was synthesized following literature procedures (Ismayilov et al., 2007). A mixture of Hdpza (100 mg, 0.58 mmol) and AgClO4.xH2O (172 mg) in methanol (40 ml) was stirred for five hours at room temperature. The resulting clear solution was filtered and then left to stand in air for about 7 days. Brown crystals suitable for X-ray diffraction (97.1 mg, 42% yield, on the basis of Hdpza) were obtained.

Refinement top

Hydrogen atoms attached to C were placed in idealized positions and allowed to ride on the corresponding carbon atoms, with C— H = 0.93 Å and Uiso(H) = 1.2Ueq(C). O-H's and N-H's were obtained from Fourier-difference maps, idealized with a O—H: 0.89 Å , N-H= 0.82 Å and allowed to ride with Uĩso~(H) = 1.5Ueq(O).

Computing details top

Data collection: SMART (Bruker, 1998); cell refinement: SMART (Bruker, 1998); data reduction: SAINT (Bruker, 1998); 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) and PLATON (Spek, 2009).

Figures top
[Figure 1] Fig. 1. Ellipsoid plot (at the 50% probability level) and atomic numbering scheme of the title complex. [Symmetry code: (i) –x + 3/2, –y + 1, z – 1/2]
[Figure 2] Fig. 2. The cationic layer formed by one-dimensional chains linked through π–π interactions. All hydrogen atoms are omitted for clarity. The red dashed lines indicate the π–π interactions.
catena-Poly[[silver(I)-µ-dipyrazin-2-ylamine] perchlorate monohydrate] top
Crystal data top
[Ag(C8H7N5)]ClO4·H2OF(000) = 1568
Mr = 398.52Dx = 2.079 Mg m−3
Orthorhombic, PbcaMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ac 2abCell parameters from 834 reflections
a = 9.035 (4) Åθ = 3.0–28.1°
b = 15.188 (6) ŵ = 1.82 mm−1
c = 18.556 (7) ÅT = 293 K
V = 2546.4 (17) Å3Block, brown
Z = 80.51 × 0.41 × 0.30 mm
Data collection top
Bruker SMART CCD area-detector
diffractometer		3144 independent reflections
Radiation source: fine-focus sealed tube1786 reflections with I > 2σ(I)
graphiteRint = 0.088
area detector ω scansθmax = 28.3°, θmin = 2.2°
Absorption correction: multi-scan
(SADABS; Bruker, 1998)		h = −12→11
Tmin = 0.36, Tmax = 0.58k = −11→20
16026 measured reflectionsl = −24→24
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.068Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.222H-atom parameters constrained
S = 1.01 w = 1/[σ2(Fo2) + (0.1002P)2 + 6.7959P]
where P = (Fo2 + 2Fc2)/3
3144 reflections(Δ/σ)max = 0.006
181 parametersΔρmax = 1.68 e Å−3
0 restraintsΔρmin = −1.19 e Å−3
Crystal data top
[Ag(C8H7N5)]ClO4·H2OV = 2546.4 (17) Å3
Mr = 398.52Z = 8
Orthorhombic, PbcaMo Kα radiation
a = 9.035 (4) ŵ = 1.82 mm−1
b = 15.188 (6) ÅT = 293 K
c = 18.556 (7) Å0.51 × 0.41 × 0.30 mm
Data collection top
Bruker SMART CCD area-detector
diffractometer		3144 independent reflections
Absorption correction: multi-scan
(SADABS; Bruker, 1998)		1786 reflections with I > 2σ(I)
Tmin = 0.36, Tmax = 0.58Rint = 0.088
16026 measured reflectionsθmax = 28.3°
Refinement top
R[F2 > 2σ(F2)] = 0.068H-atom parameters constrained
wR(F2) = 0.222Δρmax = 1.68 e Å−3
S = 1.01Δρmin = −1.19 e Å−3
3144 reflectionsAbsolute structure: ?
181 parametersFlack parameter: ?
0 restraintsRogers parameter: ?
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
Ag10.60110 (7)0.60171 (5)0.51698 (3)0.0574 (3)
N10.5177 (6)0.6250 (4)0.6240 (3)0.0412 (13)
N20.4261 (7)0.6635 (4)0.7632 (3)0.0506 (15)
N30.8334 (7)0.4221 (4)0.9068 (3)0.0454 (14)
N40.7495 (6)0.4621 (4)0.7658 (3)0.0408 (12)
N50.5746 (7)0.5612 (5)0.8128 (3)0.0473 (15)
H50.53300.57100.85100.0541*
C10.4145 (8)0.6856 (5)0.6372 (4)0.0516 (18)
H10.37210.71580.59880.062*
C20.3696 (9)0.7046 (6)0.7056 (5)0.059 (2)
H20.29740.74740.71250.071*
C30.5257 (7)0.6012 (4)0.7511 (4)0.0402 (14)
C40.5741 (7)0.5822 (5)0.6807 (4)0.0398 (15)
H40.64620.53940.67350.048*
C50.6845 (7)0.4989 (5)0.8220 (3)0.0396 (14)
C60.7255 (7)0.4780 (5)0.8932 (3)0.0442 (16)
H60.67530.50420.93140.053*
C70.9000 (7)0.3833 (5)0.8487 (4)0.0442 (16)
H70.97520.34240.85610.053*
C80.8579 (8)0.4036 (5)0.7806 (4)0.0477 (17)
H80.90560.37600.74240.057*
Cl10.1976 (2)0.65255 (13)0.43336 (10)0.0500 (5)
O10.1650 (12)0.7083 (6)0.4943 (4)0.110 (3)
O20.0655 (9)0.6109 (6)0.4123 (6)0.115 (3)
O30.2520 (7)0.7041 (4)0.3752 (3)0.0724 (17)
O40.3014 (9)0.5867 (5)0.4522 (5)0.102 (3)
O1W0.3945 (6)0.6282 (5)0.9308 (3)0.0656 (16)
H1WB0.37150.67320.90230.098*
H1WA0.42490.63350.97620.098*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Ag10.0662 (5)0.0630 (5)0.0431 (4)0.0062 (3)0.0078 (3)0.0003 (3)
N10.041 (3)0.036 (3)0.047 (3)0.003 (2)0.000 (2)0.002 (2)
N20.052 (4)0.046 (4)0.054 (4)0.015 (3)0.004 (3)−0.005 (3)
N30.048 (3)0.045 (4)0.043 (3)−0.003 (3)−0.004 (3)0.003 (3)
N40.048 (3)0.033 (3)0.042 (3)0.006 (2)0.003 (2)−0.001 (2)
N50.049 (3)0.054 (4)0.039 (3)0.018 (3)0.002 (3)0.002 (3)
C10.050 (4)0.047 (5)0.058 (4)0.005 (3)−0.003 (3)0.013 (4)
C20.064 (5)0.045 (5)0.069 (5)0.021 (4)0.007 (4)0.006 (4)
C30.041 (4)0.035 (4)0.044 (3)0.001 (3)0.003 (3)−0.003 (3)
C40.034 (3)0.040 (4)0.046 (4)0.004 (3)−0.001 (3)−0.007 (3)
C50.038 (3)0.039 (4)0.042 (3)0.001 (3)0.004 (3)−0.001 (3)
C60.046 (4)0.050 (4)0.037 (3)0.001 (3)0.004 (3)−0.007 (3)
C70.042 (4)0.038 (4)0.052 (4)0.001 (3)−0.002 (3)−0.005 (3)
C80.048 (4)0.046 (4)0.049 (4)0.005 (3)−0.005 (3)−0.008 (3)
Cl10.0486 (9)0.0443 (10)0.0570 (10)−0.0022 (8)−0.0001 (8)0.0074 (8)
O10.163 (8)0.095 (7)0.072 (4)−0.002 (6)0.036 (5)−0.012 (4)
O20.074 (5)0.111 (7)0.161 (9)−0.039 (5)−0.023 (5)0.010 (6)
O30.089 (4)0.059 (4)0.070 (4)0.001 (3)0.022 (3)0.013 (3)
O40.095 (5)0.080 (5)0.131 (7)0.034 (4)0.014 (5)0.053 (5)
O1W0.069 (4)0.070 (4)0.058 (3)0.016 (3)−0.003 (3)−0.003 (3)
Geometric parameters (Å, °) top
Ag1—N12.153 (6)C1—H10.9300
Ag1—N3i2.160 (6)C2—H20.9300
N1—C11.334 (9)C3—C41.407 (10)
N1—C41.337 (9)C4—H40.9300
N2—C31.325 (9)C5—C61.408 (9)
N2—C21.338 (10)C6—H60.9300
N3—C61.317 (9)C7—C81.355 (11)
N3—C71.368 (10)C7—H70.9300
N3—Ag1ii2.160 (6)C8—H80.9300
N4—C51.321 (8)Cl1—O21.406 (8)
N4—C81.350 (9)Cl1—O41.415 (7)
N5—C31.370 (9)Cl1—O31.420 (6)
N5—C51.382 (9)Cl1—O11.444 (8)
N5—H50.8200O1W—H1WB0.8900
C1—C21.364 (12)O1W—H1WA0.8900
N1—Ag1—N3i175.4 (2)N1—C4—H4119.6
C1—N1—C4117.2 (6)C3—C4—H4119.6
C1—N1—Ag1121.8 (5)N4—C5—N5120.8 (6)
C4—N1—Ag1120.8 (4)N4—C5—C6121.9 (6)
C3—N2—C2117.1 (7)N5—C5—C6117.3 (6)
C6—N3—C7117.0 (6)N3—C6—C5121.2 (6)
C6—N3—Ag1ii119.5 (5)N3—C6—H6119.4
C7—N3—Ag1ii123.5 (5)C5—C6—H6119.4
C5—N4—C8116.1 (6)C8—C7—N3120.8 (7)
C3—N5—C5129.7 (6)C8—C7—H7119.6
C3—N5—H5120.0N3—C7—H7119.6
C5—N5—H5110.1N4—C8—C7122.9 (7)
N1—C1—C2121.6 (7)N4—C8—H8118.5
N1—C1—H1119.2C7—C8—H8118.5
C2—C1—H1119.2O2—Cl1—O4108.2 (6)
N2—C2—C1122.1 (7)O2—Cl1—O3109.3 (5)
N2—C2—H2119.0O4—Cl1—O3110.3 (4)
C1—C2—H2118.9O2—Cl1—O1108.0 (6)
N2—C3—N5113.2 (6)O4—Cl1—O1110.9 (6)
N2—C3—C4121.0 (7)O3—Cl1—O1110.0 (5)
N5—C3—C4125.8 (6)H1WB—O1W—H1WA124.5
N1—C4—C3120.8 (6)
C4—N1—C1—C21.0 (11)C8—N4—C5—N5178.5 (7)
Ag1—N1—C1—C2−175.2 (6)C8—N4—C5—C6−0.3 (10)
C3—N2—C2—C1−1.8 (13)C3—N5—C5—N4−7.3 (12)
N1—C1—C2—N20.0 (13)C3—N5—C5—C6171.5 (7)
C2—N2—C3—N5−178.4 (7)C7—N3—C6—C5−2.2 (10)
C2—N2—C3—C42.7 (11)Ag1ii—N3—C6—C5176.6 (5)
C5—N5—C3—N2−174.7 (7)N4—C5—C6—N31.7 (11)
C5—N5—C3—C44.1 (13)N5—C5—C6—N3−177.1 (7)
C1—N1—C4—C3−0.1 (10)C6—N3—C7—C81.4 (10)
Ag1—N1—C4—C3176.2 (5)Ag1ii—N3—C7—C8−177.3 (5)
N2—C3—C4—N1−1.8 (10)C5—N4—C8—C7−0.4 (11)
N5—C3—C4—N1179.4 (7)N3—C7—C8—N4−0.1 (12)
Symmetry codes: (i) −x+3/2, −y+1, z−1/2; (ii) −x+3/2, −y+1, z+1/2.
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N5—H5···O1Wi0.822.122.911 (1)162
O1W—H1WB···O3iii0.892.213.036 (9)154
O1W—H1WA···O2iv0.892.453.306 (14)161
O1W—H1WA···O1iv0.892.513.063 (11)121
Symmetry codes: i; (iii) x, −y+3/2, z+1/2; (iv) x+1/2, y, −z+3/2.
Table 1
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N5—H5···O1Wi0.822.122.911 (1)162
O1W—H1WB···O3i0.892.213.036 (9)154
O1W—H1WA···O2ii0.892.453.306 (14)161
O1W—H1WA···O1ii0.892.513.063 (11)121
Symmetry codes: i; (i) x, −y+3/2, z+1/2; (ii) x+1/2, y, −z+3/2.
Acknowledgements top

The authors are grateful for financial support from the Science and Technology Program of Guangdong Province (2006B36701002).

references
References top

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