Bis(2-acetylpyridine-κ2N,O)silver(I) tetra­fluoridoborate: a complex with silver in a seesaw coordination geometry

O'Donnell, M.A.; Steel, P.J.

doi:10.1107/S1600536810048014

metal-organic compounds

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Volume 66| Part 12| December 2010| Page m1630

https://doi.org/10.1107/S1600536810048014

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Bis(2-acetylpyridine-κ²N,O)silver(I) tetrafluoridoborate: a complex with silver in a seesaw coordination geometry

Michael A. O'Donnell ^a and Peter J. Steel ^a ^*

^aChemistry Department, University of Canterbury, PO Box 4800, Christchurch, New Zealand
^*Correspondence e-mail: peter.steel@canterbury.ac.nz

(Received 11 November 2010; accepted 18 November 2010; online 24 November 2010)

The reaction of 2-acetylpyridine with silver(I) tetrafluoridoborate leads to the discrete title complex, [Ag(C₇H₇NO)₂]BF₄, in the cation of which the Ag atom is coordinated by two 2-acetylpyridine ligands, each of which is N,O-bidentate, albeit with stronger bonding to the N atoms [Ag—N = 2.2018 (15) and 2.2088 (14) Å; Ag—O = 2.5380 (13) and 2.5454 (13) Å]. The four-coordinate Ag atom has a seesaw coordination geometry with a τ₄ index of 0.51. The tetrafluoridoborate anion is disordered over two orientations with 0.568 (10):0.432 (10) occupancies.

Related literature

For other silver complexes with the same ligand, see: Bowmaker et al. (2005 ); Drew et al. (2005 ); Di Nicola et al. (2010 ). For examples of our previous work on silver complexes, see: Steel (2005 ); Fitchett & Steel (2006 ); O'Keefe & Steel (2007); Steel & Fitchett (2008 ); Golder et al. (2010 ). For details of the coordination geometry of four-coordinate silver, see: Young & Hanton (2008 ). For a definition of the τ₄ index, see: Yang et al. (2007 ). 2-acetylpyridine coordinates to a variety of transition metals, usually as an N,O-chelating ligand, although it has been reported to act as an O-monodentate donor to a zinc porphyrin, see: Byrn et al. (1993 ).

Experimental

Crystal data

[Ag(C₇H₇NO)₂]BF₄
M_r = 436.95
Triclinic, $[P \overline 1]$
a = 7.2635 (2) Å
b = 9.7091 (3) Å
c = 11.7390 (4) Å
α = 85.624 (2)°
β = 81.452 (2)°
γ = 75.054 (2)°
V = 790.34 (4) Å³
Z = 2
Mo Kα radiation
μ = 1.33 mm⁻¹
T = 116 K
0.37 × 0.36 × 0.14 mm

Data collection

Bruker SMART CCD area-detector diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2009 ) T_min = 0.805, T_max = 1.000
18086 measured reflections
3661 independent reflections
3255 reflections with I > 2σ(I)
R_int = 0.042

Refinement

R[F² > 2σ(F²)] = 0.024
wR(F²) = 0.051
S = 1.01
3661 reflections
247 parameters
H-atom parameters constrained
Δρ_max = 0.33 e Å⁻³
Δρ_min = −0.47 e Å⁻³

Table 1
Selected bond angles (°)

N9—Ag1—N1	165.92 (6)
N9—Ag1—O15	70.09 (5)
N1—Ag1—O15	122.03 (5)
N9—Ag1—O7	121.62 (5)
N1—Ag1—O7	69.62 (5)
O15—Ag1—O7	83.23 (5)

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

Supporting information

Crystal structure: contains datablocks global, I. DOI: https://doi.org/10.1107/S1600536810048014/zs2079sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810048014/zs2079Isup2.hkl

checkCIF report

Comment top

For some time we have been involved in the study of silver complexes of chelating and bridging heterocyclic ligands (Steel, 2005; Fitchett & Steel, 2006; O'Keefe & Steel, 2007; Steel & Fitchett, 2008; Golder et al., 2010). 2-acetylpyridine coordinates to a variety of transition metals, usually as an N,O-chelating ligand, although it has been reported to act as an O-monodentate donor to a zinc porphyrin (Byrn et al., 1993). X-ray crystal structures have been reported for complexes of 2-acetylpyridine with silver(I) perchlorate (Bowmaker et al., 2005; Drew et al., 2005), trifluoroacetate (Bowmaker et al., 2005), trifluoromethanesulfonate (Di Nicola et al., 2010) and nitrate (Bowmaker et al., 2005). The latter has a single 2-acetylpyridine bound to the silver with a chelating nitrate anion, while the others have two chelating 2-acetylpyridine ligands. We now report the structure of its complex with silver(I) tetrafluoridoborate, the title compound [Ag(C₇H₇NO)₂] BF₄ (I).

In (I), the asymmetric unit contains a complex cation comprising a silver(I) atom bound to two bidentate N,O-chelated 2-acetylpyridine ligands [Ag—N, 2.2018 (15), 2.2088 (14) Å; Ag—O, 2.5380 (13), 2.5454 (13) Å], and a tetrafluoridoborate counter-anion (Fig. 1). The tetrafluoridoborate anion is disordered over two orientations with relative F occupancies of 57:43% about a common central B. Since the silver atom makes no other contacts less than 2.72 Å it should be classified as four-coordinate (Young & Hanton, 2008). Calculation of the τ₄ index (Yang et al., 2007) produces a value of 0.51 which means that the geometry around the silver should be described as seesaw.

Related literature top

For other silver complexes with the same ligand, see: Bowmaker et al. (2005); Drew et al. (2005); Di Nicola et al. (2010). For examples of our previous work on silver complexes, see: Steel (2005); Fitchett & Steel (2006); O'Keefe & Steel (2007); Steel & Fitchett (2008); Golder et al. (2010). For four-coordinate silver geometry, see: Young & Hanton (2008). For a definition of the τ₄ index, see: Yang et al. (2007). 2-acetylpyridine coordinates to a variety of transition metals, usually as an N,O-chelating ligand, although it has been reported to act as an O-monodentate donor to a zinc porphyrin, see: Byrn et al. (1993).

Experimental top

The title compound was prepared by diffusion of pentane into a methanol solution of a mixture of 2-acetylpyridine and silver(I) tetrafluoridoborate.

Structure description top

For other silver complexes with the same ligand, see: Bowmaker et al. (2005); Drew et al. (2005); Di Nicola et al. (2010). For examples of our previous work on silver complexes, see: Steel (2005); Fitchett & Steel (2006); O'Keefe & Steel (2007); Steel & Fitchett (2008); Golder et al. (2010). For four-coordinate silver geometry, see: Young & Hanton (2008). For a definition of the τ₄ index, see: Yang et al. (2007). 2-acetylpyridine coordinates to a variety of transition metals, usually as an N,O-chelating ligand, although it has been reported to act as an O-monodentate donor to a zinc porphyrin, see: Byrn et al. (1993).

Computing details top

Data collection: SMART (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); 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

Fig. 1. The molecular structure of the title complex, showing displacement ellipsoids at the 50% probability level.

Bis(2-acetylpyridine-κ²N,O)silver(I) tetrafluoridoborate top

Crystal data top

[Ag(C₇H₇NO)₂]BF₄	Z = 2
M_r = 436.95	F(000) = 432
Triclinic, P1	D_x = 1.836 Mg m⁻³
Hall symbol: -P 1	Mo Kα radiation, λ = 0.71073 Å
a = 7.2635 (2) Å	Cell parameters from 8378 reflections
b = 9.7091 (3) Å	θ = 2.7–27.6°
c = 11.7390 (4) Å	µ = 1.33 mm⁻¹
α = 85.624 (2)°	T = 116 K
β = 81.452 (2)°	Block, colourless
γ = 75.054 (2)°	0.37 × 0.36 × 0.14 mm
V = 790.34 (4) Å³

Data collection top

Bruker SMART CCD area-detector diffractometer	3661 independent reflections
Radiation source: fine-focus sealed tube	3255 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.042
φ and ω scans	θ_max = 27.6°, θ_min = 2.7°
Absorption correction: multi-scan (SADABS; Bruker, 2009)	h = −9→9
T_min = 0.805, T_max = 1.000	k = −12→12
18086 measured reflections	l = −15→15

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)] = 0.024	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.051	H-atom parameters constrained
S = 1.01	w = 1/[σ²(F_o²) + (0.0251P)²] where P = (F_o² + 2F_c²)/3
3661 reflections	(Δ/σ)_max = 0.001
247 parameters	Δρ_max = 0.33 e Å⁻³
0 restraints	Δρ_min = −0.47 e Å⁻³

Crystal data top

[Ag(C₇H₇NO)₂]BF₄	γ = 75.054 (2)°
M_r = 436.95	V = 790.34 (4) Å³
Triclinic, P1	Z = 2
a = 7.2635 (2) Å	Mo Kα radiation
b = 9.7091 (3) Å	µ = 1.33 mm⁻¹
c = 11.7390 (4) Å	T = 116 K
α = 85.624 (2)°	0.37 × 0.36 × 0.14 mm
β = 81.452 (2)°

Data collection top

Bruker SMART CCD area-detector diffractometer	3661 independent reflections
Absorption correction: multi-scan (SADABS; Bruker, 2009)	3255 reflections with I > 2σ(I)
T_min = 0.805, T_max = 1.000	R_int = 0.042
18086 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.024	0 restraints
wR(F²) = 0.051	H-atom parameters constrained
S = 1.01	Δρ_max = 0.33 e Å⁻³
3661 reflections	Δρ_min = −0.47 e Å⁻³
247 parameters

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

	x	y	z	U_iso*/U_eq	Occ. (<1)
Ag1	0.62372 (2)	0.358455 (15)	0.216889 (12)	0.02670 (6)
N1	0.7431 (2)	0.40200 (16)	0.03743 (13)	0.0200 (3)
C2	0.8515 (3)	0.2955 (2)	−0.02733 (17)	0.0266 (4)
H2	0.8596	0.2001	0.0010	0.032*
C3	0.9529 (3)	0.3180 (3)	−0.13419 (18)	0.0338 (5)
H3	1.0279	0.2398	−0.1781	0.041*
C4	0.9425 (3)	0.4558 (3)	−0.17500 (17)	0.0350 (5)
H4	1.0125	0.4742	−0.2471	0.042*
C5	0.8291 (3)	0.5676 (2)	−0.10994 (16)	0.0279 (5)
H5	0.8186	0.6635	−0.1375	0.033*
C6	0.7311 (3)	0.53789 (19)	−0.00415 (15)	0.0200 (4)
O7	0.5413 (2)	0.62559 (14)	0.16893 (11)	0.0279 (3)
C7	0.6095 (3)	0.65429 (19)	0.07221 (16)	0.0227 (4)
C8	0.5744 (3)	0.8064 (2)	0.0268 (2)	0.0353 (5)
H8A	0.4863	0.8686	0.0840	0.053*
H8B	0.5175	0.8157	−0.0449	0.053*
H8C	0.6966	0.8340	0.0117	0.053*
N9	0.4948 (2)	0.26845 (16)	0.37767 (14)	0.0238 (4)
C10	0.3564 (3)	0.1997 (2)	0.37892 (17)	0.0281 (4)
H10	0.3117	0.1917	0.3082	0.034*
C11	0.2753 (3)	0.1397 (2)	0.47867 (18)	0.0299 (5)
H11	0.1757	0.0933	0.4765	0.036*
C12	0.3420 (3)	0.1486 (2)	0.58052 (17)	0.0299 (5)
H12	0.2899	0.1077	0.6500	0.036*
C13	0.4870 (3)	0.2183 (2)	0.58072 (16)	0.0262 (4)
H13	0.5360	0.2250	0.6502	0.031*
C14	0.5589 (3)	0.27780 (19)	0.47815 (15)	0.0211 (4)
O15	0.7480 (2)	0.43100 (16)	0.38824 (12)	0.0414 (4)
C15	0.7082 (3)	0.3619 (2)	0.47483 (16)	0.0235 (4)
C16	0.7981 (3)	0.3629 (2)	0.58006 (17)	0.0327 (5)
H16A	0.6993	0.4069	0.6420	0.049*
H16B	0.8956	0.4177	0.5638	0.049*
H16C	0.8587	0.2647	0.6040	0.049*
B25	0.9904 (3)	0.9500 (2)	0.7668 (2)	0.0297 (5)
F26	1.1442 (2)	0.96995 (15)	0.81393 (12)	0.0499 (4)
F27	1.0213 (7)	0.8050 (5)	0.7373 (6)	0.0530 (14)	0.568 (10)
F28	0.8389 (6)	0.9732 (7)	0.8535 (4)	0.0778 (17)	0.568 (10)
F29	0.9559 (8)	1.0366 (5)	0.6754 (4)	0.0486 (13)	0.568 (10)
F27'	0.8174 (6)	1.0520 (7)	0.7916 (8)	0.080 (3)	0.432 (10)
F28'	1.0393 (11)	0.9638 (11)	0.6459 (4)	0.059 (2)	0.432 (10)
F29'	0.9705 (11)	0.8213 (7)	0.7954 (6)	0.0507 (17)	0.432 (10)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Ag1	0.03524 (10)	0.02888 (9)	0.01804 (8)	−0.01335 (7)	−0.00432 (6)	0.00624 (6)
N1	0.0188 (8)	0.0235 (8)	0.0192 (8)	−0.0063 (7)	−0.0057 (6)	−0.0002 (6)
C2	0.0221 (11)	0.0319 (11)	0.0285 (10)	−0.0069 (9)	−0.0088 (8)	−0.0063 (8)
C3	0.0235 (11)	0.0533 (15)	0.0262 (11)	−0.0086 (10)	−0.0028 (8)	−0.0161 (10)
C4	0.0231 (11)	0.0685 (16)	0.0166 (10)	−0.0177 (11)	−0.0005 (8)	−0.0047 (10)
C5	0.0226 (11)	0.0441 (13)	0.0214 (10)	−0.0163 (9)	−0.0076 (8)	0.0088 (9)
C6	0.0176 (10)	0.0269 (10)	0.0183 (9)	−0.0094 (8)	−0.0073 (7)	0.0039 (7)
O7	0.0334 (8)	0.0262 (7)	0.0217 (7)	−0.0048 (6)	−0.0011 (6)	−0.0005 (6)
C7	0.0180 (10)	0.0233 (10)	0.0286 (10)	−0.0070 (8)	−0.0081 (8)	0.0038 (8)
C8	0.0332 (13)	0.0251 (11)	0.0470 (14)	−0.0087 (9)	−0.0058 (10)	0.0083 (9)
N9	0.0267 (9)	0.0215 (8)	0.0229 (8)	−0.0064 (7)	−0.0042 (7)	0.0035 (6)
C10	0.0287 (12)	0.0309 (11)	0.0270 (10)	−0.0101 (9)	−0.0074 (8)	0.0015 (8)
C11	0.0241 (11)	0.0300 (11)	0.0353 (12)	−0.0102 (9)	0.0027 (9)	−0.0001 (9)
C12	0.0320 (12)	0.0300 (11)	0.0261 (11)	−0.0109 (9)	0.0063 (8)	−0.0005 (8)
C13	0.0306 (12)	0.0272 (10)	0.0198 (10)	−0.0072 (9)	0.0008 (8)	−0.0031 (8)
C14	0.0235 (10)	0.0177 (9)	0.0198 (9)	−0.0026 (7)	−0.0008 (7)	0.0001 (7)
O15	0.0635 (11)	0.0464 (10)	0.0277 (8)	−0.0383 (9)	−0.0109 (7)	0.0100 (7)
C15	0.0271 (11)	0.0206 (9)	0.0219 (10)	−0.0050 (8)	−0.0008 (8)	−0.0030 (7)
C16	0.0323 (12)	0.0444 (13)	0.0245 (11)	−0.0153 (10)	−0.0037 (9)	−0.0002 (9)
B25	0.0255 (13)	0.0262 (12)	0.0366 (13)	−0.0086 (10)	−0.0009 (10)	0.0049 (10)
F26	0.0574 (10)	0.0577 (9)	0.0475 (9)	−0.0335 (8)	−0.0209 (7)	0.0115 (7)
F27	0.040 (2)	0.0249 (14)	0.099 (4)	−0.0053 (14)	−0.028 (2)	−0.003 (2)
F28	0.047 (2)	0.097 (4)	0.071 (3)	−0.009 (2)	0.0300 (17)	0.005 (2)
F29	0.060 (3)	0.043 (2)	0.051 (2)	−0.026 (2)	−0.022 (2)	0.0213 (17)
F27'	0.043 (3)	0.065 (4)	0.118 (7)	0.018 (2)	−0.011 (3)	−0.027 (4)
F28'	0.065 (4)	0.098 (6)	0.031 (2)	−0.053 (4)	−0.006 (2)	0.015 (3)
F29'	0.063 (4)	0.034 (3)	0.067 (4)	−0.030 (3)	−0.022 (3)	0.022 (3)

Geometric parameters (Å, º) top

Ag1—N1	2.2088 (14)	C10—C11	1.388 (3)
Ag1—N9	2.2018 (15)	C10—H10	0.9500
Ag1—O7	2.5454 (13)	C11—C12	1.372 (3)
Ag1—O15	2.5380 (15)	C11—H11	0.9500
N1—C2	1.338 (2)	C12—C13	1.391 (3)
N1—C6	1.357 (2)	C12—H12	0.9500
C2—C3	1.389 (3)	C13—C14	1.385 (2)
C2—H2	0.9500	C13—H13	0.9500
C3—C4	1.373 (3)	C14—C15	1.510 (3)
C3—H3	0.9500	O15—C15	1.215 (2)
C4—C5	1.385 (3)	C15—C16	1.482 (3)
C4—H4	0.9500	C16—H16A	0.9800
C5—C6	1.386 (2)	C16—H16B	0.9800
C5—H5	0.9500	C16—H16C	0.9800
C6—C7	1.505 (3)	B25—F29'	1.307 (6)
O7—C7	1.212 (2)	B25—F29	1.324 (4)
C7—C8	1.502 (2)	B25—F28	1.368 (4)
C8—H8A	0.9800	B25—F26	1.380 (3)
C8—H8B	0.9800	B25—F27'	1.393 (5)
C8—H8C	0.9800	B25—F28'	1.415 (5)
N9—C10	1.340 (2)	B25—F27	1.428 (5)
N9—C14	1.348 (2)

N9—Ag1—N1	165.92 (6)	N9—C10—C11	123.05 (19)
N9—Ag1—O15	70.09 (5)	N9—C10—H10	118.5
N1—Ag1—O15	122.03 (5)	C11—C10—H10	118.5
N9—Ag1—O7	121.62 (5)	C12—C11—C10	118.66 (19)
N1—Ag1—O7	69.62 (5)	C12—C11—H11	120.7
O15—Ag1—O7	83.23 (5)	C10—C11—H11	120.7
C2—N1—C6	118.14 (16)	C11—C12—C13	119.11 (17)
C2—N1—Ag1	120.49 (12)	C11—C12—H12	120.4
C6—N1—Ag1	120.74 (13)	C13—C12—H12	120.4
N1—C2—C3	122.97 (19)	C14—C13—C12	119.07 (19)
N1—C2—H2	118.5	C14—C13—H13	120.5
C3—C2—H2	118.5	C12—C13—H13	120.5
C4—C3—C2	118.6 (2)	N9—C14—C13	122.03 (17)
C4—C3—H3	120.7	N9—C14—C15	116.76 (15)
C2—C3—H3	120.7	C13—C14—C15	121.16 (18)
C3—C4—C5	119.31 (18)	C15—O15—Ag1	110.96 (13)
C3—C4—H4	120.3	O15—C15—C16	121.06 (18)
C5—C4—H4	120.3	O15—C15—C14	120.05 (18)
C4—C5—C6	119.22 (19)	C16—C15—C14	118.84 (15)
C4—C5—H5	120.4	C15—C16—H16A	109.5
C6—C5—H5	120.4	C15—C16—H16B	109.5
N1—C6—C5	121.73 (18)	H16A—C16—H16B	109.5
N1—C6—C7	116.32 (15)	C15—C16—H16C	109.5
C5—C6—C7	121.93 (17)	H16A—C16—H16C	109.5
C7—O7—Ag1	112.42 (12)	H16B—C16—H16C	109.5
O7—C7—C8	120.55 (19)	F29—B25—F28	112.6 (3)
O7—C7—C6	120.42 (16)	F29'—B25—F26	109.0 (3)
C8—C7—C6	119.04 (17)	F29—B25—F26	111.2 (2)
C7—C8—H8A	109.5	F28—B25—F26	105.6 (3)
C7—C8—H8B	109.5	F29'—B25—F27'	111.3 (4)
H8A—C8—H8B	109.5	F26—B25—F27'	115.8 (3)
C7—C8—H8C	109.5	F29'—B25—F28'	109.9 (4)
H8A—C8—H8C	109.5	F26—B25—F28'	105.7 (3)
H8B—C8—H8C	109.5	F27'—B25—F28'	104.8 (3)
C10—N9—C14	118.07 (16)	F29—B25—F27	110.4 (3)
C10—N9—Ag1	121.89 (13)	F28—B25—F27	105.7 (3)
C14—N9—Ag1	120.00 (12)	F26—B25—F27	111.2 (3)

Experimental details

Crystal data
Chemical formula	[Ag(C₇H₇NO)₂]BF₄
M_r	436.95
Crystal system, space group	Triclinic, P1
Temperature (K)	116
a, b, c (Å)	7.2635 (2), 9.7091 (3), 11.7390 (4)
α, β, γ (°)	85.624 (2), 81.452 (2), 75.054 (2)
V (Å³)	790.34 (4)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	1.33
Crystal size (mm)	0.37 × 0.36 × 0.14

Data collection
Diffractometer	Bruker SMART CCD area-detector
Absorption correction	Multi-scan (SADABS; Bruker, 2009)
T_min, T_max	0.805, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections	18086, 3661, 3255
R_int	0.042
(sin θ/λ)_max (Å⁻¹)	0.651

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.024, 0.051, 1.01
No. of reflections	3661
No. of parameters	247
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.33, −0.47

Computer programs: SMART (Bruker, 2009), SAINT (Bruker, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Selected bond angles (º) top

N9—Ag1—N1	165.92 (6)	N9—Ag1—O7	121.62 (5)
N9—Ag1—O15	70.09 (5)	N1—Ag1—O7	69.62 (5)
N1—Ag1—O15	122.03 (5)	O15—Ag1—O7	83.23 (5)

Acknowledgements

We thank the Chemistry Department, University of Canterbury, New Zealand, for funding.

References

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