Bis[diamminesilver(I)] dioxalatoplatinate(II)

In the title compound, [Ag(NH₃)₂]₂[Pt(C₂O₄)₂], the Ag atom is coordinated in an almost linear configuration by two N atoms from two ammine ligands. The Pt atom, located on an inversion centre, is tetra­coordinated by four O atoms from two oxalate ions. The silver cations and platinum-centred anions are each stacked separately in a columnar fashion along the a axis. In the crystal structure, the cations and anions are further linked together through N—H...O hydrogen bonds, forming a three-dimensional structure.

Key indicators

• Single-crystal X-ray study
• T = 120 K
• Mean [sigma](C-C) = 0.008 Å
• R factor = 0.024
• wR factor = 0.062
• Data-to-parameter ratio = 12.5

checkCIF/PLATON results

No syntax errors found



Alert level C
PLAT042_ALERT_1_C Calc. and Rep. MoietyFormula Strings Differ ....          ?
PLAT062_ALERT_4_C Rescale T(min) & T(max) by .....................       0.74
PLAT369_ALERT_2_C Long   C(sp2)-C(sp2) Bond  C1     -   C2_a   ...       1.54 Ang.

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      0.740
            Tmax scaled      0.250 Tmin scaled      0.061

   0 ALERT level A = In general: serious problem
   0 ALERT level B = Potentially serious problem
   3 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
   1 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
   1 ALERT type 4 Improvement, methodology, query or suggestion

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Computing details

Data collection: SMART (Bruker, 1998); cell refinement: SMART; data reduction: SAINT (Bruker, 1998); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997a); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997a); molecular graphics: SHELXTL (Sheldrick, 1997b); software used to prepare material for publication: SHELXTL.

Bis[diamminesilver(I)] dioxalatoplatinate(II)

Crystal data

[Ag(NH3)2]2·[Pt(C2O4)2]	F(000) = 600
Mr = 655.01	Dx = 3.376 Mg m^−3
Monoclinic, P21/n	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2yn	Cell parameters from 929 reflections
a = 3.5857 (11) Å	θ = 2.2–19.9°
b = 9.014 (3) Å	µ = 13.88 mm^−1
c = 19.936 (6) Å	T = 120 K
β = 90.284 (5)°	Needle, yellow
V = 644.4 (4) Å^3	0.36 × 0.12 × 0.10 mm
Z = 2

Data collection

Bruker SMART CCD area-detector diffractometer	1135 independent reflections
Radiation source: fine-focus sealed tube	1082 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.050
φ and ω scans	θmax = 25.0°, θmin = 2.0°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −4→4
Tmin = 0.082, Tmax = 0.338	k = −10→10
3232 measured reflections	l = −23→18

Refinement

Refinement on F^2	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F^2 > 2σ(F^2)] = 0.024	H-atom parameters constrained
wR(F^2) = 0.062	w = 1/[σ^2(Fo^2) + (0.0351P)^2 + 1.6017P] where P = (Fo^2 + 2Fc^2)/3
S = 1.09	(Δ/σ)max = 0.001
1135 reflections	Δρmax = 1.83 e Å^−3
91 parameters	Δρmin = −1.02 e Å^−3
0 restraints	Extinction correction: SHELXL97, Fc^*=kFc[1+0.001xFc^2λ^3/sin(2θ)]^-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.0040 (5)

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
Ag	0.83142 (12)	0.76654 (5)	0.83595 (2)	0.02382 (18)
C1	−0.0717 (15)	0.2574 (6)	0.4141 (3)	0.0194 (12)
C2	0.1832 (14)	0.6057 (6)	0.6279 (3)	0.0169 (11)
N1	0.6835 (13)	0.8792 (5)	0.7464 (2)	0.0237 (10)
H1A	0.5244	0.8219	0.7219	0.036*
H1B	0.8924	0.8977	0.7221	0.036*
H1C	0.5700	0.9665	0.7568	0.036*
N2	0.9357 (13)	0.6307 (6)	0.9208 (2)	0.0283 (11)
H2A	0.7247	0.6236	0.9458	0.042*
H2B	1.1213	0.6715	0.9461	0.042*
H2C	1.0059	0.5386	0.9070	0.042*
O1	0.0473 (11)	0.2850 (4)	0.4745 (2)	0.0205 (8)
O2	−0.0907 (11)	0.1328 (4)	0.38936 (19)	0.0243 (9)
O3	0.1518 (12)	0.4792 (4)	0.5971 (2)	0.0192 (9)
O4	0.2910 (11)	0.6198 (4)	0.68547 (18)	0.0234 (9)
Pt	0.0000	0.5000	0.5000	0.01440 (16)

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Ag	0.0280 (3)	0.0201 (3)	0.0233 (3)	−0.00046 (18)	0.00222 (18)	−0.00245 (16)
C1	0.022 (3)	0.016 (3)	0.020 (3)	−0.001 (2)	0.001 (2)	0.002 (2)
C2	0.016 (2)	0.016 (3)	0.019 (3)	−0.001 (2)	0.002 (2)	0.002 (2)
N1	0.021 (2)	0.030 (3)	0.021 (2)	−0.001 (2)	0.0002 (19)	−0.001 (2)
N2	0.022 (2)	0.033 (3)	0.029 (3)	−0.001 (2)	0.003 (2)	0.005 (2)
O1	0.030 (2)	0.0125 (19)	0.019 (2)	0.0019 (16)	−0.0058 (15)	−0.0002 (15)
O2	0.035 (2)	0.017 (2)	0.021 (2)	0.0025 (17)	−0.0017 (17)	−0.0022 (16)
O3	0.027 (2)	0.0134 (19)	0.017 (2)	0.0015 (15)	−0.0009 (17)	0.0027 (14)
O4	0.030 (2)	0.021 (2)	0.019 (2)	−0.0001 (17)	−0.0058 (16)	0.0002 (15)
Pt	0.0180 (2)	0.0122 (2)	0.0130 (2)	−0.00024 (9)	0.00120 (12)	0.00097 (9)

Geometric parameters (Å, º)

Ag—N1	2.119 (5)	N1—H1B	0.9100
Ag—N2	2.121 (5)	N1—H1C	0.9100
C1—O2	1.228 (7)	N2—H2A	0.9100
C1—O1	1.300 (7)	N2—H2B	0.9100
C1—C2^i	1.543 (7)	N2—H2C	0.9100
C2—O4	1.215 (7)	O1—Pt	2.011 (4)
C2—O3	1.301 (7)	O3—Pt	2.017 (4)
C2—C1^i	1.543 (7)	Pt—O1^i	2.011 (4)
N1—H1A	0.9100	Pt—O3^i	2.017 (4)
N1—Ag—N2	172.5 (2)	Ag—N2—H2B	109.5
O2—C1—O1	124.3 (5)	H2A—N2—H2B	109.5
O2—C1—C2^i	120.0 (5)	Ag—N2—H2C	109.5
O1—C1—C2^i	115.6 (4)	H2A—N2—H2C	109.5
O4—C2—O3	124.4 (5)	H2B—N2—H2C	109.5
O4—C2—C1^i	120.6 (5)	C1—O1—Pt	113.0 (3)
O3—C2—C1^i	115.0 (5)	C2—O3—Pt	113.2 (3)
Ag—N1—H1A	109.5	O1—Pt—O1^i	180.0
Ag—N1—H1B	109.5	O1—Pt—O3	97.47 (15)
H1A—N1—H1B	109.5	O1^i—Pt—O3	82.53 (15)
Ag—N1—H1C	109.5	O1—Pt—O3^i	82.53 (15)
H1A—N1—H1C	109.5	O1^i—Pt—O3^i	97.47 (15)
H1B—N1—H1C	109.5	O3—Pt—O3^i	180.0
Ag—N2—H2A	109.5
O2—C1—O1—Pt	−175.4 (5)	C1—O1—Pt—O3	173.3 (4)
C2^i—C1—O1—Pt	6.2 (6)	C1—O1—Pt—O3^i	−6.7 (4)
O4—C2—O3—Pt	−175.8 (4)	C2—O3—Pt—O1	174.1 (4)
C1^i—C2—O3—Pt	4.2 (6)	C2—O3—Pt—O1^i	−5.9 (4)

Symmetry code: (i) −x, −y+1, −z+1.

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N2—H2C···O2^ii	0.91	2.15	2.988 (7)	153
N2—H2B···O1^iii	0.91	2.22	3.112 (6)	165
N2—H2A···O1^iv	0.91	2.37	3.053 (7)	132
N1—H1C···O4^iv	0.91	2.22	3.077 (6)	157
N1—H1B···O2^v	0.91	2.35	3.084 (6)	137
N1—H1A···O4	0.91	2.13	2.985 (6)	156

Symmetry codes: (ii) x+3/2, −y+1/2, z+1/2; (iii) −x+3/2, y+1/2, −z+3/2; (iv) −x+1/2, y+1/2, −z+3/2; (v) −x+1, −y+1, −z+1.