Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807052841/kp2139sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807052841/kp2139Isup2.hkl |
CCDC reference: 672575
KAgI2 was prepared by dropping excessive KI/DMF solution into AgNO3/DMF solution.The title compound was synthesized by CdI2(0.074 g) and 2,2'-bipyridine (0.015 g) dissolved in DMF (2.5 ml) followed by dropping the KAgI2(4 ml) solution.The mixture was stirred for 2 m and then filtered off. The filtrate was kept at room temperature for five days and the deep-brown block crystals were obtained. Crystals were washed with ethanol and then with water.
H atoms were positioned geometrically with C—H = 0.93Å and allowed to ride during subsequent refinement with Uiso(H)=1.2Ueq(C).
Data collection: SMART; cell refinement: SMART; data reduction: SMART; 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 (Sheldrick, 1997b).
[Ag2Cd2I6(C10H8N2)4] | F(000) = 1672 |
Mr = 1826.68 | Dx = 2.468 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
a = 8.9170 (6) Å | Cell parameters from 6188 reflections |
b = 21.5098 (15) Å | θ = 2.5–26.3° |
c = 12.8527 (9) Å | µ = 5.44 mm−1 |
β = 94.374 (4)° | T = 293 K |
V = 2458.0 (3) Å3 | Block, brown |
Z = 2 | 0.20 × 0.15 × 0.15 mm |
Bruker SMART APEXII CCD diffractometer | 4890 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.045 |
Graphite monochromator | θmax = 28.5°, θmin = 2.5° |
ϕ and ω scans | h = −11→11 |
14678 measured reflections | k = −25→28 |
6188 independent reflections | l = −17→17 |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.044 | H-atom parameters constrained |
wR(F2) = 0.121 | w = 1/[σ2(Fo2) + (0.0653P)2 + 1.6703P] where P = (Fo2 + 2Fc2)/3 |
S = 1.00 | (Δ/σ)max = 0.001 |
6188 reflections | Δρmax = 1.19 e Å−3 |
263 parameters | Δρmin = −1.02 e Å−3 |
0 restraints | Extinction correction: SHELXL97 (Sheldrick, 1997), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0073 (3) |
[Ag2Cd2I6(C10H8N2)4] | V = 2458.0 (3) Å3 |
Mr = 1826.68 | Z = 2 |
Monoclinic, P21/n | Mo Kα radiation |
a = 8.9170 (6) Å | µ = 5.44 mm−1 |
b = 21.5098 (15) Å | T = 293 K |
c = 12.8527 (9) Å | 0.20 × 0.15 × 0.15 mm |
β = 94.374 (4)° |
Bruker SMART APEXII CCD diffractometer | 4890 reflections with I > 2σ(I) |
14678 measured reflections | Rint = 0.045 |
6188 independent reflections |
R[F2 > 2σ(F2)] = 0.044 | 0 restraints |
wR(F2) = 0.121 | H-atom parameters constrained |
S = 1.00 | Δρmax = 1.19 e Å−3 |
6188 reflections | Δρmin = −1.02 e Å−3 |
263 parameters |
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. |
x | y | z | Uiso*/Ueq | ||
Cd1 | 0.82840 (5) | 0.162316 (19) | 0.20025 (3) | 0.04285 (13) | |
I1 | 0.68673 (5) | 0.04486 (2) | 0.25574 (3) | 0.06171 (15) | |
I2 | 0.98594 (5) | 0.18259 (2) | 0.39736 (3) | 0.05907 (15) | |
I3 | 0.80925 (5) | 0.01176 (2) | 0.60922 (3) | 0.05752 (15) | |
Ag1 | 0.92118 (7) | 0.05126 (3) | 0.42222 (4) | 0.06661 (17) | |
N1 | 0.8859 (7) | 0.2636 (3) | 0.1342 (4) | 0.0571 (13) | |
N2 | 0.6309 (6) | 0.2308 (3) | 0.2223 (4) | 0.0583 (14) | |
N3 | 1.0127 (5) | 0.1145 (2) | 0.1076 (4) | 0.0456 (11) | |
N4 | 0.7331 (6) | 0.1421 (2) | 0.0239 (4) | 0.0494 (11) | |
C1 | 0.7836 (9) | 0.3074 (3) | 0.1394 (5) | 0.0608 (18) | |
C2 | 0.8089 (12) | 0.3669 (4) | 0.1002 (7) | 0.087 (3) | |
H2A | 0.7350 | 0.3973 | 0.1027 | 0.104* | |
C3 | 0.9371 (15) | 0.3803 (5) | 0.0595 (9) | 0.111 (4) | |
H3A | 0.9542 | 0.4203 | 0.0354 | 0.134* | |
C4 | 1.0433 (14) | 0.3358 (5) | 0.0530 (8) | 0.099 (3) | |
H4A | 1.1337 | 0.3442 | 0.0243 | 0.118* | |
C5 | 1.0125 (10) | 0.2774 (4) | 0.0907 (6) | 0.078 (2) | |
H5A | 1.0838 | 0.2462 | 0.0854 | 0.094* | |
C6 | 0.6409 (8) | 0.2892 (3) | 0.1866 (5) | 0.0616 (18) | |
C7 | 0.5247 (13) | 0.3303 (5) | 0.1890 (7) | 0.095 (3) | |
H7A | 0.5325 | 0.3705 | 0.1634 | 0.113* | |
C8 | 0.3968 (15) | 0.3105 (6) | 0.2302 (9) | 0.108 (4) | |
H8A | 0.3153 | 0.3374 | 0.2310 | 0.129* | |
C9 | 0.3850 (10) | 0.2524 (7) | 0.2702 (8) | 0.106 (4) | |
H9A | 0.2980 | 0.2396 | 0.2996 | 0.128* | |
C10 | 0.5080 (9) | 0.2125 (5) | 0.2658 (7) | 0.080 (2) | |
H10A | 0.5037 | 0.1727 | 0.2937 | 0.096* | |
C11 | 0.5951 (8) | 0.1549 (4) | −0.0136 (5) | 0.0624 (17) | |
H11A | 0.5384 | 0.1823 | 0.0234 | 0.075* | |
C12 | 0.5298 (9) | 0.1296 (4) | −0.1058 (6) | 0.072 (2) | |
H12A | 0.4315 | 0.1392 | −0.1297 | 0.086* | |
C13 | 0.6148 (10) | 0.0904 (4) | −0.1598 (5) | 0.073 (2) | |
H13A | 0.5751 | 0.0727 | −0.2219 | 0.087* | |
C14 | 0.7597 (9) | 0.0772 (4) | −0.1222 (5) | 0.0649 (18) | |
H14A | 0.8182 | 0.0499 | −0.1579 | 0.078* | |
C15 | 0.8172 (7) | 0.1048 (3) | −0.0312 (4) | 0.0465 (13) | |
C16 | 1.1535 (7) | 0.1061 (3) | 0.1497 (6) | 0.0584 (15) | |
H16A | 1.1784 | 0.1189 | 0.2179 | 0.070* | |
C17 | 1.2614 (9) | 0.0791 (4) | 0.0943 (7) | 0.071 (2) | |
H17A | 1.3587 | 0.0741 | 0.1247 | 0.086* | |
C18 | 1.2264 (9) | 0.0599 (4) | −0.0041 (7) | 0.074 (2) | |
H18A | 1.2998 | 0.0416 | −0.0417 | 0.089* | |
C19 | 1.0838 (9) | 0.0669 (3) | −0.0490 (6) | 0.068 (2) | |
H19A | 1.0582 | 0.0532 | −0.1167 | 0.081* | |
C20 | 0.9763 (7) | 0.0957 (3) | 0.0103 (4) | 0.0483 (13) |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cd1 | 0.0466 (2) | 0.0396 (2) | 0.0428 (2) | 0.00666 (17) | 0.00627 (16) | −0.00090 (15) |
I2 | 0.0791 (3) | 0.0469 (3) | 0.0492 (2) | −0.0079 (2) | −0.00834 (19) | −0.00098 (16) |
I3 | 0.0673 (3) | 0.0548 (3) | 0.0524 (2) | 0.0105 (2) | 0.01750 (19) | −0.00039 (17) |
I1 | 0.0624 (3) | 0.0576 (3) | 0.0635 (3) | −0.0183 (2) | −0.0058 (2) | 0.00984 (19) |
Ag1 | 0.0715 (4) | 0.0658 (4) | 0.0631 (3) | 0.0075 (3) | 0.0083 (3) | 0.0091 (2) |
N3 | 0.048 (3) | 0.041 (3) | 0.050 (2) | 0.006 (2) | 0.016 (2) | 0.0011 (19) |
N4 | 0.058 (3) | 0.048 (3) | 0.043 (2) | 0.002 (2) | 0.006 (2) | 0.005 (2) |
N2 | 0.045 (3) | 0.072 (4) | 0.057 (3) | 0.015 (3) | 0.000 (2) | −0.011 (3) |
N1 | 0.070 (3) | 0.044 (3) | 0.056 (3) | 0.002 (3) | −0.004 (3) | 0.002 (2) |
C15 | 0.063 (4) | 0.036 (3) | 0.041 (2) | −0.011 (3) | 0.010 (2) | 0.002 (2) |
C6 | 0.074 (4) | 0.051 (4) | 0.056 (3) | 0.025 (3) | −0.017 (3) | −0.021 (3) |
C20 | 0.059 (3) | 0.037 (3) | 0.052 (3) | −0.003 (3) | 0.024 (3) | 0.003 (2) |
C1 | 0.084 (5) | 0.037 (3) | 0.056 (3) | 0.008 (3) | −0.028 (3) | −0.004 (3) |
C16 | 0.048 (3) | 0.052 (4) | 0.076 (4) | 0.004 (3) | 0.003 (3) | 0.000 (3) |
C14 | 0.083 (5) | 0.066 (5) | 0.047 (3) | −0.015 (4) | 0.011 (3) | −0.001 (3) |
C19 | 0.090 (6) | 0.052 (4) | 0.066 (4) | −0.001 (4) | 0.037 (4) | −0.005 (3) |
C11 | 0.063 (4) | 0.064 (4) | 0.059 (3) | −0.001 (3) | −0.004 (3) | 0.007 (3) |
C18 | 0.066 (5) | 0.060 (5) | 0.103 (6) | 0.007 (4) | 0.044 (4) | −0.003 (4) |
C17 | 0.058 (4) | 0.054 (4) | 0.104 (6) | 0.007 (3) | 0.022 (4) | −0.003 (4) |
C12 | 0.068 (4) | 0.086 (6) | 0.060 (4) | −0.029 (4) | −0.004 (3) | 0.015 (4) |
C5 | 0.084 (5) | 0.071 (5) | 0.082 (5) | −0.020 (4) | 0.017 (4) | 0.003 (4) |
C13 | 0.098 (6) | 0.077 (5) | 0.043 (3) | −0.036 (5) | 0.002 (4) | −0.002 (3) |
C10 | 0.060 (4) | 0.094 (7) | 0.089 (5) | 0.014 (4) | 0.019 (4) | −0.018 (5) |
C7 | 0.106 (7) | 0.079 (6) | 0.093 (6) | 0.053 (6) | −0.027 (6) | −0.036 (5) |
C2 | 0.104 (7) | 0.039 (4) | 0.107 (6) | 0.011 (4) | −0.051 (6) | 0.003 (4) |
C9 | 0.054 (5) | 0.160 (12) | 0.107 (7) | 0.014 (6) | 0.018 (5) | −0.053 (8) |
C8 | 0.114 (9) | 0.102 (9) | 0.106 (7) | 0.049 (7) | 0.007 (6) | −0.035 (6) |
C3 | 0.129 (9) | 0.072 (7) | 0.124 (8) | −0.042 (7) | −0.056 (7) | 0.032 (6) |
C4 | 0.125 (9) | 0.081 (7) | 0.086 (6) | −0.036 (6) | −0.011 (6) | 0.027 (5) |
Cd1—N1 | 2.407 (6) | C11—C12 | 1.391 (10) |
Cd1—N2 | 2.331 (5) | C18—C17 | 1.344 (12) |
Cd1—N3 | 2.339 (4) | C12—C13 | 1.359 (12) |
Cd1—N4 | 2.399 (5) | C5—C4 | 1.381 (12) |
Cd1—I2 | 2.8352 (6) | C10—C9 | 1.397 (12) |
Cd1—I1 | 2.9368 (6) | C7—C8 | 1.362 (16) |
I2—Ag1 | 2.9058 (8) | C2—C3 | 1.325 (15) |
I3—Ag1 | 2.8036 (7) | C9—C8 | 1.358 (17) |
I3—Ag1i | 2.8155 (7) | C3—C4 | 1.353 (17) |
I1—Ag1 | 2.8784 (7) | C1—H1A | 0.930 |
Ag1—I3i | 2.8155 (7) | C2—H2A | 0.930 |
Ag1—Ag1i | 3.2260 (11) | C3—H3A | 0.930 |
N3—C20 | 1.332 (7) | C4—H4A | 0.930 |
N3—C16 | 1.341 (8) | C5—H5A | 0.930 |
N4—C11 | 1.317 (8) | C6—H6A | 0.930 |
N4—C15 | 1.337 (8) | C7—H7A | 0.930 |
N2—C10 | 1.328 (9) | C8—H8A | 0.930 |
N2—C6 | 1.341 (9) | C9—H9A | 0.930 |
N1—C1 | 1.316 (9) | C10—H10A | 0.930 |
N1—C5 | 1.332 (9) | C11—H11A | 0.930 |
C15—C14 | 1.376 (9) | C12—H12A | 0.930 |
C15—C20 | 1.489 (9) | C13—H13A | 0.930 |
C6—C7 | 1.365 (10) | C14—H14A | 0.930 |
C6—C1 | 1.503 (11) | C15—H15A | 0.930 |
C20—C19 | 1.412 (9) | C16—H16A | 0.930 |
C1—C2 | 1.400 (11) | C17—H17A | 0.930 |
C16—C17 | 1.369 (10) | C18—H18A | 0.930 |
C14—C13 | 1.374 (11) | C19—H19A | 0.930 |
C19—C18 | 1.364 (12) | C20—H20A | 0.930 |
N2—Cd1—N3 | 155.03 (18) | N1—C1—C6 | 116.4 (6) |
N2—Cd1—N4 | 90.75 (18) | C2—C1—C6 | 123.2 (7) |
N3—Cd1—N4 | 69.61 (17) | N3—C16—C17 | 121.4 (7) |
N2—Cd1—N1 | 69.7 (2) | C13—C14—C15 | 119.3 (7) |
N3—Cd1—N1 | 92.37 (19) | C18—C19—C20 | 118.0 (7) |
N4—Cd1—N1 | 84.32 (17) | N4—C11—C12 | 123.3 (8) |
N2—Cd1—I2 | 96.99 (13) | C17—C18—C19 | 120.4 (7) |
N3—Cd1—I2 | 101.70 (12) | C18—C17—C16 | 119.8 (8) |
N4—Cd1—I2 | 171.04 (13) | C13—C12—C11 | 117.7 (8) |
N1—Cd1—I2 | 94.10 (13) | N1—C5—C4 | 123.2 (10) |
N2—Cd1—I1 | 99.88 (16) | C12—C13—C14 | 119.6 (6) |
N3—Cd1—I1 | 94.44 (12) | N2—C10—C9 | 120.7 (10) |
N4—Cd1—I1 | 86.86 (12) | C8—C7—C6 | 117.7 (11) |
N1—Cd1—I1 | 166.23 (14) | C3—C2—C1 | 120.5 (9) |
I2—Cd1—I1 | 96.217 (17) | C8—C9—C10 | 117.8 (10) |
Cd1—I2—Ag1 | 81.934 (18) | C9—C8—C7 | 121.8 (10) |
Ag1—I3—Ag1i | 70.08 (2) | C2—C3—C4 | 119.9 (9) |
Ag1—I1—Cd1 | 80.672 (18) | C3—C4—C5 | 117.6 (11) |
I3—Ag1—I3i | 109.92 (2) | H2A—C2—C1 | 118.70 |
I3—Ag1—I1 | 109.69 (2) | H2A—C2—C3 | 120.25 |
I3i—Ag1—I1 | 116.74 (2) | H3A—C3—C2 | 118.67 |
I3—Ag1—I2 | 118.40 (2) | H3A—C3—C4 | 118.70 |
I3i—Ag1—I2 | 105.86 (2) | H4A—C4—C3 | 120.25 |
I1—Ag1—I2 | 95.96 (2) | H4A—C4—C5 | 120.22 |
I3—Ag1—Ag1i | 55.135 (19) | H5A—C5—C4 | 120.69 |
I3i—Ag1—Ag1i | 54.790 (19) | H5A—C5—N1 | 120.71 |
I1—Ag1—Ag1i | 133.27 (3) | H7A—C7—C6 | 118.22 |
I2—Ag1—Ag1i | 130.68 (3) | H7A—C7—C8 | 118.28 |
C20—N3—C16 | 119.5 (5) | H8A—C8—C7 | 118.38 |
C20—N3—Cd1 | 118.8 (4) | H8A—C8—C9 | 118.39 |
C16—N3—Cd1 | 121.8 (4) | H9A—C9—C8 | 120.51 |
C11—N4—C15 | 118.6 (6) | H9A—C9—C10 | 120.52 |
C11—N4—Cd1 | 124.2 (4) | H10A—C10—C9 | 120.59 |
C15—N4—Cd1 | 115.9 (4) | H10A—C10—N2 | 120.64 |
C10—N2—C6 | 120.0 (7) | H11A—C11—N4 | 120.53 |
C10—N2—Cd1 | 121.3 (6) | H11A—C11—C12 | 120.57 |
C6—N2—Cd1 | 118.7 (5) | H12A—C12—C11 | 118.34 |
C1—N1—C5 | 118.3 (7) | H12A—C12—C13 | 118.41 |
C1—N1—Cd1 | 117.6 (5) | H13A—C13—C12 | 118.67 |
C5—N1—Cd1 | 124.1 (5) | H13A—C13—C14 | 118.70 |
N4—C15—C14 | 121.4 (6) | H14A—C14—C13 | 120.25 |
N4—C15—C20 | 116.5 (5) | H14A—C14—C15 | 120.22 |
C14—C15—C20 | 122.1 (6) | H16A—C16—N3 | 120.69 |
N2—C6—C7 | 121.9 (9) | H16A—C16—C17 | 120.71 |
N2—C6—C1 | 117.5 (5) | H17A—C17—C16 | 118.22 |
C7—C6—C1 | 120.5 (9) | H17A—C17—C18 | 118.28 |
N3—C20—C19 | 120.9 (6) | H18A—C18—C17 | 118.38 |
N3—C20—C15 | 117.0 (5) | H18A—C18—C19 | 118.39 |
C19—C20—C15 | 122.1 (6) | H19A—C19—C18 | 120.51 |
N1—C1—C2 | 120.3 (8) | H19A—C19—C20 | 120.52 |
Symmetry code: (i) −x+2, −y, −z+1. |
Experimental details
Crystal data | |
Chemical formula | [Ag2Cd2I6(C10H8N2)4] |
Mr | 1826.68 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 293 |
a, b, c (Å) | 8.9170 (6), 21.5098 (15), 12.8527 (9) |
β (°) | 94.374 (4) |
V (Å3) | 2458.0 (3) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 5.44 |
Crystal size (mm) | 0.20 × 0.15 × 0.15 |
Data collection | |
Diffractometer | Bruker SMART APEXII CCD diffractometer |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 14678, 6188, 4890 |
Rint | 0.045 |
(sin θ/λ)max (Å−1) | 0.672 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.044, 0.121, 1.00 |
No. of reflections | 6188 |
No. of parameters | 263 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 1.19, −1.02 |
Computer programs: SMART, SHELXS97 (Sheldrick, 1997a), SHELXL97 (Sheldrick, 1997a), SHELXTL (Sheldrick, 1997b).
Cd1—N1 | 2.407 (6) | Cd1—I1 | 2.9368 (6) |
Cd1—N2 | 2.331 (5) | I2—Ag1 | 2.9058 (8) |
Cd1—N3 | 2.339 (4) | I3—Ag1 | 2.8036 (7) |
Cd1—N4 | 2.399 (5) | I1—Ag1 | 2.8784 (7) |
Cd1—I2 | 2.8352 (6) | Ag1—Ag1i | 3.2260 (11) |
N2—Cd1—N3 | 155.03 (18) | N4—Cd1—I1 | 86.86 (12) |
N2—Cd1—N4 | 90.75 (18) | I2—Cd1—I1 | 96.217 (17) |
N3—Cd1—N4 | 69.61 (17) | Ag1—I3—Ag1i | 70.08 (2) |
N2—Cd1—N1 | 69.7 (2) | I3—Ag1—I1 | 109.69 (2) |
N3—Cd1—N1 | 92.37 (19) | I3—Ag1—I2 | 118.40 (2) |
N4—Cd1—N1 | 84.32 (17) | I1—Ag1—I2 | 95.96 (2) |
N4—Cd1—I2 | 171.04 (13) |
Symmetry code: (i) −x+2, −y, −z+1. |
Divers and useful physcial properties as well as large structural varitey have prompted the recent surge in design and synthesis of new hybrid organic-inorganic materials.These materials have attracted much attention of chemists and physicists, not due to variety of intriguing structure topologies, but also for their potential application in catalysis, materials science, medicine, magntochemistry, and optical materials (Cheetham, 1994; Yaghi et al., 1998; Wu et al., 2003; Niu et al., 2004). Among the various families of hybrid functional materials, silver(I) halides occupy an important role (Li et al., 2006; Rutherford, 1998). Up to now the structure of silver(I) halides containing Ag2I4, Ag3I6, Ag4I6, and Ag4I8 anions exhibit isolated anions, one-dimensional infinite chains, two- and three-dimensional frameworks (Meyer, 1963; Estienne, 1986; Helgsson & Jagner, 1991; Jones, 1992). In this paper we report the synthesis and structure of a new one-dimensional organic-inorganic hybrid compound Ag2I6[Cd(2,2'-bipyridine)2]2.
The structure of the compound contains an one-dimensional Ag2I6 chain: the six iodide atoms acting as bridges between the silver atoms (Fig. 1). Ag atoms are in a tetraherdal arrangement where AgI4 tetrahedra share all corners with the neighbouring metal atoms (Figs.1 and 2). The Ag—I distances range from 2.8036 (7)Å to 2.9058 (8) Å, while the Ag—I—Ag angle is 70.08 (2)°,and the I—Ag—I angles range from 95.96 (2)° to 118.40 (2)° (Table 1). In Ag2I6 the Ag···Ag separation is 3.2260 (11) Å. Cd(II) reveals a distorted octahedral geometry with two 2,2'-bipyridine ligands and two iodide atoms (Fig. 1). The Cd—I distances range from 2.8352 (6)Å to 2.9368 (6) Å, whereas Cd—N are in the range from 2.331 (5)Å to 2.407 (6) Å. The N—Cd—N angles range from 69.61 (17)° to 155.03 (18)°, I—Cd—I is 96.217 (17)°, and the N—Cd—I angles are from 86.86 (12)° to 171.04 (13)° (Table 1). Ag2I6 links adjacent Cd centres into the chains.