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The title complex, [MnHg(SCN)4(CH4N2O)3]n, consists of slightly distorted octahedral MnN3O3 and tetrahedral HgS4 units. The MnII atom is coordinated by the O atoms of three urea molecules and by the N atoms of three SCN− ions; HgII is coordinated by four S atoms from SCN− ions. Each pair of MnII and HgII atoms is connected by an –SCN– bridge, forming infinite two-dimensional –Mn—NCS—Hg– networks.
Supporting information
CCDC reference: 180138
MnHg(SCN)4 was prepared by the reaction of MnX2, HgX2 (where
X = Cl, NO3 or CH3COO) and ASCN (where A = K, Na, or NH4) (molar
ratio 1:1:4) in water. The crystalline powders of MnHg(SCN)4 and urea were
dissolved into water according to the stoichiometric proportion. The mixture
was then left standing for several days, thereby crystals of (I) were
obtained.
The N7 and N8 atoms were disordered. The N7, N7', N8 and N8' atoms were refined
isotropically, and their site-occupation factors were 0.59, 0.41, 0.69 and
0.31, respectively. The positions of all H atoms were placed geometrically
(N—H = 0.86 Å) and refined using a riding model, with
Uiso=1.2Ueq(parent atom).
Data collection: XSCANS (Bruker, 1996); cell refinement: XSCANS (Bruker, 1996); data reduction: XSCANS (Bruker, 1996); program(s) used to solve structure: SHELXTL (Bruker, 1997); program(s) used to refine structure: SHELXL93 (Sheldrick, 1993); molecular graphics: SHELXTL (Bruker, 1997).
Crystal data top
C7H12HgMnN10O3S4 | Z = 2 |
Mr = 668.04 | F(000) = 634 |
Triclinic, P1 | Dx = 2.191 Mg m−3 |
a = 7.5210 (7) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 10.6669 (9) Å | Cell parameters from 53 reflections |
c = 13.3202 (9) Å | θ = 4.7–14.5° |
α = 80.185 (6)° | µ = 8.64 mm−1 |
β = 82.009 (7)° | T = 293 K |
γ = 75.147 (7)° | Prism, pale green |
V = 1012.69 (14) Å3 | 0.31 × 0.21 × 0.20 mm |
Data collection top
Bruker P4 diffractometer | 3229 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.017 |
Graphite monochromator | θmax = 25.0°, θmin = 2.0° |
θ/2θ scans | h = −8→1 |
Absorption correction: ψ scan XSCANS (Bruker,1996) | k = −12→12 |
Tmin = 0.125, Tmax = 0.179 | l = −15→15 |
4448 measured reflections | 3 standard reflections every 97 reflections |
3561 independent reflections | intensity decay: none |
Refinement top
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)] = 0.027 | H-atom parameters constrained |
wR(F2) = 0.065 | w = 1/[σ2(Fo2) + (0.0255P)2 + 2.0461P] where P = (Fo2 + 2Fc2)/3 |
S = 1.02 | (Δ/σ)max = −0.002 |
3558 reflections | Δρmax = 0.84 e Å−3 |
236 parameters | Δρmin = −0.81 e Å−3 |
0 restraints | Extinction correction: SHELXL, Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0064 (3) |
Crystal data top
C7H12HgMnN10O3S4 | γ = 75.147 (7)° |
Mr = 668.04 | V = 1012.69 (14) Å3 |
Triclinic, P1 | Z = 2 |
a = 7.5210 (7) Å | Mo Kα radiation |
b = 10.6669 (9) Å | µ = 8.64 mm−1 |
c = 13.3202 (9) Å | T = 293 K |
α = 80.185 (6)° | 0.31 × 0.21 × 0.20 mm |
β = 82.009 (7)° | |
Data collection top
Bruker P4 diffractometer | 3229 reflections with I > 2σ(I) |
Absorption correction: ψ scan XSCANS (Bruker,1996) | Rint = 0.017 |
Tmin = 0.125, Tmax = 0.179 | 3 standard reflections every 97 reflections |
4448 measured reflections | intensity decay: none |
3561 independent reflections | |
Refinement top
R[F2 > 2σ(F2)] = 0.027 | 0 restraints |
wR(F2) = 0.065 | H-atom parameters constrained |
S = 1.02 | Δρmax = 0.84 e Å−3 |
3558 reflections | Δρmin = −0.81 e Å−3 |
236 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. |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | Occ. (<1) |
Hg1 | 0.11801 (3) | 0.83307 (2) | 0.33629 (2) | 0.05191 (11) | |
Mn1 | −0.25073 (10) | 0.40068 (7) | 0.25381 (5) | 0.0377 (2) | |
S1 | 0.1281 (2) | 0.60520 (15) | 0.42110 (13) | 0.0633 (4) | |
S2 | 0.2927 (3) | 0.8242 (2) | 0.15528 (14) | 0.0843 (6) | |
S3 | 0.2131 (3) | 1.00831 (15) | 0.4057 (2) | 0.0757 (5) | |
S4 | −0.2341 (2) | 0.92646 (14) | 0.32078 (12) | 0.0537 (3) | |
C1 | 0.0023 (7) | 0.5626 (5) | 0.3463 (4) | 0.0426 (11) | |
C2 | −0.5556 (8) | 0.6837 (6) | 0.1825 (4) | 0.0477 (12) | |
C3 | 0.0579 (7) | 0.1353 (5) | 0.3532 (4) | 0.0466 (12) | |
C4 | −0.2257 (8) | 0.9276 (5) | 0.1956 (5) | 0.0546 (14) | |
C5 | −0.0190 (7) | 0.3072 (5) | 0.0498 (4) | 0.0415 (11) | |
C6 | −0.5371 (8) | 0.2842 (6) | 0.1620 (5) | 0.063 (2) | |
C7 | −0.4855 (6) | 0.3153 (5) | 0.4589 (4) | 0.0377 (10) | |
N1 | −0.0825 (6) | 0.5254 (4) | 0.2972 (3) | 0.0487 (10) | |
N2 | −0.4482 (7) | 0.5861 (5) | 0.1990 (4) | 0.0545 (11) | |
N3 | −0.0486 (7) | 0.2241 (4) | 0.3189 (4) | 0.0503 (11) | |
N4 | −0.2178 (9) | 0.9340 (6) | 0.1084 (5) | 0.077 (2) | |
N5 | 0.0874 (8) | 0.3334 (5) | −0.0354 (4) | 0.0654 (15) | |
H5A | 0.1088 (8) | 0.4101 (5) | −0.0522 (4) | 0.078* | |
H5B | 0.1350 (8) | 0.2737 (5) | −0.0739 (4) | 0.078* | |
N6 | −0.0369 (8) | 0.1857 (4) | 0.0764 (4) | 0.0616 (14) | |
H6A | −0.0975 (8) | 0.1643 (4) | 0.1337 (4) | 0.074* | |
H6B | 0.0120 (8) | 0.1279 (4) | 0.0365 (4) | 0.074* | |
N9 | −0.5002 (8) | 0.2071 (5) | 0.4287 (4) | 0.0602 (13) | |
H9A | −0.4580 (8) | 0.1910 (5) | 0.3677 (4) | 0.072* | |
H9B | −0.5521 (8) | 0.1527 (5) | 0.4701 (4) | 0.072* | |
N10 | −0.5469 (6) | 0.3337 (4) | 0.5555 (3) | 0.0498 (11) | |
H10A | −0.5354 (6) | 0.4017 (4) | 0.5781 (3) | 0.060* | |
H10B | −0.5980 (6) | 0.2775 (4) | 0.5951 (3) | 0.060* | |
O1 | −0.0878 (5) | 0.3948 (3) | 0.1055 (3) | 0.0483 (9) | |
O2 | −0.3973 (5) | 0.2729 (4) | 0.2029 (3) | 0.0511 (9) | |
O3 | −0.4110 (5) | 0.3965 (3) | 0.4008 (3) | 0.0462 (8) | |
N7 | −0.5441 (17) | 0.2077 (11) | 0.0933 (12) | 0.066 (4)* | 0.59 (3) |
H7A | −0.4480 (17) | 0.1484 (11) | 0.0768 (12) | 0.079* | 0.59 (3) |
H7B | −0.6446 (17) | 0.2180 (11) | 0.0657 (12) | 0.079* | 0.59 (3) |
N8 | −0.6875 (12) | 0.3780 (8) | 0.1862 (6) | 0.069 (3)* | 0.69 (2) |
H8A | −0.6836 (12) | 0.4282 (8) | 0.2296 (6) | 0.083* | 0.69 (2) |
H8B | −0.7875 (12) | 0.3877 (8) | 0.1583 (6) | 0.083* | 0.69 (2) |
N7' | −0.5834 (19) | 0.1797 (14) | 0.1369 (14) | 0.052 (4)* | 0.41 (3) |
H7'A | −0.5134 (19) | 0.1025 (14) | 0.1497 (14) | 0.062* | 0.41 (3) |
H7'B | −0.6829 (19) | 0.1906 (14) | 0.1082 (14) | 0.062* | 0.41 (3) |
N8' | −0.616 (4) | 0.409 (3) | 0.100 (3) | 0.135 (13)* | 0.31 (2) |
H8'A | −0.563 (4) | 0.474 (3) | 0.092 (3) | 0.162* | 0.31 (2) |
H8'B | −0.715 (4) | 0.418 (3) | 0.071 (3) | 0.162* | 0.31 (2) |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
Hg1 | 0.04664 (14) | 0.03664 (13) | 0.0745 (2) | −0.01145 (9) | −0.00442 (10) | −0.01239 (9) |
Mn1 | 0.0394 (4) | 0.0344 (4) | 0.0385 (4) | −0.0095 (3) | 0.0019 (3) | −0.0069 (3) |
S1 | 0.0744 (10) | 0.0502 (8) | 0.0743 (10) | −0.0304 (8) | −0.0330 (8) | 0.0108 (7) |
S2 | 0.0779 (12) | 0.0730 (11) | 0.0658 (10) | 0.0234 (9) | 0.0074 (9) | 0.0145 (8) |
S3 | 0.0701 (10) | 0.0381 (7) | 0.129 (2) | −0.0079 (7) | −0.0553 (11) | −0.0108 (8) |
S4 | 0.0410 (7) | 0.0533 (8) | 0.0657 (9) | −0.0089 (6) | 0.0015 (6) | −0.0142 (7) |
C1 | 0.041 (3) | 0.030 (2) | 0.055 (3) | −0.010 (2) | 0.001 (2) | −0.002 (2) |
C2 | 0.046 (3) | 0.054 (3) | 0.040 (3) | −0.010 (3) | 0.003 (2) | −0.006 (2) |
C3 | 0.045 (3) | 0.039 (3) | 0.060 (3) | −0.012 (2) | −0.009 (2) | −0.012 (2) |
C4 | 0.047 (3) | 0.036 (3) | 0.080 (4) | −0.004 (2) | −0.002 (3) | −0.019 (3) |
C5 | 0.045 (3) | 0.039 (3) | 0.042 (3) | −0.012 (2) | 0.000 (2) | −0.008 (2) |
C6 | 0.048 (3) | 0.056 (4) | 0.089 (5) | −0.004 (3) | −0.018 (3) | −0.026 (3) |
C7 | 0.035 (2) | 0.036 (2) | 0.043 (3) | −0.009 (2) | 0.001 (2) | −0.007 (2) |
N1 | 0.050 (3) | 0.043 (2) | 0.056 (3) | −0.015 (2) | −0.002 (2) | −0.011 (2) |
N2 | 0.051 (3) | 0.050 (3) | 0.055 (3) | −0.002 (2) | 0.003 (2) | −0.010 (2) |
N3 | 0.054 (3) | 0.037 (2) | 0.059 (3) | −0.008 (2) | −0.011 (2) | −0.005 (2) |
N4 | 0.086 (4) | 0.061 (3) | 0.079 (4) | 0.002 (3) | −0.007 (3) | −0.026 (3) |
N5 | 0.097 (4) | 0.044 (3) | 0.053 (3) | −0.022 (3) | 0.026 (3) | −0.018 (2) |
N6 | 0.087 (4) | 0.041 (2) | 0.056 (3) | −0.023 (2) | 0.021 (3) | −0.017 (2) |
N9 | 0.091 (4) | 0.049 (3) | 0.050 (3) | −0.037 (3) | 0.007 (3) | −0.010 (2) |
N10 | 0.064 (3) | 0.043 (2) | 0.045 (2) | −0.024 (2) | 0.013 (2) | −0.010 (2) |
O1 | 0.062 (2) | 0.039 (2) | 0.043 (2) | −0.017 (2) | 0.012 (2) | −0.0108 (15) |
O2 | 0.049 (2) | 0.053 (2) | 0.058 (2) | −0.017 (2) | −0.009 (2) | −0.014 (2) |
O3 | 0.057 (2) | 0.038 (2) | 0.045 (2) | −0.019 (2) | 0.009 (2) | −0.0090 (15) |
Geometric parameters (Å, º) top
Hg1—S1 | 2.4865 (14) | C6—N7 | 1.341 (12) |
Hg1—S3 | 2.514 (2) | C6—N8 | 1.346 (10) |
Hg1—S2 | 2.585 (2) | C6—N7' | 1.354 (14) |
Hg1—S4 | 2.6035 (15) | C6—N8' | 1.48 (3) |
Mn1—O3 | 2.152 (3) | C7—O3 | 1.250 (6) |
Mn1—O1 | 2.176 (3) | C7—N9 | 1.320 (6) |
Mn1—O2 | 2.197 (4) | C7—N10 | 1.335 (6) |
Mn1—N3 | 2.225 (5) | N5—H5A | 0.86 |
Mn1—N2 | 2.226 (5) | N5—H5B | 0.86 |
Mn1—N1 | 2.243 (5) | N6—H6A | 0.86 |
S1—C1 | 1.653 (6) | N6—H6B | 0.86 |
S2—C2i | 1.653 (6) | N9—H9A | 0.86 |
S3—C3ii | 1.667 (6) | N9—H9B | 0.86 |
S4—C4 | 1.658 (7) | N10—H10A | 0.86 |
C1—N1 | 1.152 (7) | N10—H10B | 0.86 |
C2—N2 | 1.151 (7) | N7—H7A | 0.86 |
C2—S2iii | 1.653 (6) | N7—H7B | 0.86 |
C3—N3 | 1.146 (7) | N8—H8A | 0.86 |
C3—S3iv | 1.667 (6) | N8—H8B | 0.86 |
C4—N4 | 1.146 (8) | N7'—H7'A | 0.86 |
C5—O1 | 1.254 (6) | N7'—H7'B | 0.86 |
C5—N6 | 1.321 (6) | N8'—H8'A | 0.86 |
C5—N5 | 1.327 (7) | N8'—H8'B | 0.86 |
C6—O2 | 1.220 (7) | | |
| | | |
S1—Hg1—S3 | 126.91 (6) | O2—C6—N8' | 119.5 (14) |
S1—Hg1—S2 | 108.63 (6) | N7'—C6—N8' | 113.6 (15) |
S3—Hg1—S2 | 105.24 (8) | O3—C7—N9 | 121.7 (4) |
S1—Hg1—S4 | 101.84 (5) | O3—C7—N10 | 120.4 (4) |
S3—Hg1—S4 | 103.95 (5) | N9—C7—N10 | 117.8 (4) |
S2—Hg1—S4 | 109.38 (6) | C1—N1—Mn1 | 159.1 (4) |
O3—Mn1—O1 | 177.20 (13) | C2—N2—Mn1 | 172.0 (4) |
O3—Mn1—O2 | 91.71 (13) | C3—N3—Mn1 | 178.2 (4) |
O1—Mn1—O2 | 86.18 (14) | C5—N5—H5A | 120.0 (3) |
O3—Mn1—N3 | 88.2 (2) | C5—N5—H5B | 120.0 (3) |
O1—Mn1—N3 | 89.9 (2) | H5A—N5—H5B | 120.0 |
O2—Mn1—N3 | 89.5 (2) | C5—N6—H6A | 120.0 (3) |
O3—Mn1—N2 | 89.3 (2) | C5—N6—H6B | 120.0 (3) |
O1—Mn1—N2 | 92.8 (2) | H6A—N6—H6B | 120.0 |
O2—Mn1—N2 | 94.8 (2) | C7—N9—H9A | 120.0 (3) |
N3—Mn1—N2 | 175.1 (2) | C7—N9—H9B | 120.0 (3) |
O3—Mn1—N1 | 92.27 (15) | H9A—N9—H9B | 120.0 |
O1—Mn1—N1 | 89.8 (2) | C7—N10—H10A | 120.0 (3) |
O2—Mn1—N1 | 175.6 (2) | C7—N10—H10B | 120.0 (3) |
N3—Mn1—N1 | 88.7 (2) | H10A—N10—H10B | 120.0 |
N2—Mn1—N1 | 87.2 (2) | C5—O1—Mn1 | 134.5 (3) |
C1—S1—Hg1 | 99.2 (2) | C6—O2—Mn1 | 138.0 (4) |
C2i—S2—Hg1 | 97.1 (2) | C7—O3—Mn1 | 135.7 (3) |
C3ii—S3—Hg1 | 97.0 (2) | C6—N7—H7A | 120.0 (5) |
C4—S4—Hg1 | 97.0 (2) | C6—N7—H7B | 120.0 (5) |
N1—C1—S1 | 175.9 (5) | H7A—N7—H7B | 120.0 |
N2—C2—S2iii | 178.3 (5) | C6—N8—H8A | 120.0 (4) |
N3—C3—S3iv | 178.4 (5) | C6—N8—H8B | 120.0 (5) |
N4—C4—S4 | 176.7 (6) | H8A—N8—H8B | 120.0 |
O1—C5—N6 | 122.3 (5) | C6—N7'—H7'A | 120.0 (6) |
O1—C5—N5 | 119.6 (5) | C6—N7'—H7'B | 120.0 (6) |
N6—C5—N5 | 117.9 (5) | H7'A—N7'—H7'B | 120.0 |
O2—C6—N7 | 122.0 (7) | C6—N8'—H8'A | 120.0 (13) |
O2—C6—N8 | 118.5 (6) | C6—N8'—H8'B | 120.0 (13) |
N7—C6—N8 | 119.5 (7) | H8'A—N8'—H8'B | 120.0 |
O2—C6—N7' | 122.0 (7) | | |
Symmetry codes: (i) x+1, y, z; (ii) x, y+1, z; (iii) x−1, y, z; (iv) x, y−1, z. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
N10—H10A···O3v | 0.86 | 2.15 | 2.964 (5) | 159 |
Symmetry code: (v) −x−1, −y+1, −z+1. |
Experimental details
Crystal data |
Chemical formula | C7H12HgMnN10O3S4 |
Mr | 668.04 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 293 |
a, b, c (Å) | 7.5210 (7), 10.6669 (9), 13.3202 (9) |
α, β, γ (°) | 80.185 (6), 82.009 (7), 75.147 (7) |
V (Å3) | 1012.69 (14) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 8.64 |
Crystal size (mm) | 0.31 × 0.21 × 0.20 |
|
Data collection |
Diffractometer | Bruker P4 diffractometer |
Absorption correction | ψ scan XSCANS (Bruker,1996) |
Tmin, Tmax | 0.125, 0.179 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4448, 3561, 3229 |
Rint | 0.017 |
(sin θ/λ)max (Å−1) | 0.595 |
|
Refinement |
R[F2 > 2σ(F2)], wR(F2), S | 0.027, 0.065, 1.02 |
No. of reflections | 3558 |
No. of parameters | 236 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.84, −0.81 |
Selected geometric parameters (Å, º) topHg1—S1 | 2.4865 (14) | S1—C1 | 1.653 (6) |
Hg1—S3 | 2.514 (2) | S2—C2i | 1.653 (6) |
Hg1—S2 | 2.585 (2) | S3—C3ii | 1.667 (6) |
Hg1—S4 | 2.6035 (15) | S4—C4 | 1.658 (7) |
Mn1—O3 | 2.152 (3) | C1—N1 | 1.152 (7) |
Mn1—O1 | 2.176 (3) | C2—N2 | 1.151 (7) |
Mn1—O2 | 2.197 (4) | C2—S2iii | 1.653 (6) |
Mn1—N3 | 2.225 (5) | C3—N3 | 1.146 (7) |
Mn1—N2 | 2.226 (5) | C3—S3iv | 1.667 (6) |
Mn1—N1 | 2.243 (5) | C4—N4 | 1.146 (8) |
| | | |
S1—Hg1—S3 | 126.91 (6) | O3—Mn1—N1 | 92.27 (15) |
S1—Hg1—S2 | 108.63 (6) | O1—Mn1—N1 | 89.8 (2) |
S3—Hg1—S2 | 105.24 (8) | O2—Mn1—N1 | 175.6 (2) |
S1—Hg1—S4 | 101.84 (5) | N3—Mn1—N1 | 88.7 (2) |
S3—Hg1—S4 | 103.95 (5) | N2—Mn1—N1 | 87.2 (2) |
S2—Hg1—S4 | 109.38 (6) | C1—S1—Hg1 | 99.2 (2) |
O3—Mn1—O1 | 177.20 (13) | C2i—S2—Hg1 | 97.1 (2) |
O3—Mn1—O2 | 91.71 (13) | C3ii—S3—Hg1 | 97.0 (2) |
O1—Mn1—O2 | 86.18 (14) | C4—S4—Hg1 | 97.0 (2) |
O3—Mn1—N3 | 88.2 (2) | N1—C1—S1 | 175.9 (5) |
O1—Mn1—N3 | 89.9 (2) | N2—C2—S2iii | 178.3 (5) |
O2—Mn1—N3 | 89.5 (2) | N3—C3—S3iv | 178.4 (5) |
O3—Mn1—N2 | 89.3 (2) | N4—C4—S4 | 176.7 (6) |
O1—Mn1—N2 | 92.8 (2) | C1—N1—Mn1 | 159.1 (4) |
O2—Mn1—N2 | 94.8 (2) | C2—N2—Mn1 | 172.0 (4) |
N3—Mn1—N2 | 175.1 (2) | C3—N3—Mn1 | 178.2 (4) |
Symmetry codes: (i) x+1, y, z; (ii) x, y+1, z; (iii) x−1, y, z; (iv) x, y−1, z. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
N10—H10A···O3v | 0.86 | 2.15 | 2.964 (5) | 158.5 |
Symmetry code: (v) −x−1, −y+1, −z+1. |
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Owing to the diverse applications of coordination compounds in chemistry-physics and technology, there exists continuing interest in the synthesis and characterization of compounds especially those of transition metals. In these studies, supramolecular architecture of multi-dimensional networks is one of the most attractive field from the technological point of view because these networks may have electronic, magnetic, optical or catalytic applications (Batten & Robson, 1998). For designing infinite inorganic and organic frameworks, various pseudohalide and pseudochalocogenide ions, such as CN-, OCN-, SCN-, SeCN-, CNO-, N3-, CN22-, SN22- and complementary ligands are used (Kitazawa et al., 1994; Cortes et al., 1997; Munno et al., 1997; Wang et al., 2000; Nandibewoor et al., 2000; Thirumaran & Ramalingam, 2000; Becker & Jansen, 2001). Due to their versatility in acting as monodentate, bidentate or bridging ligands, multi-dimensional framework structures linking alternately one metal atom M to another M' could be built by using pseudohalide or pseudochalocogenide ions.
Coordination chemistries of transition metals have been extensively studied from a chemical and structural point of view, mainly due to the capability of theirs to adopt different modes of coordination determined by considerations of size, as well as electrostatic and covalent bonding forces. The presence of pseudohalide and pseudochalocogenide ions introduces some additional degrees of freedom.
As a part of these investigations, the title compound (I), the urea adduct of manganese mercury thiocyanate, MnHg(SCN)4 (Yan et al., 1999) has been prepared, which has been introduced SCN-ions as bridging ligands [linking manganese(II) and mercury(II)] and urea as complementary ligands.
According to the hard and soft acid and bases (HSAB) concept (Pearson, 1966; Balarew & Duhlew, 1984), the harder metals show a pronounced affinity for coordination with harder ligands while softer metals prefer coordination with softer ligands. In this structure, each harder MnII is hexa-coordinated via harder 3 N(SCN)3O(urea) and in a slightly distorted octahedral geometry; and each softer HgII is tetracoordinated via softer 4S(SCN) and in a slightly distorted tetragonal geometry.
Each MnII is bound to three N atoms belonging to SCN groups and three O atoms to urea ligands. The resulting of hexa-coordinated MnII surrounding exhibits slight distortions from the ideal octahedron. The bond lengths of Mn—N [range 2.225 (5)–2.243 (5) Å] and those of Mn—O [range 2.152 (3)–2.197 (4) Å] are both much longer than the sum of Shannon's ionic radii, 2.13 and 2.02 Å (Shannon, 1976), respectively. This is probably because the assumed valences of the N and O atoms are not appropriated, for the charges on the SCN- ions and urea molecules are much delocalized. The bond angles for N—Mn—N, O—Mn—N and O—Mn—O (between adjacent atoms) range 87.2 (2)–88.7 (2), 88.2 (2)–94.8 (2) and 86.18 (14)–91.71 (13)° with the average values 87.95, 90.82 and 88.95°, respectively, which are somewhat different from the typical octahedral angles, 90°.
Each HgII, coordinated with four SCN S atoms, is in tetrahedral geometry. The tetrahedron is also slightly deformed. The Hg—S bond lengths are in the range 2.4865 (14)–2.6035 (15) Å, on the average 2.5473 Å, are much shorter than the sum of the Shannon ionic radii, 2.80 Å (Shannon, 1976), which all the more exhibits considerable delocaization of the charges on the SCN- ions. The bond angles for S—Hg—S [range 101.84 (5)–126.91 (6)°] are distinctly deviated from the typical tetrahedral angle.
Among the C—S—Hg angles, the bond angle of C1—S1—Hg1 is much larger than that of the rest. Although the bond angles of C2—N2—Mn1 [172.0 (4)°] and C3—N3—Mn1 [178.2 (4)°] are both close to 180.0°, however, that of C1—N1—Mn1 [159.1 (4)°] is obviously smaller and exhibit a significant bending. The SCN groups are quasi-linear [the N—C—S angles range 175.9 (5)–178.4 (5)°], which is the striking feature of these kinds of complexes: the –SCN– bridges, which connect bimetals forming infinite two- or three-dimensional networks (three-dimensional networks formed in this complex).