Poly[[bis­(μ-4,4′-bipyridyl-κ2N:N′)bis­(thio­cyanato-κN)manganese(II)] diethyl ether disolvate]

Wriedt, M.; Jess, I.; Näther, C.

doi:10.1107/S1600536810021665

metal-organic compounds

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ISSN: 2056-9890

Volume 66| Part 7| July 2010| Page m781

doi:10.1107/S1600536810021665

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Poly[[bis(μ-4,4′-bipyridyl-κ²N:N′)bis(thiocyanato-κN)manganese(II)] diethyl ether disolvate]

Mario Wriedt,^a ^* Inke Jess ^a and Christian Näther ^a

^aInstitut für Anorganische Chemie, Christian-Albrechts-Universität Kiel, Max-Eyth-Strasse 2, 24098 Kiel, Germany
^*Correspondence e-mail: mwriedt@ac.uni-kiel.de

(Received 25 May 2010; accepted 7 June 2010; online 16 June 2010)

In the title compound, {[Mn(NCS)₂(C₁₀H₈N₂)₂]·2C₄H₁₀O}_n, the Mn^II ion is coordinated by four N-bonded 4,4′-bipyridine (bipy) ligands and two N-bonded thiocyanate anions in a distorted octahedral coordination geometry. The asymmetric unit consists of one Mn^II ion and two bipy ligands each located on a twofold rotation axis, as well as one thiocyanate anion and one diethyl ether molecule in general positions. In the crystal structure, the metal centers with terminally bonded thicyanate anions are bridged by the bipy ligands into layers parallel to (001). The diethyl ether solvent molecules occupy the voids of the structure.

Related literature

For general background to thermal decomposition reactions as an alternative tool for the discovery and preparation of new ligand-deficient coordination polymers with defined magnetic properties, see: Wriedt & Näther (2009a ,b ); Wriedt et al. (2009a ,b ). For the isotypic cobalt(II) structure, see: Lu et al. (1997 ).

Experimental

Crystal data

[Mn(NCS)₂(C₁₀H₈N₂)₂]·2C₄H₁₀O
M_r = 631.71
Monoclinic, P 2/c
a = 11.702 (2) Å
b = 11.6391 (18) Å
c = 13.424 (2) Å
β = 106.75 (2)°
V = 1750.8 (5) Å³
Z = 2
Mo Kα radiation
μ = 0.53 mm⁻¹
T = 230 K
0.22 × 0.14 × 0.07 mm

Data collection

Stoe IPDS-1 diffractometer
Absorption correction: numerical (X-SHAPE and X-RED32; Stoe & Cie, 2002 ) T_min = 0.912, T_max = 0.968
11086 measured reflections
2954 independent reflections
2446 reflections with I > 2σ(I)
R_int = 0.134

Refinement

R[F² > 2σ(F²)] = 0.073
wR(F²) = 0.206
S = 1.07
2954 reflections
191 parameters
H-atom parameters constrained
Δρ_max = 0.72 e Å⁻³
Δρ_min = −1.37 e Å⁻³

Table 1
Selected bond lengths (Å)

Mn1—N21	2.181 (4)
Mn1—N12ⁱ	2.277 (4)
Mn1—N11	2.300 (4)
Mn1—N1	2.312 (3)
Symmetry code: (i) x, y-1, z.

Data collection: X-AREA (Stoe & Cie, 2002); cell refinement: X-AREA; data reduction: X-AREA; 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 I, global. DOI: 10.1107/S1600536810021665/hy2314sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536810021665/hy2314Isup2.hkl

checkCIF report

Comment top

Recently, we are interested in thermal decomposition reactions as an alternative tool for the discovering and preparation of new ligand-deficient coordination polymers with defined magnetic properties (Wriedt & Näther, 2009a,b; Wriedt et al., 2009a,b). In our ongoing investigation on the synthesis, structures and properties of such compounds we have reacted manganese(II) chloride, potassium thiocyanate and 4,4-bipyridine (bipy). In this reaction single crystals of the title compound were grown.

The title compound (Fig. 1) represents a two-dimensional layered coordination polymer, in which the Mn^II atom is coordinated by four bipy ligands and two thiocyanate anions in an octahedral coordination mode. The crystal structure is isotypic to its cobalt(II) analogue (Lu et al., 1997). In the crystal structure the metal atoms are bridged by the bipy ligands into layers with terminally N-bonded thicyanate anions. The layers are stacked perpendicular to the crystallographic c axis in order that the metal atoms in one layer sit above or below the squares formed by the metal atoms of the adjacent layers. By this arrangement voids are formed in which the diethyl ether molecules are located (Fig. 2). The MnN₆ octahedron is markedly distorted with four long Mn—N_bipy distances in the range of 2.277 (4) to 2.312 (4) Å and two short Mn—NCS distances of 2.181 (4) Å (Table 1). The angles arround the metal atoms range between 88.27 (8) to 91.73 (8) and 176.54 (16) to 180°. The pyridyl rings of the bipy ligands form dihedral angles of 51.2 (1) and 52.6 (1)°, respectively. The shortest intra- and interlayer Mn···Mn distances amount to 11.6391 (6) and 8.3198 (11) Å, respectively.

Related literature top

For general background to thermal decomposition reactions as an alternative tool for the discovery and preparation of new ligand-deficient coordination polymers with defined magnetic properties, see: Wriedt & Näther (2009a,b); Wriedt et al. (2009a,b). For the isotypic cobalt(II) structure, see: Lu et al. (1997).

Experimental top

MnCl₂ (117.0 mg, 0.93 mmol) and KNCS (180.8 mg, 1.86 mmol) obtained from Alfa Aesar were dissolved in a mixture of 10 ml water and 15 ml ethanol. This mixture was layered with a solution of 4,4-bipyridine (306.3 mg, 2 mmol) in 10 ml diethyl ether. After one day colourless block-shaped single crystals of the title compound were grown at the phase interface.

Computing details top

Data collection: X-AREA (Stoe & Cie, 2002); cell refinement: X-AREA (Stoe & Cie, 2002); data reduction: X-AREA (Stoe & Cie, 2002); 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. Structure of the title compound with displacement ellipsoids drawn at the 50% probability level. [Symmetry codes: (i) -x+1, y, -z+3/2; (ii) x, y-1, z; (iii) -x, y, -z+3/2.]
	Fig. 2. A single layer in the title compound with view approximately along the crystallographic c axis.

Poly[[bis(µ-4,4'-bipyridyl-κ²N:N')bis(thiocyanato- κN)manganese(II)] diethyl ether disolvate] top

Crystal data top

[Mn(NCS)₂(C₁₀H₈N₂)₂]·2C₄H₁₀O	F(000) = 662
M_r = 631.71	D_x = 1.198 Mg m⁻³
Monoclinic, P2/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2yc	Cell parameters from 11086 reflections
a = 11.702 (2) Å	θ = 2.4–25.0°
b = 11.6391 (18) Å	µ = 0.53 mm⁻¹
c = 13.424 (2) Å	T = 230 K
β = 106.75 (2)°	Block, colourless
V = 1750.8 (5) Å³	0.22 × 0.14 × 0.07 mm
Z = 2

Data collection top

Stoe IPDS-1 diffractometer	2954 independent reflections
Radiation source: fine-focus sealed tube	2446 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.134
ω scans	θ_max = 25.0°, θ_min = 2.4°
Absorption correction: numerical (X-SHAPE and X-RED32; Stoe & Cie, 2002)	h = −13→13
T_min = 0.912, T_max = 0.968	k = −13→13
11086 measured reflections	l = −15→15

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)] = 0.073	H-atom parameters constrained
wR(F²) = 0.206	w = 1/[σ²(F_o²) + (0.1115P)² + 1.3719P] where P = (F_o² + 2F_c²)/3
S = 1.07	(Δ/σ)_max < 0.001
2954 reflections	Δρ_max = 0.72 e Å⁻³
191 parameters	Δρ_min = −1.37 e Å⁻³
0 restraints	Extinction correction: SHELXL97 (Sheldrick, 2008), Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.034 (7)

Crystal data top

[Mn(NCS)₂(C₁₀H₈N₂)₂]·2C₄H₁₀O	V = 1750.8 (5) Å³
M_r = 631.71	Z = 2
Monoclinic, P2/c	Mo Kα radiation
a = 11.702 (2) Å	µ = 0.53 mm⁻¹
b = 11.6391 (18) Å	T = 230 K
c = 13.424 (2) Å	0.22 × 0.14 × 0.07 mm
β = 106.75 (2)°

Data collection top

Stoe IPDS-1 diffractometer	2954 independent reflections
Absorption correction: numerical (X-SHAPE and X-RED32; Stoe & Cie, 2002)	2446 reflections with I > 2σ(I)
T_min = 0.912, T_max = 0.968	R_int = 0.134
11086 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.073	0 restraints
wR(F²) = 0.206	H-atom parameters constrained
S = 1.07	Δρ_max = 0.72 e Å⁻³
2954 reflections	Δρ_min = −1.37 e Å⁻³
191 parameters

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
Mn1	0.5000	0.71119 (6)	0.7500	0.0284 (3)
N1	0.3018 (2)	0.7070 (3)	0.7479 (3)	0.0385 (8)
C1	0.2710 (3)	0.6632 (5)	0.8264 (4)	0.0557 (13)
H1	0.3317	0.6340	0.8829	0.067*
C2	0.1544 (4)	0.6575 (5)	0.8310 (4)	0.0617 (15)
H2	0.1373	0.6249	0.8892	0.074*
C3	0.0633 (3)	0.7003 (4)	0.7491 (4)	0.0408 (10)
C4	0.0940 (3)	0.7447 (5)	0.6646 (4)	0.0577 (13)
H4	0.0352	0.7725	0.6061	0.069*
C5	0.2141 (3)	0.7470 (5)	0.6684 (4)	0.0559 (13)
H5	0.2346	0.7788	0.6115	0.067*
N11	0.5000	0.9088 (4)	0.7500	0.0367 (11)
N12	0.5000	1.5156 (3)	0.7500	0.0354 (11)
C11	0.4781 (4)	0.9689 (3)	0.8272 (4)	0.0448 (10)
H11	0.4624	0.9285	0.8824	0.054*
C12	0.4775 (4)	1.0865 (4)	0.8300 (4)	0.0498 (11)
H12	0.4619	1.1249	0.8862	0.060*
C13	0.5000	1.1484 (4)	0.7500	0.0384 (13)
C16	0.4344 (4)	1.4556 (4)	0.6684 (4)	0.0488 (11)
H16	0.3880	1.4963	0.6104	0.059*
C15	0.4314 (4)	1.3368 (4)	0.6652 (4)	0.0509 (11)
H17	0.3837	1.2982	0.6063	0.061*
C14	0.5000	1.2758 (4)	0.7500	0.0390 (13)
N21	0.5534 (3)	0.7169 (3)	0.9196 (3)	0.0386 (8)
C21	0.6253 (3)	0.6927 (3)	0.9963 (4)	0.0412 (10)
S21	0.72754 (14)	0.65840 (19)	1.10210 (13)	0.0900 (6)
C31	0.0822 (10)	0.3656 (13)	0.6206 (10)	0.170 (6)
H31A	0.1479	0.4018	0.6020	0.255*
H31B	0.0756	0.3981	0.6853	0.255*
H31C	0.0086	0.3787	0.5659	0.255*
C32	0.1059 (12)	0.2324 (15)	0.6347 (9)	0.172 (6)
H32A	0.1679	0.2177	0.7002	0.206*
H32B	0.0329	0.1930	0.6375	0.206*
O31	0.1431 (5)	0.1896 (8)	0.5502 (5)	0.138 (3)
C33	0.1686 (9)	0.0670 (10)	0.5534 (11)	0.146 (5)
H33A	0.0974	0.0238	0.5554	0.175*
H33B	0.2328	0.0489	0.6166	0.175*
C34	0.2049 (11)	0.0329 (12)	0.4606 (12)	0.167 (5)
H34A	0.1368	0.0383	0.3991	0.251*
H34B	0.2341	−0.0456	0.4688	0.251*
H34C	0.2676	0.0837	0.4530	0.251*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Mn1	0.0147 (4)	0.0265 (5)	0.0448 (6)	0.000	0.0100 (3)	0.000
N1	0.0135 (13)	0.0482 (19)	0.057 (2)	0.0019 (12)	0.0146 (14)	0.0072 (15)
C1	0.0196 (17)	0.087 (3)	0.060 (3)	0.0062 (19)	0.0109 (18)	0.025 (3)
C2	0.0233 (18)	0.101 (4)	0.064 (3)	0.005 (2)	0.0176 (19)	0.032 (3)
C3	0.0130 (17)	0.060 (2)	0.051 (3)	0.0018 (15)	0.0119 (15)	0.0015 (19)
C4	0.0209 (17)	0.103 (4)	0.050 (3)	0.012 (2)	0.0110 (17)	0.011 (3)
C5	0.0220 (18)	0.095 (4)	0.054 (3)	0.011 (2)	0.0174 (18)	0.019 (3)
N11	0.034 (2)	0.026 (2)	0.054 (3)	0.000	0.018 (2)	0.000
N12	0.0246 (19)	0.025 (2)	0.055 (3)	0.000	0.0101 (19)	0.000
C11	0.057 (2)	0.032 (2)	0.055 (3)	0.0032 (18)	0.030 (2)	0.0031 (18)
C12	0.065 (3)	0.036 (2)	0.058 (3)	0.004 (2)	0.032 (2)	−0.0027 (19)
C13	0.034 (2)	0.028 (3)	0.054 (4)	0.000	0.013 (2)	0.000
C16	0.050 (2)	0.032 (2)	0.055 (3)	−0.0014 (18)	0.0004 (19)	0.0048 (18)
C15	0.056 (2)	0.034 (2)	0.054 (3)	−0.0069 (19)	0.002 (2)	−0.0031 (19)
C14	0.036 (3)	0.028 (3)	0.056 (4)	0.000	0.018 (3)	0.000
N21	0.0276 (15)	0.0389 (18)	0.049 (2)	0.0025 (12)	0.0111 (15)	0.0026 (14)
C21	0.034 (2)	0.044 (2)	0.049 (3)	0.0014 (16)	0.0167 (19)	−0.0025 (18)
S21	0.0624 (9)	0.1362 (16)	0.0578 (12)	0.0265 (9)	−0.0047 (7)	0.0143 (9)
C31	0.111 (8)	0.246 (16)	0.144 (11)	0.028 (9)	0.022 (7)	−0.056 (11)
C32	0.136 (9)	0.308 (19)	0.079 (8)	−0.067 (11)	0.041 (7)	−0.028 (10)
O31	0.078 (3)	0.235 (9)	0.093 (5)	−0.005 (4)	0.010 (3)	0.028 (5)
C33	0.089 (6)	0.131 (8)	0.204 (14)	0.015 (6)	0.020 (7)	0.061 (8)
C34	0.134 (9)	0.179 (11)	0.198 (13)	0.057 (8)	0.062 (9)	0.020 (10)

Geometric parameters (Å, º) top

Mn1—N21	2.181 (4)	C13—C12ⁱⁱⁱ	1.380 (5)
Mn1—N12ⁱ	2.277 (4)	C13—C14	1.483 (7)
Mn1—N11	2.300 (4)	C16—C15	1.383 (6)
Mn1—N1	2.312 (3)	C16—H16	0.9400
N1—C1	1.311 (6)	C15—C14	1.385 (5)
N1—C5	1.333 (6)	C15—H17	0.9400
C1—C2	1.385 (5)	C14—C15ⁱⁱⁱ	1.385 (5)
C1—H1	0.9400	N21—C21	1.161 (6)
C2—C3	1.386 (6)	C21—S21	1.621 (5)
C2—H2	0.9400	C31—C32	1.577 (18)
C3—C4	1.384 (7)	C31—H31A	0.9700
C3—C3ⁱⁱ	1.488 (6)	C31—H31B	0.9700
C4—C5	1.392 (5)	C31—H31C	0.9700
C4—H4	0.9400	C32—O31	1.418 (13)
C5—H5	0.9400	C32—H32A	0.9800
N11—C11	1.334 (5)	C32—H32B	0.9800
N11—C11ⁱⁱⁱ	1.334 (5)	O31—C33	1.455 (12)
N12—C16	1.338 (5)	C33—C34	1.482 (16)
N12—C16ⁱⁱⁱ	1.338 (5)	C33—H33A	0.9800
N12—Mn1^iv	2.277 (4)	C33—H33B	0.9800
C11—C12	1.370 (6)	C34—H34A	0.9700
C11—H11	0.9400	C34—H34B	0.9700
C12—C13	1.380 (5)	C34—H34C	0.9700
C12—H12	0.9400

N21—Mn1—N21ⁱⁱⁱ	176.54 (16)	C11—C12—C13	119.8 (4)
N21—Mn1—N12ⁱ	91.73 (8)	C11—C12—H12	120.1
N21ⁱⁱⁱ—Mn1—N12ⁱ	91.73 (8)	C13—C12—H12	120.1
N21—Mn1—N11	88.27 (8)	C12—C13—C12ⁱⁱⁱ	117.0 (5)
N21ⁱⁱⁱ—Mn1—N11	88.27 (8)	C12—C13—C14	121.5 (3)
N12ⁱ—Mn1—N11	180.0	C12ⁱⁱⁱ—C13—C14	121.5 (3)
N21—Mn1—N1	89.88 (12)	N12—C16—C15	123.4 (4)
N21ⁱⁱⁱ—Mn1—N1	90.19 (12)	N12—C16—H16	118.3
N12ⁱ—Mn1—N1	88.79 (8)	C15—C16—H16	118.3
N11—Mn1—N1	91.21 (8)	C16—C15—C14	118.9 (4)
N21—Mn1—N1ⁱⁱⁱ	90.19 (12)	C16—C15—H17	120.6
N21ⁱⁱⁱ—Mn1—N1ⁱⁱⁱ	89.88 (12)	C14—C15—H17	120.6
N12ⁱ—Mn1—N1ⁱⁱⁱ	88.79 (8)	C15ⁱⁱⁱ—C14—C15	118.3 (5)
N11—Mn1—N1ⁱⁱⁱ	91.21 (8)	C15ⁱⁱⁱ—C14—C13	120.8 (3)
N1—Mn1—N1ⁱⁱⁱ	177.58 (16)	C15—C14—C13	120.8 (3)
C1—N1—C5	116.9 (3)	C21—N21—Mn1	146.6 (3)
C1—N1—Mn1	120.3 (3)	N21—C21—S21	178.9 (4)
C5—N1—Mn1	122.7 (3)	C32—C31—H31A	109.5
N1—C1—C2	123.8 (4)	C32—C31—H31B	109.5
N1—C1—H1	118.1	H31A—C31—H31B	109.5
C2—C1—H1	118.1	C32—C31—H31C	109.5
C1—C2—C3	119.4 (4)	H31A—C31—H31C	109.5
C1—C2—H2	120.3	H31B—C31—H31C	109.5
C3—C2—H2	120.3	O31—C32—C31	109.5 (10)
C4—C3—C2	117.5 (3)	O31—C32—H32A	109.8
C4—C3—C3ⁱⁱ	120.5 (4)	C31—C32—H32A	109.8
C2—C3—C3ⁱⁱ	122.0 (5)	O31—C32—H32B	109.8
C3—C4—C5	118.4 (4)	C31—C32—H32B	109.8
C3—C4—H4	120.8	H32A—C32—H32B	108.2
C5—C4—H4	120.8	C32—O31—C33	115.3 (10)
N1—C5—C4	124.0 (4)	O31—C33—C34	110.1 (10)
N1—C5—H5	118.0	O31—C33—H33A	109.6
C4—C5—H5	118.0	C34—C33—H33A	109.6
C11—N11—C11ⁱⁱⁱ	116.8 (5)	O31—C33—H33B	109.6
C11—N11—Mn1	121.6 (2)	C34—C33—H33B	109.6
C11ⁱⁱⁱ—N11—Mn1	121.6 (2)	H33A—C33—H33B	108.2
C16—N12—C16ⁱⁱⁱ	117.1 (5)	C33—C34—H34A	109.5
C16—N12—Mn1^iv	121.4 (2)	C33—C34—H34B	109.5
C16ⁱⁱⁱ—N12—Mn1^iv	121.4 (2)	H34A—C34—H34B	109.5
N11—C11—C12	123.3 (4)	C33—C34—H34C	109.5
N11—C11—H11	118.4	H34A—C34—H34C	109.5
C12—C11—H11	118.4	H34B—C34—H34C	109.5

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

Experimental details

Crystal data
Chemical formula	[Mn(NCS)₂(C₁₀H₈N₂)₂]·2C₄H₁₀O
M_r	631.71
Crystal system, space group	Monoclinic, P2/c
Temperature (K)	230
a, b, c (Å)	11.702 (2), 11.6391 (18), 13.424 (2)
β (°)	106.75 (2)
V (Å³)	1750.8 (5)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	0.53
Crystal size (mm)	0.22 × 0.14 × 0.07

Data collection
Diffractometer	Stoe IPDS1 diffractometer
Absorption correction	Numerical (X-SHAPE and X-RED32; Stoe & Cie, 2002)
T_min, T_max	0.912, 0.968
No. of measured, independent and observed [I > 2σ(I)] reflections	11086, 2954, 2446
R_int	0.134
(sin θ/λ)_max (Å⁻¹)	0.595

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.073, 0.206, 1.07
No. of reflections	2954
No. of parameters	191
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.72, −1.37

Computer programs: X-AREA (Stoe & Cie, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Selected bond lengths (Å) top

Mn1—N21	2.181 (4)	Mn1—N11	2.300 (4)
Mn1—N12ⁱ	2.277 (4)	Mn1—N1	2.312 (3)

Symmetry code: (i) x, y−1, z.

Acknowledgements

MW thanks the Stiftung Stipendien-Fonds des Verbandes der Chemischen Industrie and the Studienstiftung des deutschen Volkes for a PhD scholarship. We gratefully acknowledge financial support by the State of Schleswig-Holstein and the Deutsche Forschungsgemeinschaft (Project 720/3-1). We thank Professor Dr Wolfgang Bensch for the opportunity to use his experimental facilities.

References

Lu, J., Paliwala, T., Lim, S. C., Yu, C., Niu, T. & Jacobson, A. J. (1997). Inorg. Chem. 36, 923–929. CSD CrossRef CAS Web of Science Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Stoe & Cie (2002). X-AREA, X-RED32 and X-SHAPE. Stoe & Cie, Darmstadt, Germany. Google Scholar
Wriedt, M. & Näther, C. (2009a). Dalton Trans. pp. 10192–10198. Web of Science CSD CrossRef Google Scholar
Wriedt, M. & Näther, C. (2009b). Z. Anorg. Allg. Chem. 636, 569–575. Web of Science CSD CrossRef Google Scholar
Wriedt, M., Sellmer, S. & Näther, C. (2009a). Dalton Trans. pp. 7975–7984. Web of Science CSD CrossRef Google Scholar
Wriedt, M., Sellmer, S. & Näther, C. (2009b). Inorg. Chem. 48, 6896–6903. Web of Science CSD CrossRef CAS PubMed Google Scholar

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