Home Crystal structure of chlorido-(η5-pentamethylcyclopentadienyl)-((bis-pyrazol-1-yl)methane-κ2N,N′) rhodium(III) hexafluorophosphate. (C17H23ClN4RhF6P)
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Crystal structure of chlorido-(η5-pentamethylcyclopentadienyl)-((bis-pyrazol-1-yl)methane-κ2N,N′) rhodium(III) hexafluorophosphate. (C17H23ClN4RhF6P)

  • Joel M. Gichumbi , Sizwe J. Zamisa ORCID logo EMAIL logo and Holger B. Friedrich
Published/Copyright: November 13, 2019

Abstract

C17H23ClN4RhF6P, monoclinic, P21/c (no. 14), a = 10.6954(2) Å, b = 15.3868(3) Å, c = 12.6130(2) Å, β = 90.5590(10)°, V = 2075.60(7) Å3, Z = 4, Rgt(F) = 0.0296, wRref(F2) = 0.0727, T = 100(2) K.

CCDC no.: 1959882

The asymmetric unit of the salt title structure is shown in the figure (hydrogen atoms are omitted for clarity). Table 1 contains crystallographic data and Table 2 contains the list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal:Orange block
Size:0.35 × 0.31 × 0.23 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:1.09 mm−1
Diffractometer, scan mode:Bruker APEX-II, φ and ω
θmax, completeness:28.3°, >99%
N(hkl)measured, N(hkl)unique, Rint:31369, 5166, 0.017
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 4994
N(param)refined:276
Programs:Bruker [1], SHELX [2], [3], Mercury [4]
Table 2:

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

AtomxyzUiso*/Ueq
Rh10.69970(2)0.11853(2)0.33986(2)0.01016(6)
Cl10.67376(5)0.10711(4)0.52789(4)0.01562(10)
N10.70574(17)−0.01726(12)0.33402(14)0.0138(4)
N20.80103(18)−0.06209(12)0.28963(15)0.0148(4)
N30.96207(17)0.03978(12)0.32904(15)0.0141(3)
N40.89583(17)0.10842(12)0.36637(15)0.0135(3)
C10.6225(2)−0.07659(15)0.36404(18)0.0177(4)
H10.5459−0.06410.39830.021*
C20.6641(2)−0.15980(16)0.33783(19)0.0202(5)
H20.6222−0.21330.34990.024*
C30.7783(2)−0.14813(15)0.29097(18)0.0187(4)
H30.8313−0.19250.26450.022*
C40.9074(2)−0.01508(15)0.24775(18)0.0158(4)
H4A0.9708−0.05690.22230.019*
H4B0.88010.02110.18690.019*
C51.0774(2)0.03702(16)0.37305(19)0.0178(4)
H51.1401−0.00520.35940.021*
C61.0876(2)0.10634(16)0.44118(19)0.0184(4)
H61.15800.12210.48350.022*
C70.9719(2)0.14879(15)0.43480(18)0.0164(4)
H70.95050.19940.47380.020*
C80.5812(2)0.12664(14)0.20087(17)0.0125(4)
C90.6921(2)0.17742(14)0.18605(17)0.0133(4)
C100.6934(2)0.24515(14)0.26632(17)0.0151(4)
C110.5842(2)0.23564(14)0.32890(17)0.0150(4)
C120.5168(2)0.15966(14)0.29214(17)0.0134(4)
C130.5399(2)0.05056(15)0.13573(18)0.0170(4)
H13A0.61290.02350.10280.026*
H13B0.48160.07020.08030.026*
H13C0.49830.00810.18130.026*
C140.7856(2)0.16944(16)0.09947(18)0.0181(4)
H14A0.87010.17460.12940.027*
H14B0.77170.21580.04730.027*
H14C0.77620.11280.06480.027*
C150.7914(2)0.31409(16)0.2772(2)0.0224(5)
H15A0.79620.33350.35110.034*
H15B0.76970.36340.23140.034*
H15C0.87260.29040.25610.034*
C160.5413(2)0.29392(16)0.41568(19)0.0214(5)
H16A0.53490.26060.48160.032*
H16B0.45930.31810.39700.032*
H16C0.60150.34130.42550.032*
C170.3963(2)0.12866(17)0.33710(19)0.0190(4)
H17A0.32690.16160.30550.029*
H17B0.39720.13730.41410.029*
H17C0.38560.06670.32130.029*
P10.84478(6)−0.13070(4)−0.03400(5)0.02066(13)
F10.72533(18)−0.13738(13)−0.10906(16)0.0413(5)
F20.91255(16)−0.20669(13)−0.10006(16)0.0412(5)
F30.7831(2)−0.20471(13)0.03929(17)0.0485(5)
F40.96244(18)−0.12937(15)0.04689(18)0.0502(6)
F50.77755(16)−0.05845(11)0.03655(14)0.0324(4)
F60.9090(3)−0.06062(15)−0.10376(19)0.0627(7)

Source of material

The title compound was synthesized using a mixture of the rhodium dimer pentamethylcyclopentadienyl rhodium(III) dichloride (0.055 mmol), bis(pyrazol-1-yl)methane (0.110 mmol) and NH4PF6 (0.110 mmol) which were stirred in methanol (10 mL) for six hours, where upon the orange yellow product separated out. The product was filtered, washed with diethyl ether and dried under vacuum. X-ray quality, orange block crystals were grown by vapour diffusion of diethyl ether into an acetone solution. m.p = >300 °C (decomposition); IRv(cm−1): 1519, 1429, 1401 (C=N), 832 (PF6); 1H NMR (400 MHz, d6-DMSO): δ(ppm) = 8.23 (d, 2H, J = 2.40 Hz, Pyrazole), 7.90 (s, 2H, Pyrazole), 7.09 (s, 1H, Pyrazole), 7.05 (s, 1H, Pyrazole), 6.63 (t, 2H, J = 2.12 Hz, –CH2), 13C NMR (400 MHz, d6-DMSO): δ(ppm) = 146.39, 145.27, 135.47, 108.81, 106.69, 97.26, 9.24.

Experimental details

The structure was solved by the direct method using the SHELXS [2] program and refined. The visual crystal structure information was performed using Mercury [4] system software. All C—Haromatic, C—Hmethyl and C—Hmethylene bond distances were restrained to 0.95 Å, 0.98 Å and 0.99 Å with Uiso(Haromatic and Hmethylene) = 1.2Ueq and Uiso(Hmethyl) = 1.5Ueq of parent atom, respectively. Some larger electron density peaks are located near the PF6 anion. These peaks may be the result of a minor disorder of this anion.

Comment

The pyrazole nucleus has been widely used as core motif for a large number of compounds with various applications and especially in coordination chemistry [5], [6]. Bis(pyrazolyl)alkanes are one of the most fascinating family of stable and flexible ligands and they are isoelectronic and isosteric with the well-known bis(pyrazolyl)borates. The coordinating properties of bis(pyrazol-1-yl)alkanes can be varied over wide range by introduction of various substituents into the pyrazole rings which are able to modify steric and electronic properties [7]. The bis(pyrazol-1-yl)alkanes are neutral ligands containing two pyrazole cycles linked by an aliphatic spacer and are related in concept to the heteroscorpionate ligands. The coordination properties of bis(pyrazol-1-yl)alkanes may be varied in wide range by introducing substituents into the pyrazole rings. Generally, two major coordination modes can be expected for bis(pyrazol-1-yl)alkanes, namely bidentate chelating and bidentate bridging. Bis(pyrazol1-yl)methanes and 1,2-bis (pyrazol-1-yl)ethanes usually act as bidentate chelating ligands forming boat-shaped six- and seven-membered rings, respectively. 1,3-Bis(pyrazol-1-yl)propane forms eight-membered metallocycles or acts as a bidentate bridging ligand, whereas bis(pyrazol-1-yl)alkanes with four and more methylene groups in the spacer coordinate in a bridging mode to give coordination compounds of intriguing architectures and topologies [8], [9], [10]. We have prepared the title compound as part of our ongoing studies of Rh complexes with bidentate ligands [11], [12].

The asymmetric unit of the title compound consists of an cationic Rh(III) complex with a PF6 anion. The Rh complex exists in the piano-stool conformation with a six-membered metallocycle (Rh1–N1–N2–C4–N3–N4) formed by coordination of the bidentate ligand. Furthermore, the metallocycle adopts a distorted boat conformation with a dihedral angle of 27.4(1)° between the N1–N2–N3–N4 and N1–Rh1–N4 planes. Upon coordination of the ligand, the dihedral angle between the pyrazolyl rings significantly decreased from 72.8(2)–73.06(9)° (observed in the free ligand [13], [14]) to 56.85(9)°. All bond distances and angles were found to be in agreement with closely related complexes reported in the literature [15], [16], [17]. Intermolecular, very weak π⋯π interactions between pyrazolyl rings N3—N4—C5—C6—C7 of neighbouring molecules were observed in the crystal packing of the title compound (π⋯π = 3.899(1) Å; symmetry code: 2 − x, −y, 1 − z). C—H⋯π intermolecular interactions were also observed between the H6 atom and the center of gravity of the N1—N2—C1—C2—C3 ring (H6⋯π = 2.82 Å; C6⋯π = 3.638(2) Å; C6—H6⋯π = 145°; symmetry code: 2 − x, −y, 1 − z).

Acknowledgements

We wish to extend our sincere thanks to the NRF, THRIP (Grant no. Tp 1208035643) and UKZN (URF) for their financial support. Joel Gichumbi thanks Chuka University for its support.

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Received: 2019-09-15
Accepted: 2019-10-17
Published Online: 2019-11-13
Published in Print: 2020-02-25

©2019 Joel M. Gichumbi et al., published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 Public License.

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  54. The crystal structure of 3-carboxy-5-methylpyridin-1-ium-2-carboxylate, C8H7NO4
  55. Crystal structure of bis(3-methoxy-N-(1-(pyridin-2-yl)ethylidene)benzohydrazonato κ3O,N,N′)zinc(II), C30H28N6O4Zn
  56. Crystal structure of dichlorido-(4,4′-dichloro-2,2′-bipyridine-κ2N,N′)platinum(II) — acetone (1/1), C13H12Cl4N2PtO
  57. Crystal structure of diethyl 6,12-bis(4-fluorophenyl)-2,10-dimethoxy-3,9-diphenyl-3,9-diazatetracyclo[6.4.0.02,7.04,11]dodecane-1,5-dicarboxylate, C42H42F2N2O6
  58. Synthesis and crystal structure of (1E,3E)-2-hydroxy-5-methylisophthalaldehyde O,O-di(2-((((E)-(2-hydroxynaphthalen-1-yl)methylene)amino)oxy)ethyl) dioxime, C35H32N4O7
  59. The crystal structure of 2-phenyl-4,6-bis(prop-2-yn-1-yloxy)-1,3,5-triazine, C15H11N3O2
  60. Crystal structure of 7-(2-{4-[(4-bromophenyl)methyl]piperazin-1-yl}ethoxy)-2H-chromen-2-one, C22H23BrN2O3
  61. Crystal structure of bis-[N-(3-ethyl-1-pyrazin-2-yl-ethylidene)-3-bromo-benzoic acid-hydrazonato-κ3O,N,N′)]-cadmium(II), C30H28N8O2Br2Cd
  62. Crystal structure of 6-(4-fluorophenyl)-4-methoxy-2H-pyran-2-one, C12H9FO3
  63. Crystal structure of 3-methyl-3-(2,4,5-trimethyl-3,6-dioxocyclohexa-1,4-dien-1-yl)butanoic acid, C14H18O4
  64. The crystal structure of 3-bromo-6-methoxy-2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine, C13H19BBrNO3
  65. The crystal structure of 6-methyl-3,20-dioxo-19-norpregna-4,6-dien-17-yl acetate–2,4-dihydroxybenzoic acid (1/1), C30H36O8
  66. The crystal structure of (5-chloro-2-hydroxy-N-(4-methoxy-2-oxidobenzylidene)benzohydrazonato-κ3N,O,O′)-(pyridine-κ1N)copper(II), C20H16ClCuN3O4
  67. Crystal structure of (E)-2-cyano-N′-(1-(3-ethylpyrazin-2-yl)ethylidene)acetohydrazide, C11H3N5O
  68. Crystal structure of (2,7-dihexyl-9,9-dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphane), C51H56OP2
  69. Crystal structure of 5-((bis(pyridin-2-ylmethyl)amino)methyl)quinolin-8-ol, C22H20N4O
  70. Crystal structure of 3-(2-(5-(4-fluorophenyl)-3-(4-methylphenyl)-4,5-dihydro-1H-pyrazol-1-yl)thiazol-4-yl)-2H-chromen-2-one, C28H20FN3O2S
  71. The crystal structure of [(tetra-μ2-2,6-difluorobenzoato-κ2O:O′)-bis-(2,6-difluorobenzoato-κ2O:O′)-bis-(1,10-phenanthroline-κ2N:N′)]dierbium(III) C66H34N4O12F12Er2
  72. Crystal structure of bis(3-chloro-N-(1-(pyrazin-2-yl)ethylidene)benzohydrazonato-k3N,N′,O)nickel(II), C26H20N8O2Cl2Ni
  73. Crystal structure of (E)-3-(3-(5-methyl-1-phenyl-1H-1,2,3-triazol-4-yl)-1-phenyl-1H-pyrazol-4-yl)-1-phenylprop-2-en-1-one, C27H21N5O
  74. Crystal structure of (E)-N′-((4-aminophenyl)sulfonyl)-N,N-dimethylformimidamide, C9H13N3O2S
  75. Crystal structure of η6-p-cymene-iodido-(N-isopropyl-1-(pyridin-2-yl)methanimine-κ2N,N′)ruthenium(II) hexafluorophosphate(V), C19H26IN2F6Ru
  76. Crystal structure of 6-iodo-3-phenyl-2-propylquinazolin-4(3H)-one, C17H15IN2O
  77. Low temperature redetermination of the crystal structure of catena-poly[[tri-4-fluorobenzyltin(IV)]μ2-pyridine-4-carboxylato-κ2N:O], {C27H22F3NO2Sn}n
  78. Crystal structure of bis(2-propyl-1H-benzo[d]imidazol-3-ium) tetrachloridozincate(II), C10H13Cl4N2Zn
  79. The crystal structure of (Z)-3-hydrazono-5-nitroindolin-2-one – dimethyl sulfoxide (1/1), C8H6N4O3
  80. Crystal structure of bis-[N-(1-pyrazin-2-yl-ethylidene)-cyanoacetic acid-hydrazonato-κ3O,N,N′)]-zinc(II), C18H16N10O2Zn
  81. Crystal structure and photochromism of 1-(2,5-dimethyl-3-thienyl)-2-[2-methyl-5-(benzaldoxime)-3-thienyl] perfluorocyclopentene, C23H17F6NOS2
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