Aerobically Stable and Substitutionally Labile α-Diimine Rhenium Dicarbonyl Complexes

10.26434/chemrxiv.13606700.v1 ◽

2021 ◽

Author(s):

Kevin Schindler ◽

Aurélien Crochet ◽

Fabio Zobi

Keyword(s):

Solid State ◽

High Yield ◽

Distorted Octahedral Geometry ◽

The Core ◽

Axial Ligands ◽

Distorted Octahedral ◽

Synthetic Routes ◽

Monodentate Ligands ◽

Electron Reduction ◽

The One

New synthetic routes to aerobically stable and substitutionally labile a-diimine rhenium(I) dicarbonyl complexes are described. The molecules are prepared in high yield from the cis-cis-trans-[Re(CO)2(tBu2bpy)Br2]- anion (2, where tBu2bpy is 4,4'-di-tert-butyl-2,2'-bipyridine), which can be isolated from the one electron reduction of the corresponding 17-electron complex (1). Compound 2 is stable in the solid state, but in solution it is oxidized by molecular oxygen back to 1. Replacement of a single bromide of 2 by s-donor monodentate ligands (Ls) yields stable neutral 18-electron cis-cis-trans-[Re(CO)2(tBu2bpy)Br(L)] species. In coordinating solvents like methanol the halide is replaced giving the corresponding solvated cations. [Re(CO)2(tBu2bpy)Br(L)] species can be further reacted with Ls to prepare stable cis-cis-trans-[Re(CO)2(tBu2bpy)(L)2]+ complexes in good yield. Ligand substitution of Re(I) complexes proceeds via pentacoordinate intermediates capable of Berry pseudorotation. In addition to the cis-cis-trans-complexes, cis-cis-cis- (all cis) enantiomers are also formed. In particular, cis-cis-trans-[Re(CO)2(tBu2bpy)(L)2]+ complexes establish an equilibrium with all cis enantiomers in solution. The solid state crystal structure of nearly all molecules presented could be elucidated. The molecules adopt a slightly distorted octahedral geometry. In comparison to similar fac-[Re(CO)3]+complexes, Re(I) diacarbonyl species are characterized by a bend (ca. 7°) of the axial ligands towards the a-diimine unit. [Re(CO)2(tBu2bpy)Br2]- and [Re(CO)2(tBu2bpy)Br(L)] complexes may be considered as synthons for the preparation of a variety of new stable diamagnetic dicarbonyl rhenium cis-[Re(CO)2]+ complexes, offering a convenient entry in the chemistry of the core.

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3-(Pyridin-4-yl)acetylacetone: CdII and HgII compete for nitrogen coordination

Acta Crystallographica Section C Structural Chemistry ◽

10.1107/s2053229617011408 ◽

2017 ◽

Vol 73 (9) ◽

pp. 724-730 ◽

Cited By ~ 5

Author(s):

Khai-Nghi Truong ◽

Carina Merkens ◽

Ulli Englert

Keyword(s):

Solid State ◽

Hydrogen Bonds ◽

Carbonyl Group ◽

Coordination Sphere ◽

Aqua Ligand ◽

Polymeric Chain ◽

One Dimensional ◽

Distorted Octahedral Coordination ◽

Distorted Octahedral ◽

The One

3-(Pyridin-4-yl)acetylacetone (HacacPy) acts as a pyridine-type ligand towards CdII and HgII halides. With CdBr2, the one-dimensional polymer [Cd(μ-Br)2(HacacPy)Cd(μ-Br)2(HacacPy)2]∞ is obtained in which five- and six-coordinated CdII cations alternate in the chain direction. Reaction of HacacPy with HgBr2 results in [Hg(μ-Br)Br(HacacPy)]∞, a polymer in which each HgII centre is tetracoordinated. In both compounds, each metal(II) cation is N-coordinated by at least one HacacPy ligand. Equimolar reaction between these CdII and HgII derivatives, either conducted in ethanol as solvent or via grinding in the solid state, leads to ligand redistribution and the formation of the well-ordered bimetallic polymer catena-poly[[bromidomercury(II)]-μ-bromido-[aquabis[4-hydroxy-3-(pyridin-4-yl)pent-3-en-2-one]cadmium(II)]-di-μ-bromido], [CdHgBr4(C10H11NO2)2(H2O)] n or [{HgBr}(μ-Br){(HacacPy)2Cd(H2O)}(μ-Br)2]∞. HgII and CdII cations alternate in the [100] direction. The HacacPy ligands do not bind to the HgII cations, which are tetracoordinated by three bridging and one terminal bromide ligand. The CdII centres adopt an only slightly distorted octahedral coordination. Three bromide ligands link them in a (2 + 1) pattern to neighbouring HgII atoms; two HacacPy ligands in a cis configuration, acting as N-atom donors, and a terminal aqua ligand complete the coordination sphere. Classical O—H...Br hydrogen bonds stabilize the polymeric chain. O—H...O hydrogen bonds between aqua H atoms and the uncoordinated carbonyl group of an HacacPy ligand in a neighbouring strand in the c direction link the chains into layers in the (010) plane.

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Solid-state structure and antimicrobial and cytotoxicity studies of a cucurbit[6]uril-like Cu6 L 4 constructed from 3,5-bis[(1H-tetrazol-5-yl)methyl]-4H-1,2,4-triazol-4-amine

Acta Crystallographica Section C Structural Chemistry ◽

10.1107/s2053229618013670 ◽

2018 ◽

Vol 74 (11) ◽

pp. 1413-1419

Author(s):

Serhii Vasylevskyi ◽

Anja Holzheu ◽

Katharina M. Fromm

Keyword(s):

Solid State ◽

Distorted Octahedral Geometry ◽

Water Molecules ◽

State Structure ◽

Sulfate Anion ◽

E Coli ◽

Cytotoxicity Studies ◽

Distorted Octahedral ◽

Sulfate Hydrate ◽

Coordinated Water

3,5-Bis[(1H-tetrazol-5-yl)methyl]-4H-1,2,4-triazol-4-amine (H2 L) associates under deprotonation with CuSO4 in aqueous medium to form a new waisted barrel-shaped M 6 L 4 cluster, namely hexaaquatetrakis{μ4-3,5-bis[(1H-tetrazol-5-yl)methyl]-4H-1,2,4-triazol-4-amine}-μ4-sulfato-hexacopper(II) sulfate hydrate, [Cu6(SO4)(C6H6N12)4(H2O)6]SO4·nH2O (n = ∼23) (1). Cluster 1 resembles concave cucurbit[6]uril and has one disordered sulfate anion trapped inside the cage, which additionally stabilizes the Cu6 unit. The CuII ions have either a square-pyramidal or a distorted octahedral geometry. The equatorial positions are filled by N atoms from the L 2− ligand, while the axial positions are occupied by coordinated water molecules and O atoms of the sulfate counter-ion. In the solid state, the Cu6 clusters are connected through a large number of hydrogen bonds formed by uncoordinated water molecules and an additional sulfate anion. The compound shows good antimicrobial activity against E. coli tested with the Kirby Bauer approach. In addition, the cell viability towards HeLa and L-929 cells was studied.

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Preparation and crystal and molecular structure of (η3-octamethylcyclotetraphosphazane-P,P,P)tricarbonylmolybdenum(0), [η3-(CH3PNCH3)4]Mo(CO)3

Canadian Journal of Chemistry ◽

10.1139/v82-349 ◽

1982 ◽

Vol 60 (19) ◽

pp. 2415-2419 ◽

Cited By ~ 11

Author(s):

Keith D. Gallicano ◽

Norman L. Paddock ◽

Steven J. Rettig ◽

James Trotter

Keyword(s):

Molecular Structure ◽

Solid State ◽

Phosphorus Atom ◽

Mirror Symmetry ◽

Crystal And Molecular Structure ◽

Octahedral Geometry ◽

Distorted Octahedral Geometry ◽

Full Matrix ◽

Carbonyl Ligands ◽

Distorted Octahedral

The synthesis and physical properties of the phosphazane complex [η3-(CH3PNCH3)4]Mo(CO)3 are reported. Crystals of (η3-octamethylcyclotetraphosphazane-P,P,P)tricarbonylmolybdenum(0) are monoclinic, a = 8.6898(9), b = 16.0987(8), c = 14.1156(17) Å, β = 98.321(6)°, Z = 4, space group Cc. The structure was solved by Patterson and Fourier syntheses and was refined by full-matrix least-squares procedures to R = 0.020 and Rw = 0.024 for 2286 reflections with I ≥ 3σ(I). The molybdenum atom is coordinated to three phosphorus atoms of the (MePNMe)4 ligand and to three carbonyl ligands in a distorted octahedral geometry. The molecule has approximate mirror symmetry in the solid state. Important bond lengths (corrected for libration) are: Mo—P = 2.537(1), 2.467(1), and 2.513(1), Mo—C = 1.971(4), 2.002(4), and 1.978(4), mean P—N = 1.704(8) for coordinated P, 1.735(7) Å for uncoordinated P. The structural evidence indicates that the phosphazane is a weaker donor to Mo(CO)3 than to three sulphur atoms, and that coordination withdraws electron density from the fourth phosphorus atom. The complex is fluxional in solution.

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Crystal structures of two isostructural bivalent metal N-benzoylglycinates

Acta Crystallographica Section E Crystallographic Communications ◽

10.1107/s2056989020009287 ◽

2020 ◽

Vol 76 (8) ◽

pp. 1260-1265

Author(s):

Kedar U. Narvekar ◽

Bikshandarkoil R. Srinivasan

Keyword(s):

Crystal Structures ◽

Aqua Ligand ◽

Distorted Octahedral Geometry ◽

Central Metal ◽

Bivalent Metal ◽

One Dimensional ◽

Hydrogen Bonding Interactions ◽

Distorted Octahedral ◽

Bivalent Metals ◽

The One

The crystal structures of two coordination compounds of N-benzoylglycine, viz. catena-poly[[[diaquabis(N-benzoylglycinato)cobalt(II)]-μ-aqua] dihydrate], {[Co(C9H8NO3)2(H2O)3]·2H2O} n , 1, and catena-poly[[[diaquabis(N-benzoylglycinato)nickel(II)]-μ-aqua] dihydrate], {[Ni(C9H8NO3)2(H2O)3]·2H2O} n , 2, are described. The structures of 1 and 2 were reported previously [Morelock et al. (1979). J. Am. Chem. Soc. 101, 4858–4866] and redetermined in this work to determine the H-atom coordinates. In the isostructural compounds, the central metal is located on an inversion centre and exhibits a distorted octahedral geometry. A pair of terminal aqua ligands disposed trans to each other and a pair of monodentate N-benzoylglycinate ligands form the square base and account for four of the six vertices of the octahedron. A μ2-bridging aqua ligand links the bivalent metals into one-dimensional chains extending along the c-axis direction. The one-dimensional chains stabilized by O—H...O hydrogen bonds are interlinked by N—H...O and C—H...O hydrogen-bonding interactions.

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Synthesis and Structure of the Dinuclear Tungsten(V) Complex {HB(Me2C3N2H)3}WS(µ-S)2WS(S2PPh2)

Australian Journal of Chemistry ◽

10.1071/ch99050 ◽

1999 ◽

Vol 52 (9) ◽

pp. 827 ◽

Cited By ~ 3

Author(s):

Aston A. Eagle ◽

Robert W. Gable ◽

Charles G. Young

Keyword(s):

Octahedral Geometry ◽

Unit Cell ◽

The Other ◽

Distorted Octahedral Geometry ◽

Space Group ◽

The Core ◽

Distorted Octahedral ◽

Independent Molecules

The complex LW V S(µ-S) 2 W V S(S 2 PPh 2 ) [L = tris(3,5-dimethylpyrazol-1-yl)hydroborate] results from the reaction of LW VI O 2 Cl with PPh 3 in refluxing pyridine, followed by the addition of NH 4 S 2 PPh 2 and reflux for a further 4 days. Crystals of LWS(µ-S) 2 WS(S 2 PPh 2 )·0.5CH 2 Cl 2 are monoclinic and belong to space group Cc with a 12.356(2), b 30.067(6), c 22.082(4) Å, β 96.08(2)° and Z 8. Refinement of 10507 data measured with Mo Kα radiation converged at R 0.0466 and R w 0.1421. The two independent molecules in the unit cell are dinuclear with a syn-[W 2 S 2 (µ-S) 2 ] 2+ core. One tungsten centre is further coordinated by a tridentate L ligand, making it six-coordinate with a distorted octahedral geometry while the other bears a bidentate dithiophosphinate ligand and is five-coordinate and square- pyramidal in geometry. The terminal thio–tungsten distances average 2.120 Å, and the parameters of the core [W–W av. 2.832 Å, W–(µ-S) av. 2.311 Å, S–W–S av. 100.2°, W–S–W av. 75.2°] are typical of syn-[W 2 S 2 (µ-S) 2 ] 2+ complexes.

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The one-dimensional chain compound n-butyldichloro[2-oxido-1-naphthaldehyde (4-pyridylcarbonyl)hydrazonato]tin(IV) methanol disolvate

Acta Crystallographica Section E Structure Reports Online ◽

10.1107/s1600536806010890 ◽

2006 ◽

Vol 62 (4) ◽

pp. m925-m927

Author(s):

Shao-Wen Chen ◽

Han-Dong Yin

Keyword(s):

Schiff Base ◽

Octahedral Geometry ◽

Title Complex ◽

Distorted Octahedral Geometry ◽

Dimensional Chain ◽

One Dimensional ◽

Distorted Octahedral ◽

The One ◽

Tridentate Schiff Base ◽

Chain Compound

In the title complex, [Sn(C4H9)(C17H11N3O2)Cl2]·2CH4O, the Sn atom is in a distorted octahedral geometry, with Sn—O distances of 2.093 (3) and 2.125 (3) Å. The tridentate Schiff base coordinates to the Sn via the azomethine N atom, the hydroxyl O atom and the carbonyl O atom. The complex is stabilized by intramolecular O—H...O hydrogen bonds, forming a one-dimensional chain.

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Iminopyridine ligand complexes of group 14 dihalides and ditriflates – neutral chelates and ion pair formation

Zeitschrift für Naturforschung B ◽

10.1515/znb-2017-0128 ◽

2017 ◽

Vol 72 (11) ◽

pp. 883-894

Author(s):

Johanna Flock ◽

Beate Steller ◽

Petra Unger ◽

Birgit Gerke ◽

Rainer Pöttgen ◽

...

Keyword(s):

Solid State ◽

Ion Pairs ◽

Distorted Octahedral Geometry ◽

X Ray Diffraction ◽

Group 14 ◽

Pyridine Ligand ◽

Chloride Complexes ◽

Tin Chloride ◽

Distorted Octahedral ◽

Neutral Compounds

AbstractReaction of the chelating imino-pyridine ligand SIMPY, (SIMPY=2-(DippN=CH)-C5H4N), Dipp=2,6-iPr2-C6H3, with germanium(II) and tin(II) halides provides the respective neutral complexes [SIMPY·EX2] (EX2: E=Ge, X=Cl, Br; E=Sn, X=Cl, Br, I). The method is readily extendable to give the tin(II) triflate complex [SIMPY·Sn(OTf)2] (OTf, triflate=CF3SO3−). In the solid state, the neutral compounds [SIMPY·EX2] exist as monomers, in which the four-coordinate tetrel atoms feature a slightly distorted disphenoidal geometry around germanium and tin. Reaction of the tridentate imino-pyridine ligand DIMPY, (DIMPY=2,6-(DippN=CH)2-C5H3N) with Sn(OTf)2 provided access to a neutral tin(II) complex. Similar to the previously reported reactions leading to the germanium and tin chloride complexes [DIMPY·SnCl]+[SnCl3]−, and [Me2DIMPY·EX]+[EX3]− (Me2DIMPY=2,6-(DippN=C(Me))2-C5H3N, E=Ge, Sn; X=Cl), the reactions of DIMPY with GeX2·dioxane (X=Cl, Br) and SnX2 (X=Br, I) yielded Ge(II) and Sn(II) based ion pairs [DIMPY·EX]+[EX3]− (E=Ge, X=Cl, Br; E=Sn, X=Br, I) as a consequence of spontaneous dissociation of the group 14 dihalides. The tetrel atoms in the cationic parts in [DIMPY·EX]+[EX3]− are four-coordinate as one halide substituent is replaced by the coordination of a second imino donor group from the ligand. The anionic fragments adopt a pyramidally, tri-coordinate geometry. In contrast, the DIMPY tin(II) ditriflate complex crystallizes with two independent, neutral molecules per asymmetric unit, in which one of the tin centers is five- coordinate by interaction with three donor sites of the chelating bis(imino)pyridine ligand and two additional contacts towards the oxygen atoms of the triflate counter-anions. In the second crystallographically independent complex the tin atom is six-coordinate with a slightly distorted octahedral geometry via interaction with THF as an additional donor molecule. All compounds reported were studied by means of multinuclear NMR spectroscopy. In addition, the solid state structures of the complexes [SIMPY·EX2] (EX2: E=Ge, X=Cl, Br; E=Sn, X=Cl, Br, I), the ion pairs [DIMPY·EX]+[EX3]− (E=Ge, X=Cl; E=Sn, X=Br) and the tin(II) ditriflate [DIMPY·Sn(OTf)2] were authenticated by means of single-crystal X-ray diffraction analyses. Moreover, [DIMPY·Sn(OTf)2] was investigated by 119Sn Mössbauer spectroscopy.

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Poly[[[(2,2′-bipyridine-κ2 N,N′)cobalt(II)]-μ3-5-hydroxyisophthalato-κ4 O,O′:O′′:O′′′] dihydrate]

Acta Crystallographica Section E Structure Reports Online ◽

10.1107/s1600536806023907 ◽

2006 ◽

Vol 62 (7) ◽

pp. m1722-m1724 ◽

Cited By ~ 3

Author(s):

Xin Zhuo ◽

Zhao-Rui Pan ◽

Zuo-Wei Wang ◽

Yi-Zhi Li ◽

He-Gen Zheng

Keyword(s):

Three Dimensional ◽

Distorted Octahedral Geometry ◽

Zigzag Chain ◽

Two Dimensional ◽

Bipy Ligand ◽

One Dimensional ◽

Hydrogen Bonding Interactions ◽

Dimensional Network ◽

Distorted Octahedral ◽

The One

In the title compound, {[Co(C8H4O5)(C10H8N2)]·2H2O]} n or {[Co(OH-BDC)(2,2′-bipy)]·2H2O]} n (where OH-H2BDC is 5-hydroxyisophthalic acid and 2,2′-bipy is 2,2′-bipyridine), the Co atoms are chelated by two N atoms from the 2,2′-bipy ligand and by four O atoms from OH-BDC ligands in a highly distorted octahedral geometry. OH-BDC acts as a tetradentate ligand, with one carboxylate group chelating one Co atom and the other binding in a monodentate fashion to two other Co atoms to form a one-dimensional zigzag chain. In the crystal structure, one of the solvent water molecules lies on a crystallographic twofold axis. The one-dimensional molecular chains are assembled into a two-dimensional network via O—H...O hydrogen-bonding interactions, while π–π stacking interactions generate a three-dimensional open framework between the two-dimensional networks.

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Bis[4-(2-hydroxybenzylideneamino)benzoato-κO]tetrakis(methanol-κO)manganese(II)

Acta Crystallographica Section E Structure Reports Online ◽

10.1107/s160053680901681x ◽

2009 ◽

Vol 65 (6) ◽

pp. m634-m634 ◽

Cited By ~ 1

Author(s):

Min Zhong ◽

Jia-Huang Lin ◽

Jing Shang ◽

Ting-Hong Huang ◽

Xiu-Jian Wang

Keyword(s):

Crystal Structure ◽

Hydrogen Bonds ◽

Octahedral Geometry ◽

Mononuclear Complex ◽

Distorted Octahedral Geometry ◽

Distorted Octahedral ◽

Monodentate Ligands

In the title mononuclear complex, [Mn(C14H10NO3)2(CH3OH)4], the MnIIatom, lying on an inversion centre, exhibits a distorted octahedral geometry, defined by two O atoms from two monodentate ligands and four O atoms from four methanol molecules. The crystal structure involves intramolecular O—H...N and O—H...O and intermolecular O—H...O hydrogen bonds.

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