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Journal articles on the topic 'Cobalt-NHC complexes'

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Author: Grafiati

Published: 6 September 2023

Last updated: 7 September 2023

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1

Ertler, Daniel, Maximilian W. Kuntze-Fechner, Simon Dürr, Katharina Lubitz, and Udo Radius. "C–F bond activation of perfluorinated arenes using NHC-stabilized cobalt half-sandwich complexes." New Journal of Chemistry 45, no. 33 (2021): 14999–5016. http://dx.doi.org/10.1039/d0nj06137a.

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2

Ghadwal, Rajendra S., Jan-Hendrik Lamm, Dennis Rottschäfer, Christian J. Schürmann, and Serhiy Demeshko. "Facile routes to abnormal-NHC-cobalt(ii) complexes." Dalton Transactions 46, no. 24 (2017): 7664–67. http://dx.doi.org/10.1039/c7dt01778b.

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Deprotonation of 1 with Co{N(SiMe₃)₂}₂ affords aNHC-Co(ii) complex 2, whereas carbene transfer from 3 to Co{N(SiMe₃)₂}₂ enables access to complex 4.

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3

Iannuzzi, Theresa E., Yafei Gao, Tessa M. Baker, Liang Deng, and Michael L. Neidig. "Magnetic circular dichroism and density functional theory studies of electronic structure and bonding in cobalt(ii)–N-heterocyclic carbene complexes." Dalton Transactions 46, no. 39 (2017): 13290–99. http://dx.doi.org/10.1039/c7dt01748k.

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The combination of simple cobalt salts and N-heterocyclic carbene (NHC) ligands has been highly effective in C–H functionalization, hydroarylation and cross-coupling catalysis, though displaying a strong dependence on the identity of the NHC ligand.

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4

Rais, Eduard, Ulrich Flörke, and René Wilhelm. "Synthesis and investigation of new cyclic haloamidinium salts." Zeitschrift für Naturforschung B 71, no. 6 (June 1, 2016): 667–76. http://dx.doi.org/10.1515/znb-2016-0011.

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AbstractThe presented work describes the synthesis of new six- and seven-membered haloamidinium salts and their reaction with different metals. The isolated metal complexes were tested in a catalytic reaction. Two different synthetic routes were applied to prepare five different salts. Chloroamidinium salts were very water-sensitive in comparison to their corresponding bromoamidinium salts. Hence, the preparation of the less sensitive bromoamidinium salts was higher prioritized. The formed salts were converted with metal sources to N-heterocyclic carbene (NHC) metal complexes through an oxidative insertion into the C–X bond. This type of formation is less examined for the synthesis of extended NHC metal complexes. Pd(PPh3)4 and cobalt powder were applied as metal sources, whereby two palladium complexes were isolated, characterized, and their crystal and molecular structures determined. The palladium complexes were investigated in the Suzuki-Miyaura reaction and showed promising catalytic activity.

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5

Danopoulos, Andreas A., Alexandre Massard, Gilles Frison, and Pierre Braunstein. "Iron and Cobalt Metallotropism in Remote-Substituted NHC Ligands: Metalation to Abnormal NHC Complexes or NHC Ring Opening." Angewandte Chemie 130, no. 44 (September 19, 2018): 14758–62. http://dx.doi.org/10.1002/ange.201808008.

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6

Danopoulos, Andreas A., Alexandre Massard, Gilles Frison, and Pierre Braunstein. "Iron and Cobalt Metallotropism in Remote-Substituted NHC Ligands: Metalation to Abnormal NHC Complexes or NHC Ring Opening." Angewandte Chemie International Edition 57, no. 44 (September 19, 2018): 14550–54. http://dx.doi.org/10.1002/anie.201808008.

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7

Cesar, Vincent, Lutz H. Gade, and Stephane Bellemin-Laponnaz. "ChemInform Abstract: NHC-Cobalt, -Rhodium and -Iridium Complexes in Catalysis." ChemInform 42, no. 32 (July 14, 2011): no. http://dx.doi.org/10.1002/chin.201132229.

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8

Bołt, Małgorzata, and Patrycja Żak. "Bulky NHC–Cobalt Complex-Catalyzed Highly Markovnikov-Selective Hydrosilylation of Alkynes." Catalysts 13, no. 3 (March 2, 2023): 510. http://dx.doi.org/10.3390/catal13030510.

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The hydrosilylation of alkynes is one of the most attractive and, at the same time, most challenging catalytic transformations, usually demanding the use of noble transition metals. We describe a catalytic system, based on cobalt(0) complex and bulky N-heterocyclic carbene (NHC) ligands, permitting the highly effective hydrosilylation of a broad scope of alkynes and silanes. The application of bulky NHC ligands allowed a decrease in the amount of cobalt necessary for an effective reaction run to 2.5 mol% and provided excellent selectivity towards challenging α-vinylsilanes. The developed method tolerates a number of substituted aryl, alkyl, and silyl acetylenes. Moreover, it is suitable for both tertiary and secondary silanes. Our findings confirm that steric hindrance around the metal center can effectively increase the activity of a catalyst and ensure better selectivity than those of analogous complexes bearing smaller ligands.

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9

Hering, Florian, Johannes H. J. Berthel, Katharina Lubitz, Ursula S. D. Paul, Heidi Schneider, Marcel Härterich, and Udo Radius. "Synthesis and Thermal Properties of Novel NHC-Stabilized Cobalt Carbonyl Nitrosyl Complexes." Organometallics 35, no. 17 (August 16, 2016): 2806–21. http://dx.doi.org/10.1021/acs.organomet.6b00374.

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10

Przyojski, Jacob A., Hadi D. Arman, and Zachary J. Tonzetich. "NHC Complexes of Cobalt(II) Relevant to Catalytic C–C Coupling Reactions." Organometallics 32, no. 3 (December 18, 2012): 723–32. http://dx.doi.org/10.1021/om3010756.

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11

Hering, Florian, Johannes H. J. Berthel, Katharina Lubitz, Ursula S. D. Paul, Heidi Schneider, Marcel Härterich, and Udo Radius. "Correction to Synthesis and Thermal Properties of Novel NHC-Stabilized Cobalt Carbonyl Nitrosyl Complexes." Organometallics 35, no. 22 (November 8, 2016): 3893. http://dx.doi.org/10.1021/acs.organomet.6b00833.

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12

Sun, Jian, Yafei Gao, and Liang Deng. "Low-Coordinate NHC-Cobalt(0)-Olefin Complexes: Synthesis, Structure, and Their Reactions with Hydrosilanes." Inorganic Chemistry 56, no. 17 (August 21, 2017): 10775–84. http://dx.doi.org/10.1021/acs.inorgchem.7b01763.

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13

YUAN, HONGPING, and L. KEITH WOO. "Synthesis and Characterization of Thiol-Derivatized Porphyrins and Metalloporphyrin complexes." Journal of Porphyrins and Phthalocyanines 01, no. 02 (April 1997): 189–200. http://dx.doi.org/10.1002/(sici)1099-1409(199704)1:2<189::aid-jpp23>3.0.co;2-g.

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A series of thiol-derivatized porphyrins and the corresponding cobalt and zinc complexes were synthesized from 5-(p-aminophenyl)-10,15,20-triphenylporphyrin ( H 2 TPP - NH 2), and 5α,15α-bis(o-aminophenyl)porphyrin ( H 2 DPE - ( NH 2)2). These derivatized porphyrins have a different number of thiol appendages attached via amide linkages at different locations. The thiol-derivatized porphyrins made from H 2 TPP - NH 2, H 2 TPP - NHC ( O )( CH 2) n SH ( n = 2, 4, 5, 10), have one alkyl-thiol appendage attached to the porphyrin through an amide linkage on the p-aminophenyl position. The derivatives made from H 2 DPE -( NH 2)2 have two alkyl-thiol appendages attached to the porphyrin through amide linkages on the o-aminophenyl positions on the same face of the porphyrin ring. These thiol-derivatized porphyrins are important adsorbates for the preparation of thiol–porphyrin monolayers on gold.

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14

Lubitz, Katharina, and Udo Radius. "The Coupling of N-Heterocyclic Carbenes to Terminal Alkynes at Half Sandwich Cobalt NHC Complexes." Organometallics 38, no. 12 (June 10, 2019): 2558–72. http://dx.doi.org/10.1021/acs.organomet.9b00241.

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15

Sun, Jian, Lun Luo, Yi Luo, and Liang Deng. "An NHC-Silyl-NHC Pincer Ligand for the Oxidative Addition of C−H, N−H, and O−H Bonds to Cobalt(I) Complexes." Angewandte Chemie International Edition 56, no. 10 (January 27, 2017): 2720–24. http://dx.doi.org/10.1002/anie.201611162.

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16

Sun, Jian, Lun Luo, Yi Luo, and Liang Deng. "An NHC-Silyl-NHC Pincer Ligand for the Oxidative Addition of C−H, N−H, and O−H Bonds to Cobalt(I) Complexes." Angewandte Chemie 129, no. 10 (January 27, 2017): 2764–68. http://dx.doi.org/10.1002/ange.201611162.

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17

Wang, Dongyang, Yuhang Lai, Peng Wang, Xuebing Leng, Jie Xiao, and Liang Deng. "Markovnikov Hydrosilylation of Alkynes with Tertiary Silanes Catalyzed by Dinuclear Cobalt Carbonyl Complexes with NHC Ligation." Journal of the American Chemical Society 143, no. 32 (August 4, 2021): 12847–56. http://dx.doi.org/10.1021/jacs.1c06583.

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18

Gao, Yafei, Guangyu Li, and Liang Deng. "Bis(dinitrogen)cobalt(−1) Complexes with NHC Ligation: Synthesis, Characterization, and Their Dinitrogen Functionalization Reactions Affording Side-on Bound Diazene Complexes." Journal of the American Chemical Society 140, no. 6 (January 31, 2018): 2239–50. http://dx.doi.org/10.1021/jacs.7b11660.

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19

Lubitz, Katharina, Varun Sharma, Shashank Shukla, Johannes H. J. Berthel, Heidi Schneider, Christoph Hoßbach, and Udo Radius. "Asymmetrically Substituted Tetrahedral Cobalt NHC Complexes and Their Use as ALD as well as Low-Temperature CVD Precursors." Organometallics 37, no. 7 (March 16, 2018): 1181–91. http://dx.doi.org/10.1021/acs.organomet.8b00060.

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20

Chen, Lizhu, Xiaojun Su, and Jonah W. Jurss. "Electrocatalytic hydrogen evolution from water at low overpotentials with cobalt complexes supported by redox-active bipyridyl-NHC donors." Chinese Journal of Catalysis 43, no. 12 (December 2022): 3187–94. http://dx.doi.org/10.1016/s1872-2067(22)64151-2.

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21

Wang, Gao-Feng, Xiao-Jiao Song, Fei Chen, Yi-Zhi Li, Xue-Tai Chen, and Zi-Ling Xue. "Formation of stable iron/cobalt NHC complexes via unexpected ring opening and in situ generation of a tridentate ligand." Dalton Transactions 41, no. 36 (2012): 10919. http://dx.doi.org/10.1039/c2dt30894k.

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22

Tian, Yingying, Theo Maulbetsch, Ronja Jordan, Karl W. Törnroos, and Doris Kunz. "Synthesis and Reactivity of Cobalt(I) and Iridium(I) Complexes Bearing a Pentadentate N-Homoallyl-Substituted Bis(NHC) Pincer Ligand." Organometallics 39, no. 8 (April 13, 2020): 1221–29. http://dx.doi.org/10.1021/acs.organomet.0c00018.

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23

Zarzycki, Bartosz, F. Matthias Bickelhaupt, and Udo Radius. "Symmetrical P4 cleavage at cobalt half sandwich complexes [(η5-C5H5)Co(L)] (L = CO, NHC) – a computational case study on the mechanism of symmetrical P4 degradation to P2 ligands." Dalton Transactions 42, no. 20 (2013): 7468. http://dx.doi.org/10.1039/c3dt50267h.

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24

Simler, Thomas, Pierre Braunstein, and Andreas A. Danopoulos. "Cobalt PNCNHC ‘pincers’: ligand dearomatisation, formation of dinuclear and N2 complexes and promotion of C–H activation." Chemical Communications 52, no. 13 (2016): 2717–20. http://dx.doi.org/10.1039/c5cc10121b.

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Ligand dearomatisation in Co^II phosphino-picoline NHC-type pincers and dicobalt complexes result from side-arm metalation or C–H activation at the NHC backbone; in the latter case, an ‘anionic dicarbene’ originates from a dearomatised Co^I–N₂ complex.

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25

Abubakar, Samaila, Musa Muktari, and Rifkatu Kambel Dogara. "Antimicrobial Activities of Co (III), Mono and Tri-nuclear Ni Complexes Containing Schiff base Functionalized Imidazolium based Ligands." Asian Journal of Chemical Sciences, July 31, 2021, 32–40. http://dx.doi.org/10.9734/ajocs/2021/v10i219089.

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We reported the antimicrobial activities of cobalt and nickel complexes containing imino-NHC ligands. Complex 2 was synthesized by direct reaction of the insitu generated free carbene from 2-[2-(3-benzylimidazol-1-yl)ethyliminomethyl]phenol ligand with NiCl2 diglyme while complexes 3-5 were previously reported as catalysts in the transfer hydrogenation reaction of ketones. The compounds 1-5 were screened for antimicrobial sensitivity test against four gram-negative bacteria Escherichia Coli (E-coli), Shigella, Klebsiella Pneumoniae (K. Pneumoniae) and Salmonella Typhi (S.Typhi) and a gram positive bacteria Staphylocossus aureus (S.aureus). At a varying concentrations of 100, 200, 300, 400 and 500 µg/mL, significant activities were recorded using disc diffusion methods. The cobalt complex 3 was found to have higher activities compared with the corresponding nickel complexes and among the three nickel complexes, nickel complex with pyridine as wingtip was found to be more active than the one with a benzyl group. Similarly, the nickel centre with mononuclear was found to be more active than the tri-nuclear nickel complex. Except for the cobalt complex 3 no activity was recorded against S. typhi for all the nickel compounds.

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26

Zhou, Lan, Dongyang Wang, Chengbo Yang, and Liang Deng. "Four-coordinate disilyl cobalt(II) complexes with NHC ligation: synthesis, characterization, and reactivity." Chinese Chemical Letters, June 2023, 108682. http://dx.doi.org/10.1016/j.cclet.2023.108682.

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27

Abubakar, Samaila, Musa Muktari, and Rejoice Atiko. "Synthesis, Characterization and Antimicrobial Activities of Co (III) and Fe (III) Complexes of Imino-N-heterocyclic Carbenes Ligands." Chemical Science International Journal, July 31, 2021, 59–67. http://dx.doi.org/10.9734/csji/2021/v30i630238.

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The synthesis and antimicrobial application of Co (III) and Fe (III) complexes of imine functionalized N-heterocyclic carbene (Imino-NHC) ligands is reported. The ligand precursors 1-(2-[(hydroxyl-benzylidene)-amino]-ethyl)-3-R-3H-imidazol-1-ium bromide where R = pyridyl (1a) and benzyl (1b) have been reported in our previous work. The in-situ generated ligands of 1a and 1b have been successfully coordinated to CoBr2 and [FeI(Cp)(CO)2] leading to the isolation of air-stable N^C^N^O four coordinate Co(III) complex 2 and a six-coordinate Fe(III) complex 3. The synthesised complexes were both found to be NMR inactive hence were characterize using FTIR and LRMS. The complexes were screened for antimicrobial activities against four gram-negative bacteria Escherichia Coli (E-coli), Shigella, Klebsiella pneumoniae (K. Pneumoniae) and Salmonella typhi (S. typhi) and a gram positive bacteria Staphylocossus aureus (S. aureus). The antimicrobial test was conducted using disc diffusion methods and based on the concentrations of 100, 200, 300, 400 and 500 µg/ mL, significant activities were recorded for both cobalt and the iron complexes.

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