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      "body": "Congratulations @matablanco! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@matablanco/birthday2.png</td><td>Happy Birthday! - You are on the Steem blockchain for 2 years!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@matablanco) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=matablanco)_</sub>\n\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
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      "body": "Congratulations @matablanco! You have completed some achievement on Steemit and have been rewarded with new badge(s) :\n\n[![](https://steemitimages.com/70x80/http://steemitboard.com/notifications/firstpost.png)](http://steemitboard.com/@matablanco) You published your First Post\n[![](https://steemitimages.com/70x80/http://steemitboard.com/notifications/firstvoted.png)](http://steemitboard.com/@matablanco) You got a First Vote\n\nClick on any badge to view your own Board of Honor on SteemitBoard.\nFor more information about SteemitBoard, click [here](https://steemit.com/@steemitboard)\n\nIf you no longer want to receive notifications, reply to this comment with the word `STOP`\n\n> Upvote this notification to help all Steemit users. Learn why [here](https://steemit.com/steemitboard/@steemitboard/http-i-cubeupload-com-7ciqeo-png)!",
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      "body": "This is an abstract for a paper chosen to present a seminar in the Simón Bolívar University:\n\n Synthesis, structures, and antimalarial activities of some silver(I), gold(I) and gold(III) complexes involving N-heterocyclic carbene ligands\n\nHemmert Catherine, Fabié Aymeric, Fabre Aude, Benoit-Vical Franςóise, Gornitzka Heiz\nEuropean Journal of Medicinal Chemistry 60 (2013) 64-75\n\nMetal-NHC complexes (NHC, N-heterocyclic carbene), are species widely studied due to the chemical and structural versatility offered by the NHC. One of the types of metal-NHC complexes evaluated in the area of medicinal chemistry are the silver (I) compounds [Ag(I)-NHC], these were the first to show various types of biological activities, such as antimicrobial and anticancer activity. However, its main application in this area to act as NHC transfer agents. This has allowed expanding the synthetic possibilities and the study of metal-NHC complexes with various metal centers. Among them, the gold (I) and gold (III) complexes which have shown anticarcinogenic, antiarthritic, and antimicrobial activity. Malaria is still the parasitic disease with the biggest impact in the world and the Plasmodium parasite, has shown strong resistance to chloroquine. Because of this, Hemmert et.al. sought to synthesize new metal-NHC complexes which might present antimalarial activity against those strains resistant to chloroquine, as well as to evaluate their possible antifungal activity.\n\nThe authors propose to study the possible antifungal and antimalarial activity of 15 compounds previously reported by Hemmert et al. The authors report the synthesis and characterization of a second series of mono and dinuclear silver (I) and gold (I) carbenic complexes, obtained from bis(imidazolium) salts, also synthesized and reported by their work (fig.1). With this series of complexes, the authors propose to evaluate the structure-activity relationships of the new ligands. Specifically, how these structural changes can affect the antimalarial activity of them.\n\n\n![](https://steemitimages.com/DQmTy7USqtTJAADbBNmU52XTkC5tpuKAnMmcvvx9Fs8Sgg3/image.png)\nFig.1 First series of dinuclear complexes \n\n![](https://steemitimages.com/DQmdUhCtJoq1QV3aLDWVLqYqBnLcUjbJca9tbLNGyfdVVfA/image.png)\nFig. 2 Carbene precursors of the second series of complexes\n\nBy evaluating the antimalarial and antifungal activity of the first series of compounds (figure 1), the best results corresponded to the silver (I) dinuclear complexes (5-8) for both cases. They showed lower IC50 levels and MIC for Candidemia, however, all had hemolytic properties. Subsequently, the evaluation of the second series of mono and dinuclear complexes of gold (I) and silver (I) was carried out, which showed, in their majority, antiplasmodic (antimalarial) properties. Highlighting the complexes of the type Au(I)-bis(NHC) which mostly showed IC50 values lower than the complexes of the first series (fig.1), it was also possible to eliminate the hemolytic properties in all the synthesized complexes.",
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      "body": "In the following article an overview of a paper is presented. It was a requirement for the presentation of a seminar in the Simón Bolívar University, Venezuela:\n\nSynthesis, Characterization, Crystal Structures, and Catalytic C–C Coupling and Hydrosilylation Reactions of Palladium(II) Complexes Derived from CNC Pincer-Type N-Heterocyclic Carbenes\n\nRosenani A. Haque, Patrick O. Asekunowo, Srinivasa Budagumpi, Linjun Shao.\nEuropean Journal of Inorganic Chemistry, 2015, 19, 3169-3181.\n\nMetal complexes derived from N-heterocyclic carbenes (NHC) have developed a growing interest in researchers during the past 20 years due to their wide range of applications. Particularly, it has been shown that Pd (II) complexes with this type of ligand have potential as catalysts in CC coupling reactions due to the nature of the metal center, which can be adjusted by modifying the oxidation state and strength of the NHC ligand.\nMost studies have focused on the development of Pd (II)-NHC mononuclear complexes with the general formula [(NHC)2-PdCl2], where NHC is an compound derived from imidazole or benzimidazole. However, pincer-type tridentate ligands have recently been developed, and their popularity has increased due to the robustness and thermodynamic stability of the resulting complexes. The advantage of using pincers, and particularly CNC pincers, is the rapid creation of an electronically and coordinately unsaturated Pd (II) center, which is open to incoming substrate molecules.\nThe work of Haque et al. presents the synthesis of five salts of (benz) imidazolium precursors of pincer type CNC ligands, from the species shown in fig. 1 linked by pyridine units, by N-alkylation of the imidazole nucleus. Subsequently, binuclear complexes of Ag (I) were synthesized from the in situ deprotonation of the previous salts using Ag2O and through a transmetalation, the corresponding complexes of Pd (II) -NHC were obtained.\nAll the complexes were characterized by IR and NMR spectroscopy of 1H and 13C{1H}. By means of the first technique, the formation of the complexes of both Ag (I) and Pd (II) could be determined from the differences in the frequencies of the C = N and C-N bonds of (benz)imidazole and the C = N bond of pyridine, since the coordination of the free ligand to the metallic center produces a change in the vibrational modes of the molecule due to the rigidity of the interaction. On the other hand, NMR techniques allowed to evidence the formation of carbine, by means of the disappearance of the signal from one of the protons and the low field displacement of the carbon signal corresponding to the formation of the complexes. Three of the Pd (II) compounds could be characterized by X-ray diffraction, confirming the distortion of the square planar geometry around the metal center.\n\n![](https://steemitimages.com/DQmRa1thk92dJmBvQoDGQ2E6X7aGZuigTrxjHWb9Wsc94hS/image.png)\nFig. 1. Species derived from (benz)imidazole used in the synthesis of pincer ligands.\n\nThe catalytic potential of the Pd (II) complexes was demonstrated from its activity in the Suzuki-Miyaura and Heck-Mizoroki reactions in the aqueous phase, in which a cross-coupling between phenylboronic acid and n-butylacrylate was carried out with a series of substrates. For the first case, high yields were obtained (71-99%); while in the second, lower conversions were obtained (14-21%). Likewise, the catalytic potential of all the Pd (II) complexes in hydrosilation reactions was studied, obtaining moderate yields (37-57%).",
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