Bolligarla, Ramababu ; Durgaprasad, Gummadi ; Das, Samar K. (2011) Synthesis, molecular structure and supramolecular chemistry of a new nickel-quinoxaline dithiolate system [Bu4N]2[Ni(6,7-qdt)2] (6,7-qdt = quinoxaline-6,7-dithiolate) and comparison of its electronic and electrochemical properties with those of [Bu4N]2[Ni(qdt)2] (qdt = quinoxaline-2,3-dithiolate) Inorganic Chemistry Communications, 14 (6). pp. 809-813. ISSN 1387-7003
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.inoche.2011.02.002
Abstract
The new nickel bis(dithiolene) complex [Bu4N]2[Ni(6,7-qdt)2] (1) (6,7-qdt = quinoxaline-6,7-dithiolate) has been synthesized, starting from quinoxaline-6,7-dithiol, nickel chloride and tetrabutylammonium bromide in methanol. Compound 1 crystallizes in P21/c space group (monoclinic system). Its crystal structure has been characterized by interesting C— H···S and C— H···N weak interactions resulting in a three dimensional supramolecular network. Complex 1 shows solvent sensitive absorption band (broad feature) in the visible region, which is attributed to charge transfer (CT) transition involving electronic excitation from a HOMO that is a mixture of dithiolate (Π) and metal (d) orbital character to a LUMO which is a Π* orbital of the dithiolate. This CT transition absorbs at low energy region in comparison to the CT band of the [Bu4N]2[Ni(qdt)2] in the visible region. Interestingly, compound 1 undergoes reversible oxidation at very low oxidation potential (E1/2 = + 0.12 V vs Ag/AgCl) compared to that of [Ni(qdt)2]2- (E1/2 = + 0.41 V vs Ag/AgCl) in MeOH solutions.
Item Type: | Article |
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Source: | Copyright of this article belongs to Elsevier Science. |
Keywords: | Nickel(II)-dithiolene; Crystal Structure; Supramolecular Chemistry; Electronic Absorption; Electrochemistry |
ID Code: | 63414 |
Deposited On: | 29 Sep 2011 04:35 |
Last Modified: | 29 Sep 2011 04:35 |
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