engleski

Salen complexes as halogen bond acceptors

Imine complexes are good halogen bond acceptors towards classical halogen bond donors (i.e. perfluorinated iodobenzenes) [1]. Salen complexes, a special class of compounds within imine complexes, were found to generally act as hydrogen bond or cation receptors [2], while they have not been explored to an equal extent as potential halogen bond acceptors [3]. In order to investigate the preference of metal salen complexes as halogen bond acceptors towards perfluorinated iodobenzenes, we have cocrystallized nickel salen complex (NiL) with 14tfib in the solid state and in solution. The solid state reaction was preformed mechanochemically either with NiL and the 14tfib, or with the mixture of o- phenylenediemine, o- vanillin, nickel(II) acetate and 14tfib, so that the formation of the ligand, its complexation of nickel and formation of the cocrystal occurs in a single- pot mechanochemical reaction. In both cases the same product was obtained. Single crystals of the same product were obtained from the solution synthesis, and have shown to be a (NiL)2(14tfib) cocrystal, in which iodine acts as a halogen bond donor towards three oxygen atoms in the complex. [1] V. Nemec, K. Lisac, N. Bedeković, L. Fotović, V. Stilinović, D. Cinčić, CrystEngComm 23 (2021) 3063. [2] M. Andruh, D. G. Branzea, R. Gheorghe, A. M. Madalan, CrystEngComm 11 (2007) 2571. [3] Q. Wu, J.-C. Xiao, C. Zhou, J.-R- Sun, M.- F. Huang, X. Xu, T. Li, H. Tian, Crystals 10 (2020) 334.

halogen bond ; salen complex

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