Palladium(II) complexes of 2-pyridylmethylamine and 8-aminoquinoline: A crystallographic and DFT study
作者:Kate J. Akerman、Chané Venter、Leigh A. Hunter、Matthew P. Akerman
DOI:10.1016/j.molstruc.2015.02.077
日期:2015.7
Two nominally square planar palladium(II) chelates: dichloro-(2-aminomethylpyridine-N,N')-palladium(II) ([Pd(L1)Cl-2]) and dichloro-(8-aminoquinoline)-palladium(II) ([Pd(L2)Cl-2]) have been synthesised and studied by X-ray crystallography and DFT methods. [Pd(L1)Cl-2] crystallised in the monoclinic space group C2/c. In the solid state this compound exists as a one-dimensional supramolecular structure supported by N-H center dot center dot center dot Cl hydrogen bonds and metallophilic Pd center dot center dot center dot Pd interactions. The same hydrogen bonding motif leads to a two-dimensional supramolecular structure in the case of [Pd(L2)Cl-2]; this structure is devoid of metallophilic interactions. DFT simulations show that the planar geometry of [Pd(L1)Cl-2] in the solid state is not the lowest energy conformation. An out-of-plane distortion of the methylene group leads to a structure ca. 11 kJ mol(-1) lower in energy. The NBO partial charges provide insight into the stability of the hydrogen bonding motif. TD-DFT calculations were used to delineate the experimental UV-visible spectra. (C) 2015 Elsevier B.V. All rights reserved.