Abstract
Self-assembled molecular triangles [Pd3(phen)3(imidazolate)3](NO3)3, 1a and [Pd3(phen)3 (imidazolate)3](PF6)3, 1b are prepared by the combination of imidazole with Pd(phen)(NO3)2 and Pd(phen) (PF6)2, respectively. Imidazole was deprotonated during the complexation reactions and the imidazolate so formed acted as a bis-monodentate bridging ligand to form the bowl-shaped trinuclear architectures of 1a/b. Relative orientation of the imidazolate moieties can be best described as syn,anti,antias observed in the crystal structure of 1b. However, in solution state, slow conformational changes are assumed on the basis of 1HNMR spectral data. The molecular triangles are crafted with three peripheral phen units capable of π−π stacking interactions. Well-fashioned intermolecular π−π interactions are observed in the solid-state, wherein further self-assembly of already self-assembled triangle is observed.
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Acknowledgements
We thank DST, India (Project No. SB/S1/IC-05/2014) for financial support.We acknowledge the single crystal X-ray Diffractometer facility funded by IIT Madras.
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The 1H NMR, H-H COSY, ESI-MS spectra are provided (figures S1–S9). X-ray crystallographic data in CIF format for the structure of 1b are also included. For details, see www.ias.ac.in/chemsci.
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NARANTHATTA, M.C., RAMKUMAR, V. & CHAND, D.K. Role of peripheral phenanthroline groups in the self-assembly of self-assembled molecular triangles. J Chem Sci 127, 273–280 (2015). https://doi.org/10.1007/s12039-015-0776-3
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DOI: https://doi.org/10.1007/s12039-015-0776-3