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Component Selection in the Self‐Assembly of Palladium(II) Nanocages and Cage‐to‐Cage Transformations
Author(s) -
Samanta Dipak,
Mukherjee Partha Sarathi
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201402553
Subject(s) - chemistry , palladium , moiety , imidazole , ligand (biochemistry) , cage , hydrogen bond , pyridine , nanocages , supramolecular chemistry , self assembly , acceptor , molecule , crystallography , stereochemistry , combinatorial chemistry , crystal structure , catalysis , organic chemistry , biochemistry , receptor , mathematics , physics , combinatorics , condensed matter physics
Dynamic supramolecular systems involving a tetratopic palladium(II) acceptor and three different pyridine‐ and imidazole‐based donors have been used for self‐selection by a synergistic effect of morphological information and coordination ability of ligands through specific coordination interactions. Three different cages were first synthesized by two‐component self‐assembly of individual donor and acceptor. When all four components were allowed to interact in a reaction mixture, only one out of three cages was isolated. The preferential binding affinity towards a particular partner was also established by transforming a non‐preferred cage into a preferred cage by interaction with the appropriate ligand. Computational studies further supported the fact that coordination interaction of imidazole moiety to Pd II is enthalpically more preferred compared to pyridine, which drives the selection process. Analysis of crystal packing of both complexes indicated the presence of strong hydrogen bonds between nitrate and water molecules and also H‐bonded 3D networks of water. Both complexes exhibit promising proton conductivity (10 −5 to ca. 10 −3 S cm −1 ) at ambient temperature under a relative humidity of circa 98 % with low activation energy.