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Organo‐ and Hydrogelators Based on Luminescent Monocationic Terpyridyl Platinum(II) Complexes with Biphenylacetylide Ligands
Author(s) -
Wang Jia,
Chen Yong,
Law YuenChi,
Li Meiyi,
Zhu MingXin,
Lu Wei,
Chui Stephen SinYin,
Zhu Nianyong,
Che ChiMing
Publication year - 2011
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201100316
Subject(s) - chemistry , counterion , crystallography , biphenyl , hydrogen bond , alkyl , luminescence , supramolecular chemistry , intermolecular force , powder diffraction , crystallinity , photochemistry , platinum , polymer chemistry , crystal structure , molecule , organic chemistry , ion , materials science , catalysis , optoelectronics
A series of phosphorescent terpyridyl platinum(II) complexes with ancillary biphenylacetylide ligands, namely, [(R 3 tpy)PtC≡C(biphenyl)]X (R= t Bu, H, or Et 2 N; tpy=2,2′;6′,2′′‐terpyridyl; X is an anion) were synthesized and structurally characterized by various spectroscopic techniques and X‐ray diffraction methods. Despite a lack of long alkyl chain(s) or hydrogen‐bonding motif(s), complexes [(tpy)PtC≡C(biphenyl)]Cl and [( t Bu 3 tpy)PtC≡C(biphenyl)]X (X=Cl, ClO 4 , PF 6 , or BF 4 ) were found to gelate water and organic solvents, respectively. The self‐aggregation of these complexes in solutions and the resulting gels were investigated with variable‐temperature (VT) 1 H NMR spectroscopy, polarized optical microscopy, and absorption/emission spectroscopy. SEM micrographs on dry gels revealed entangled nanofibers with diameters of 20–40 nm and lengths of tens of micrometers. Powder X‐ray diffraction (PXRD) study revealed various degrees of crystallinity of these fibrillar nanostructures. The substituents on both the terpyridyl and acetylide ligands and counterion of these complexes play a profound but concerted role in tuning the intermolecular metal⋅⋅⋅metal and/or π–π interactions, and hence the gelation properties.