Details

Autor(en) / Beteiligte

• Mukhopadhyay, Sujay
• Singh, Roop Shikha
• Biswas, Arnab
• Maiti, Biswajit
• Pandey, Daya Shankar

Titel

Molecular and Nanoaggregation in Cyclometalated Iridium(III) Complexes through Structural Modification

Ist Teil von

• European journal of inorganic chemistry, 2016-09, Vol.2016 (26), p.4199-4206

Ort / Verlag

Blackwell Publishing Ltd

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• New terpyridyl ligands TP1, TP2 and cyclometalated iridium(III) complexes 1 and 2 based on these ligands have been synthesized. The ligands and complexes have been characterized by elemental analysis and spectroscopic studies (ESI‐MS, 1H and 13C NMR, UV/Vis, fluorescence). The molecular structure of 1 has been verified by X‐ray single‐crystal analysis. It has been unambiguously established that variation of the substituents on 1 and 2 leads to molecular aggregation in 1, while 2 remains nonaggregated. Furthermore, complexes 1 and 2 have been successfully utilized as capping agents for the stabilization of gold nanoparticles (AuNPs). It is of note that 1 forms discretely, while 2 aggregates AuNPs through the assemblage of ultrasmall nanoparticles. It has been affirmed by 1H NMR titration studies that –NH groups from 1 and 2 are involved in the capping of AuNPs. The role of simple structural variations in directing molecular and nanoaggregation has been clearly established for the first time by spectroscopic (UV/Vis, fluorescence, 1H NMR titration) and morphological studies [SEM, TEM, EDX (energy‐dispersive X‐ray), DLS (dynamic light scattering)]. The role of simple structural variations in directing molecular and nanoaggregation has been established for the first time in two new cyclometalated iridium(III) complexes with the help of various spectroscopic (UV/Vis, fluorescence, 1H NMR titration) and morphological analyses [SEM, TEM, EDX (energy‐dispersive X‐ray), DLS (dynamic light scattering)].