Giant Micelles of Organoplatinum(II) Gemini Amphiphiles

Abstract

Organoplatinum(II) gemini amphiphiles with two different chain lengths are synthesized and characterized. Self-assembly at the air-water interface is investigated as a function of chain length and reduction in surface area by using Langmuir-trough techniques. The Langmuir-trough experiments lead to a conjecture that surface aggregates may be the adsorbing units. Atomic force microscopy on the transferred Langmuir-Schaefer films reveals spontaneous formation of wormlike micellar aggregates. A shear-induced transition and alignment are proposed for the observed effects.

Self‐Assembly of a Triangle‐Shaped, Hexaplatinum‐Incorporated, Supramolecular Amphiphile in Solution and at Interfaces

“…The 9,10‐dioctadecyloxyphenanthrene derivatives ( 2 , 3 and 4 ) of dibrominated compound 1 are prepared as outlined in Scheme . The procedure was adapted from earlier reports 9a,b. The platinum(II) insertion product 3 was obtained by a double oxidative addition of tris(triethylphosphine)platinum(0)8d to compound 2 .…”

“…Silanization : The procedure for preparing self‐assembled monolayers (SAM) of octadecyltrichlorosilane (CH 3 (CH 2 ) 17 SiCl 3 , OTS) on Si wafers was followed from earlier reports 9b,c. Substrates (∼10×5 mm 2 ) were cut from a polished N + ‐type Si(111) wafer (MEMC Electronic Materials, Malaysia).…”

Understanding the role of the flexible bridging linker through kinetics and mechanistic study of Pt(ii) amphiphiles derived from a bis(2-pyridylmethyl)amine chelate head group

“…27- 29 The amphiphilic structures of the ligands thus, lend their interfacial surfactants properties, bringing in tailor-made structural organization in the molecules of the metal complexes at the different media interfaces. 30 This behaviour can be exploited in biological systems to increase the affinity of anti-tumour active Pt(II) compounds at the double-layered phospholipid interface of plasma cell membranes and thus facilitating their efficient entry into the cell. [31][32][33] Loss of pendant groups through translabilization, 34 which can be induced by the coordination of strong sulfur containing co-ligands is mitigated by chelation at the metal centres.…”

Broadband spectra with fluorescence and phosphorescence dual emission from bichromophoric platinum metallomesogens containing a 6,12-dihydro-indeno[1,2-b]fluorene linkage

“…[3][4][5][6][7][8][9][10][11][12][13] In addition, their square-planar geometry is highly suitable for self-assembling processes that can lead to luminescent materials with controlled morphologies. [14][15][16][17][18][19][20] This unique combination of photophysical and structural properties has made platinum complexes very popular for many applications like photocatalysis, 21,22 bioimaging, [23][24][25] sensing, 26,27 photodynamic therapy. 28,29 An important application for cyclometallated Pt complexes is as phosphorescent emitters for organic light-emitting diodes (OLEDs).…”