Organized Nanostructured Complexes of Polyoxometalates and Surfactants that Exhibit Photoluminescence and Electrochromism

Abstract

A variety of functional nanostructured organic/inorganic hybrid materials from the europium‐exchanged derivative of a Preyssler‐type polyoxometalate (POM), [EuP5W30O110]12−, and functional organic surfactants were prepared by the ionic self‐assembly (ISA) route. The effect of organic surfactants on the structure, photoluminescent, electrochemical and electrochromic properties of the POM anions was investigated in detail. All obtained hybrid materials are amphotropic, i.e., exhibit both thermotropic and lyotropic liquid‐crystalline phase behaviour. Investigations of their photophysical properties have shown that the interactions of the various surfactants with the polyanions influence the coordination environments and site symmetry of Eu3+ in different ways. The functional groups in the organic surfactants significantly influence the electrochromic properties and photoluminescence of POMs. Different from normal and pyridine‐containing complexes, no photoluminescence and no electrochromism were observed from the ferrocene‐containing complexes. This may be explained in view of charge transfer between the POM anion and the ferrocenyl group.

EuIII‐Doping of Lamellar Bilayer and Amorphous Mono‐Amide Cross‐Linked Alkyl/Siloxane Hybrids

“…[16] Among the works that were published subsequently, [17,18] it is of particular interest to refer to the synthesis of the first photoluminescent Eu 3+ -doped lamellar polysilsesquioxanes selftemplated through a hydrogen-bonding array. [19] In the present work, we have incorporated for the first time Eu 3+ ions into two chemically similar but structurally different mono-amidosil host matrices, m-A(x) with x = 8 and 14, where x represents the number of CH 2 groups directly bonded to the carbonyl group of the amide cross-link (Scheme 1).…”

Inorganic–Organic Hybrid Surfactant Crystals: Structural Aspects and Functions

“…The layered POM-surfactant hybrids with two-dimensional anisotropy have been assembled as liquid crystals [105], thin films [101,103,106], and mesostructured solids [100,102,[107][108][109][110][111][112]. However, most of them are materials with atomically ill-ordered structure.…”

“…POM-surfactant hybrids can allow fine tuning of the structure and function by changing the combination of POM anion and surfactant cation. Several properties have been investigated as amphiphilic [98][99][100], magnetic [101], catalytic [102], electrochemical [103], and photoluminescent [103][104][105][106] materials.…”

An Intriguing Morphology Evolution of Polyoxometalate‐Polystyrene Hybrid Amphiphiles from Vesicles to Tubular Aggregates

“…Although the self-assembly of a POM-based hybrid for constructing POMfunctionalized structures has been extensively reported, [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] studies on POM-polymer hybrids are still scarce. Previously, we reported on the synthesis of a novel hybrid polymer composed of a POM head {(Bu 4 N) 5 [H 4 P 2 W 15 V 3 O 62 ]} and a polystyrene (PS) tail via ATRP.…”