Cylindrical NIR-Responsive Metallopolymer Containing Möbius Metalla-aromatics

Abstract

Metalla-aromatic complexes are very stable and excellent light-absorbing compounds, owing to their highly conjugated frameworks. The metallopolymers containing metalla-aromatic substructures consist of a new type of functional polymer, because they exhibit characteristics of both metalla-aromatic and polymeric units. Herein, we reported a corn-like cylindrical metallopolymer, prepared from the controlled polymerization of N-isopropylacrylamide (NIPAM) by a polyrotaxane-based macroinitiator, followed by postpolymerization modification with a photothermal metalla-aromatic complex. The corn-like shape of this metallopolymer was confirmed by transmission electron microscopy (TEM). Combining the photothermal effect of the metalla-aromatic unit and the thermosensitive property of PNIPAM, the corn-like metallopolymer exhibits a NIR-responsive behavior and represents a new smart material.

Recent advances in metallopolymer-based drug delivery systems

“…The construction of MPs is a new strategy for signicantly increase the effectiveness of biomedical materials, in particular, to address current issues of traditional methods of treatment and prophylactics. 48,[114][115][116][117][118][119][120][121][122][123][124][125][126][127][128][129][130][131][132] Research on MPs in the biomedical eld is impressive. Materials scientists are designing MPs as innovative solutions to improve the effectiveness of DDSs.…”

Optically reconfigurable shape memory metallo-polymer mediated by a carbolong complex and radically exchangeable covalent bond

“…The carbolong complex (denoted CLC556, Scheme 1a) used here is a metal bridgehead polycyclic framework featuring a long carbon chain (≥7C) coordinated to a metal via metalcarbon bonds 35,36 and has been demonstrated to be an excellent NIR-responsive photothermal conversion moiety. [37][38][39][40][41][42] The hydroxyl functionalized carbolong complex compound 1 was synthesized according to the published procedure. 37 1-(2-Hydroxy-1-phenylethoxy)-2,2,6,6-tetramethylpiperidin-4-ol (compound 2), containing a radically exchangeable TEMPObased alkoxyamine moiety (denoted TEMPO-C), was synthesized in two steps from commercially available materials (Scheme S1 †).…”

Optical and electrochemical properties of spirobifluorene iridanaphthalene complexes

“…[1][2][3][4][5][6] The interest in the metallaaromatic compounds is not only focused on their aromatic and organometallic reactivity but also on the study of their optical, electronic and thermal properties with a view to their application in molecular materials and devices. [7][8][9][10][11][12][13] Besides, organic molecules with a non-centrosymmetric electronic structure, high thermal and morphological stability and charge transfer capacity, such as allenes or spirobifluorene derivatives have taken attention in recent years. 14,15 These characteristics together with their high polarizability grant them second-order NLO properties which are of great interest for applications in optical and electro-optical devices, photodynamic therapy or biological imaging.…”