A Chiral Metal-Organic 1D-Coordination Polymer Upon Complexation of Phenylene-Bridged Bipyrrole and Palladium (II) Ion

Abstract

Metal-organic 1D-coordination polymers, having unique electronic and optical properties, are expected to be a novel advanced functional material capable of fabricating smart plastics, films, and fibers. In this study, we have synthesized a novel metal-organic 1D-coordination polymer composed of a phenylene-bridged bipyrrole bearing N-alkylimino groups (BPI) and palladium(II) ion. The BPI and Pd(II) form square planar bis(bidentate) complex to form a metal coordinated π-conjugation polymer (Poly-BPI/Pd). It is stable in solutions at room temperature, and allowed measurement of its average molecular weight in SEC (Mw = 106,000 and Mn = 18,000, Mw/Mn = 5.88). It also provided a reversible multi redox profile in cyclic voltammetry, most likely originating from strong π-electronic interactions between the BPI components via Pd ion. A variety of substituent groups can be attached to the imino-nitrogens of BPI. A coordination polymer composed of a BPI derivative bearing chiral alkyl chains and Pd(II) showed strong circular dichroism (CD) in the solution due to the unidirectional chiral conformation of the BPI components in the polymer backbone.

Photo-on-Demand Synthesis of Vilsmeier Reagents with Chloroform and Their Applications to One-Pot Organic Syntheses

“…Unless otherwise noted, all reagents were purchased from commercial suppliers and used without further purification. 5,5′-Dimethyldipyrromethane and 1,4-bis­(3,4-diethyl-1 H -pyrrol-2-yl)­benzene were synthesized according to the literature methods. ,,, For column chromatography, Wakogel (60N, particle size 38–100 μm, silica gel, irregular) was used. Heating of the sample solutions, if necessary, were performed with a water bath (≤50 °C) or an aluminum block bath (>50 °C).…”

Synthesis of coordination polymers based on a 2,2′-dimethoxy-1,1′-biphenyl scaffold and Hg(II), Co(II), or Zn(II)

“…Coordination polymers also referred to as metal-organic coordination networks include a large family of compounds formed by central metal ions linked to several ligands by coordination bonds. It is an infinite extension driven by a self-assembly process into one (1D), two (2D), or three dimensions (3D) [6][7][8][9][10][11].…”