Solid-state multinuclear magnetic resonance and X-ray crystallographic investigation of the phosphorus...iodine halogen bond in a bis(dicyclohexylphenylphosphine)(1,6-diiodoperfluorohexane) cocrystal

Halogen bonding to phosphorus atoms remains uncommon, with relatively few examples reported in the literature. Here, the preparation and investigation of the cocrystal bis(dicyclohexylphenylphosphine)(1,6-diiodoperfluorohexane) by X-ray crystallography and solid-state multinuclear magnetic resonance spectroscopy is described. The crystal structure features two crystallographically unique C-I...P halogen bonds [d_I...P = 3.090 (5) Å, 3.264 (5) Å] and crystallographic disorder of one of the 1,6-diiodoperfluorohexane molecules. The first of these is the shortest and most linear I...P halogen bond reported to date. ¹³C, ¹⁹F, and ³¹P magic angle spinning solid-state NMR spectra are reported. A ³¹P chemical shift change of -7.0 p.p.m. in the cocrystal relative to pure dicyclohexylphenylphosphine, consistent with halogen bond formation, is noted. This work establishes iodoperfluoroalkanes as viable halogen bond donors when paired with phosphorus acceptors, and also shows that dicyclohexylphenylphosphine can act as a practical halogen bond acceptor.

Facile polymerization method for poly(3,4-ethylenedioxythiophene) and related polymers using iodine vapour

A simple polymerization at room temperature using iodine vapour for preparation of PEDOT and PProDOT and their soluble derivatives in neat form.

Effect of flexible linker length in 3,4-ethylenedioxythiophene derivatives for solid state polymerization

EDOT-linker-EDOT was chosen as a prototype model monomer for solid state polymerization. The linker length can be up to three atoms while the four-atom linker monomer failed under SSP.

Influence of benzene ring number attached on non-conjugated 3,4-ethylenedioxythiophene derivatives for solid-state polymerization

We chose the three-atom linker EDOT–CH₂–N(R)–CH₂–EDOT as a large platform to determine boundary conditions through the introduction of a rigid or bulky moiety and to accurately control the SSP behavior.

Investigation of the substitution effect on poly(bis-3,4-ethylenedioxythiophene methine)s through solid state polymerization

EDOT–CH(R)–EDOT was chosen as a prototype model monomer for solid state polymerization (SSP). The aromatic moieties were first introduced in the branch chain in the polymer matrix.

Effect of monomers’ structure on self-acid-assisted polycondensation for the synthesis of poly(3,4-ethylenedioxythiophene) and homopolythiophene

PEDOT and homopolythiophene were synthesized by self-acid-assisted polycondensation (SAAP) based on mono-halogen substituted thiophene derivative monomers. Our results reveal that substituted halogen (bromo or iodo) positions play an important role in SAAP.

Studies on the Langmuir–Blodgett films of polythiophene containing a mesogenic side chain

LB study of mesogenic polythiophenes showed changes in optical properties due to variations in supramolecular assembly with solvent polarity.