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(L) 2 C 2 P 2 : Dicarbondiphosphide Stabilized by N‐Heterocyclic Carbenes or Cyclic Diamido Carbenes
Author(s) -
Li Zhongshu,
Chen Xiaodan,
Andrada Diego M.,
Frenking Gernot,
Benkö Zoltán,
Li Yaqi,
Harmer Jeffrey R.,
Su ChengYong,
Grützmacher Hansjörg
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201612247
Subject(s) - chemistry , electrophile , molecule , yield (engineering) , conjugated system , ring (chemistry) , group 2 organometallic chemistry , stereochemistry , medicinal chemistry , carbon fibers , crystallography , organic chemistry , catalysis , materials science , polymer , metallurgy , composite number , composite material
Carbon phosphides, C n P m , may have highly promising electronic, optical, and mechanical properties, but they are experimentally almost unexplored materials. Phosphaheteroallenes stabilized by N‐heterocyclic carbenes undergo a one‐electron reduction to yield compounds of the type (L) 2 C 2 P 2 with diverse structures. The use of imidazolylidenes as ligands L give complexes with a central four‐membered ring C 2 P 2 , while more electrophilic cyclic diamidocarbenes (DAC) give a compound with an acyclic π‐conjugated CP−PC unit. Cyclic C 2 P 2 compounds are best described as non‐Kekulé molecules that are stabilized by coordination to the NHC ligands NHC→(C 2 P 2 )←NHC. These species can be easily oxidized to give stable radical cations [(NHC) 2 C 2 P 2 ] +. . The remarkably stable molecules with an acylic C 2 P 2 core are best described with electron‐sharing bonds (DAC)=C=P−P=C=(DAC).