Keywords
1
2
4
5-tetracyanobenzene
charge-transfer complexes
cyclic voltammetry.
diazadiphosphapentalenes
electronic spectroscopy
phosphinidenes
X-ray diffraction
Abstract
Synthesis of 2,5-dimethyl-3,6-di(2-thienyl)-3a,6a-diaza-1,4-diphosphapentalene was accomplished. Interaction of this compound with 1,2,4,5-tetracyanobenzene afforded black crystals of the 1 : 1 adduct containing π-stacks of D-A units with short interplanar spacing of 3.26 A inside the unit and 3.47 A between the D-A units, where tetracyanobenzene is an acceptor of 0.2 e. Estimation of the HOMO−LUMO gap from the onset of optical absorption gave value of 1.28 eV.
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