27980-45-6

Basic information

• Product Name: 5-(4-Nitrobenzylidene)-5H-dibenzo[a,d]cycloheptene
• Synonyms: 5-(4-Nitrobenzylidene)-5H-dibenzo[a,d]cycloheptene
• CAS NO: 27980-45-6
• Molecular Formula: C₂₂H₁₅NO₂
• Molecular Weight: 325.36
• Mol File: 27980-45-6.mol
• Article Data: 2

Chemical Properties

• Boiling Point: 463.7±24.0 °C(Predicted)
• Appearance: /
• Density: 1.267±0.06 g/cm3(Predicted)
• CAS DataBase Reference: 5-(4-Nitrobenzylidene)-5H-dibenzo[a,d]cycloheptene(CAS DataBase Reference)
• NIST Chemistry Reference: 5-(4-Nitrobenzylidene)-5H-dibenzo[a,d]cycloheptene(27980-45-6)
• EPA Substance Registry System: 5-(4-Nitrobenzylidene)-5H-dibenzo[a,d]cycloheptene(27980-45-6)

Safety Data

• Hazardous Substances Data: 27980-45-6(Hazardous Substances Data)

Upstream product

• 2222-33-5 dibenzosuberenon 
• 2609-49-6 diethyl p-nitrobenzylphosphonate 

Relevant articles and documents

Fulvenyl-Functionalized Polyisocyanides: Cross-Conjugated Electrochromic Polymers with Variable Optical and Electrochemical Properties

We describe the preparation of arylisocyanide monomers bearing conjugated fulvenyl groups derived from 9-benzylidene-9H-fluorene (Flu), 5-benzylidene-1,2,3,4-tetraphenylcyclopentadiene (TPCp), and 5-benzylidene-5H-dibenzo[a,d]cycloheptene (Dbs). The electrochemical and optical properties of the monomers and their precursors have been characterized and consistently showed the effect of the conjugation of the respective functional group (-NO2, -NH2, -NHCHO, and N-C) with the fulvenyl moiety. The isocyanides have been subsequently polymerized to the corresponding polyisocyanides (PICs), which exhibited number-average molecular weights of 124-136 kDa (PDI = 2.0-2.7), as determined by gel permeation chromatography in THF vs polystyrene standards. The thermal, optical, and electrochemical properties of the polymers have been studied in detail. Spectroelectrochemical analyses of polymers equipped with redox-active pentafulvene groups show reversible electrochromism, which allows to lower the optical gap from 2.38 to 1.20 eV (Flu) and from 2.27 to 1.55 eV (TPCp) via chemical or electrochemical reduction.