The Radical Anion and Dianion of Benzo[3,4]cyclobuta[1,2-b]phenazine [NMR data]
<|begin_of_text|><|start_header_id|>system<|end_header_id|> You are a research archivist expert in dataset metadata. Answer the question truthfully.  <|eot_id|><|start_header_id|>user<|end_header_id|> Here is the Description of a dataset. Description:'The data set includes the NMR data for the puplication: 'The Radical Anion and Dianion of Benzo[3,4]cyclobuta[1,2-b]phenazine'.We present the reduction of two azaarenes, featuring a single cyclobutadiene unit, to their radical anions and dianions. The reduced species were prepared with potassium naphthalenide in the presence of 18-crown-6 in THF. The crystal structures of the reduced representatives were obtained and their optoelectronic properties were evaluated. The charge of these 4n-Hückel systems leads to dianionic 4n+2 π-electron systems with enhanced antiaromaticity according to NICS(1.7)ZZ calculations, which exhibit unusually red-shifted absorption spectra' . Please return only a json list of at most 3 Keywords corresponding to the Description:.<|eot_id|><|start_header_id|>assistant<|end_header_id|> {"Answer" : ["azaacene","biphenylene","dianion"]} <|eot_id|>
 Here is the Description of a dataset. Description:'The data set includes the NMR data for the puplication: 'The Radical Anion and Dianion of Benzo[3,4]cyclobuta[1,2-b]phenazine'.We present the reduction of two azaarenes, featuring a single cyclobutadiene unit, to their radical anions and dianions. The reduced species were prepared with potassium naphthalenide in the presence of 18-crown-6 in THF. The crystal structures of the reduced representatives were obtained and their optoelectronic properties were evaluated. The charge of these 4n-Hückel systems leads to dianionic 4n+2 π-electron systems with enhanced antiaromaticity according to NICS(1.7)ZZ calculations, which exhibit unusually red-shifted absorption spectra' . Please return only a json list of at most 3 Keywords corresponding to the Description:.
The data set includes the NMR data for the puplication: 'The Radical Anion and Dianion of Benzo[3,4]cyclobuta[1,2-b]phenazine'.We present the reduction of two azaarenes, featuring a single cyclobutadiene unit, to their radical anions and dianions. The reduced species were prepared with potassium naphthalenide in the presence of 18-crown-6 in THF. The crystal structures of the reduced representatives were obtained and their optoelectronic properties were evaluated. The charge of these 4n-Hückel systems leads to dianionic 4n+2 π-electron systems with enhanced antiaromaticity according to NICS(1.7)ZZ calculations, which exhibit unusually red-shifted absorption spectra
azaacene; biphenylene; dianion