biostudies-literatureZhang XChina Scholarship CouncilU.S. Department of EnergyArgonne National Laboratory, Office of ScienceNational Natural Science Foundation of ChinaWelch FoundationNational Science Foundation1569-1574https://www.ebi.ac.uk/biostudies/studies/S-EPMC5530863biostudies-literatureUnknown7(2)The bifunctional salt [Co(terpy)₂](TCNQ)₃·CH₃CN (terpy = 2,2';6',2''-terpyridine, TCNQ = 7,7,8,8-tetracyanoquino-dimethane) exhibits a high room temperature conductivity of 0.13 S cm^-1 and an anomaly in conductivity at ∼190 K as evidenced by variable temperature structural, magnetic and conductivity studies. The anomaly in the conductivity at 190 K has been correlated with the temperature dependent structural breathing and Jahn-Teller distortion of the low spin state of the SCO units, as well as the charge fluctuations and supramolecular π-stacking interactions of partially charged TCNQ radicals. The modular synthetic approach leads to an accessible source of partially charged TCNQ radicals for the facile preparation of bifunctional molecular matChemical scienceA cobalt(ii) spin-crossover compound with partially charged TCNQ radicals and an anomalous conducting behavior.PMC5530863201206895004DE-AC02-06CH11357A-1449NSF/CHE-1346572DE-SC001258221171115Li MXXie HZhang XWoods TJWang ZXDunbar KRfalseA cobalt(ii) spin-crossover compound with partially charged TCNQ radicals and an anomalous conducting behavior.The bifunctional salt [Co(terpy)₂](TCNQ)₃·CH₃CN (terpy = 2,2';6',2''-terpyridine, TCNQ = 7,7,8,8-tetracyanoquino-dimethane) exhibits a high room temperature conductivity of 0.13 S cm^-1 and an anomaly in conductivity at ∼190 K as evidenced by variable temperature structural, magnetic and conductivity studies. The anomaly in the conductivity at 190 K has been correlated with the temperature dependent structural breathing and Jahn-Teller distortion of the low spin state of the SCO units, as well as the charge fluctuations and supramolecular π-stacking interactions of partially charged TCNQ radicals. The modular synthetic approach leads to an accessible source of partially charged TCNQ radicals for the facile preparation of bifunctional molecular mat2016-01-01T00:00:00Z2016 Feb2025-04-04T08:02:16.993Z2019-03-27T02:51:50ZS-EPMC55308632880853210.1039/c5sc03547c