@article{61ddf033b4aa41438c3d34ef2a5b00fc,
title = "Abrupt spin transition in a modified-terpyridine cobalt(ii) complex with a highly-distorted [CoN6] core",
abstract = "The cobalt(ii) complex incorporating π-conjugated substituent, [Co(Naph-C2-terpy)2](BF4)2 (1; Naph-C2-terpy = 4′-(2-naphthoxy(ethoxy))-2,2′:6′,2′′-terpyridine), exhibits an abrupt spin transition (ST) behavior (cooperative factor C = 0.91) while its solvated product, 1·2MeOH, shows gradual spin crossover (SCO) behavior (C = 0.49). Single crystal X-ray structural analyses demonstrated that the octahedral coordination core [CoN6] in 1 shows larger distortion in both high-spin and low-spin states than solvated 1·2MeOH or another two derivatives, [Co(R-terpy)2](BF4)2 (R = 2-naphthyl (2), 9-anthracenyl (3)). The respective distortion parameters (Σ) are compared with those for previously reported SCO cobalt(ii) compounds. The highly-distorted [CoN6] core in 1 (Σ = 126 in the HS state and 101.6 in the LS state) was stabilized by strong intermolecular interactions and observed an abrupt ST behaviour.",
author = "Manabu Nakaya and Ryo Ohtani and Shin, {Jong Won} and Masaaki Nakamura and Lindoy, {Leonard F.} and Shinya Hayami",
note = "Funding Information: This work was supported by KAKENHI Grant-in-Aid for Scientific Research (A) JP17H01200. M. N. is grateful to JSPS Research Fellowships for Young Scientists (No. JP15J11333). This work was supported by JSPS Grant-in-Aid for Young Scientists (B) JP15K17833 and JSPS Grant-in-Aid for Scientific Research on Innovative Areas (Dynamical Ordering & Integrated Functions JP16H00777, Mixed Anion JP17H05485). This work was supported by the Cooperative Research Program of {\textquoteleft}Network Joint Research Centre for Materials and Devices{\textquoteright}. Funding Information: This work was supported by KAKENHI Grant-in-Aid for Scientific Research (A) JP17H01200. M. N. is grateful to JSPS Research Fellowships for Young Scientists (No. JP15J11333). This work was supported by JSPS Grant-in-Aid for Young Scientists (B) JP15K17833 and JSPS Grant-in-Aid for Scientific Research on Innovative Areas (Dynamical Ordering & Integrated Functions JP16H00777, Mixed Anion JP17H05485). This work was supported by the Cooperative Research Program of 'Network Joint Research Centre for Materials and Devices'.",
year = "2018",
doi = "10.1039/c8dt02367k",
language = "English",
volume = "47",
pages = "13809--13814",
journal = "Dalton Transactions",
issn = "1477-9226",
publisher = "Royal Society of Chemistry",
number = "39",
}