TY - JOUR
T1 - Rhodamine 6G-Labeled Pyridyl Aroylhydrazone Fe(II) Complex Exhibiting Synergetic Spin Crossover and Fluorescence
AU - Yuan, Juan
AU - Wu, Shu Qi
AU - Liu, Mei Jiao
AU - Sato, Osamu
AU - Kou, Hui Zhong
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Project Nos. 21571113 and 21771115 to H.-Z.K., J.Y., and M.-J.L.), the 973 program (2013CB933403 to H.-Z.K.), and MEXT KAKENHI (Grant No. 17H01197 to O.S.). We thank Prof. Yoshihito Shiota for help with the theoretical calculations. S.-Q.W. thanks the China Scholarship Council for support. This paper is dedicated to Prof. Dai-Zheng Liao on the occasion of his 80th birthday.
PY - 2018/8/1
Y1 - 2018/8/1
N2 - Here, we use a pyridinecarbaldehyde rhodamine 6G hydrazone ligand (L) to synthesize an Fe(II) complex 1 for the search of new fluorescent-spin crossover (SCO) materials. Single-crystal structural determinations suggest that the Fe(II) ion is chelated by two ring-opened ligands (L-o) to form a FeN4O2 coordination environment, and intermolecular π - -π contacts of the xanthene groups connect the adjacent molecules to form a supramolecular one-dimensional chain. Magnetic susceptibility measurements on complex 1 show that three-step SCO takes place in the temperature range of 120-350 K, and its desolvated form 1-d exhibits SCO around room temperature (Tc↑ = 343 K and Tc↓ = 303 K) with a wide hysteresis loop of 40 K. Moreover, complex 1-d displays light-induced excited spin-state trapping phenomenon. Intriguingly, the fluorescence intensity of the maximum emission at 560 nm for complex 1-d displays discontinuous variation in the range of 250-400 K, indicative of the occurrence of synergetic fluorescence and SCO.
AB - Here, we use a pyridinecarbaldehyde rhodamine 6G hydrazone ligand (L) to synthesize an Fe(II) complex 1 for the search of new fluorescent-spin crossover (SCO) materials. Single-crystal structural determinations suggest that the Fe(II) ion is chelated by two ring-opened ligands (L-o) to form a FeN4O2 coordination environment, and intermolecular π - -π contacts of the xanthene groups connect the adjacent molecules to form a supramolecular one-dimensional chain. Magnetic susceptibility measurements on complex 1 show that three-step SCO takes place in the temperature range of 120-350 K, and its desolvated form 1-d exhibits SCO around room temperature (Tc↑ = 343 K and Tc↓ = 303 K) with a wide hysteresis loop of 40 K. Moreover, complex 1-d displays light-induced excited spin-state trapping phenomenon. Intriguingly, the fluorescence intensity of the maximum emission at 560 nm for complex 1-d displays discontinuous variation in the range of 250-400 K, indicative of the occurrence of synergetic fluorescence and SCO.
UR - http://www.scopus.com/inward/record.url?scp=85049859541&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85049859541&partnerID=8YFLogxK
U2 - 10.1021/jacs.8b00103
DO - 10.1021/jacs.8b00103
M3 - Article
C2 - 29983062
AN - SCOPUS:85049859541
VL - 140
SP - 9426
EP - 9433
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 30
ER -