TY - JOUR
T1 - Synthesis, characterization and oscillator-vibrated near-infrared (NIR) luminescence of two pseudo-polymorphic [Yb4((OH)2-Salophen)4] complexes
AU - Zhang, Zhao
AU - Feng, Heini
AU - Liu, Lin
AU - Feng, Weixu
AU - Yu, Chao
AU - Lü, Xingqiang
AU - WONG, Rick W K
AU - Jones, Richard A.
N1 - Funding Information:
This work is funded by the National Natural Science Foundation ( 21373160 , 91222201 , 21173165 ), the Program for New Century Excellent Talents in University from the Ministry of Education of China ( NCET-10-0936 ), the Doctoral Program ( 20116101110003 ) of Higher Education, the Education Committee Foundation ( 11JK0588 ), the Science, Technology and Innovation Project ( 2012KTCQ01-37 ) of Shaanxi Province and Hong Kong Research Grants Council ( HKBU 202407 and FRG/06-07/II-16 ) in P.R. of China, the Robert A. Welch Foundation (Grant F-816 ), the Texas Higher Education Coordinating Board ( ARP 003658-0010-2006 ), and the Petroleum Research Fund, administered by the American Chemical Society ( 47014-AC5 ).
PY - 2015/5/5
Y1 - 2015/5/5
N2 - Through the self-assembly of the (OH)2-Salophen H4L (H4L = N,N′-bis(3-hydroxylsalicylidene)benzene-1,2-diamine) with LnCl3·6H2O or Ln(NO3)3·6H2O (Ln = La, Yb or Gd) in different solvent systems MeCN-EtOH and MeCN-DMF, the mixed (L)4- and (H2L)2- coordination modes induce the formation of anion-independent while pseudo-polymorphic homoleptic linear tetranuclear complexes [Ln4(H2L)2(L)2(EtOH)2] (Ln = La, 1; Ln = Yb, 2 or Ln = Gd, 3) and [Ln4(H2L)2(L)2(DMF)2] (Ln = La, 4; Ln = Yb, 5 or Ln = Gd, 6), respectively. The result of their photophysical properties shows the characteristic NIR luminescence for both Yb3+-based complexes 2 and 5 with emissive lifetimes in microsecond ranges, while the difference of nearby and/or distant oscillator-based (OH and/or CH) vibrations from two coordinated EtOH or DMF molecules within the inner coordination spheres of Yb3+ ions in the two complexes has a decisive effect on their NIR luminescent properties.
AB - Through the self-assembly of the (OH)2-Salophen H4L (H4L = N,N′-bis(3-hydroxylsalicylidene)benzene-1,2-diamine) with LnCl3·6H2O or Ln(NO3)3·6H2O (Ln = La, Yb or Gd) in different solvent systems MeCN-EtOH and MeCN-DMF, the mixed (L)4- and (H2L)2- coordination modes induce the formation of anion-independent while pseudo-polymorphic homoleptic linear tetranuclear complexes [Ln4(H2L)2(L)2(EtOH)2] (Ln = La, 1; Ln = Yb, 2 or Ln = Gd, 3) and [Ln4(H2L)2(L)2(DMF)2] (Ln = La, 4; Ln = Yb, 5 or Ln = Gd, 6), respectively. The result of their photophysical properties shows the characteristic NIR luminescence for both Yb3+-based complexes 2 and 5 with emissive lifetimes in microsecond ranges, while the difference of nearby and/or distant oscillator-based (OH and/or CH) vibrations from two coordinated EtOH or DMF molecules within the inner coordination spheres of Yb3+ ions in the two complexes has a decisive effect on their NIR luminescent properties.
KW - Oscillator-vibrated NIR luminescence
KW - Pseudo-polymorphism
KW - Tetranuclear [Ln((OH)-Salophen)]-arrayed complexes
UR - http://www.scopus.com/inward/record.url?scp=84923256782&partnerID=8YFLogxK
U2 - 10.1016/j.saa.2015.01.082
DO - 10.1016/j.saa.2015.01.082
M3 - Journal article
C2 - 25703363
AN - SCOPUS:84923256782
SN - 1386-1425
VL - 142
SP - 188
EP - 195
JO - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
JF - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
ER -