申请人:Spectra Systems Corporation
公开号:US20210324264A1
公开(公告)日:2021-10-21
A chelate and associated security feature including a lanthanide metal and a ligand of formula (1), formula (2), or formula (3),
where each of R
1
-R
7
in formula (1) is independently selected from the group consisting of H, OH, NH
2
, Cl, F, OMe, OAr, OCF
3
, CF
3
, alkyl, aryl, phenyl, OPh, and heteroaromatic, where each of R
1
-R
5
in formula (2) is independently selected from the group consisting of H, OH, NH
2
, Cl, F, OMe, OAr, OCF
3
, CF
3
, NMe
2
, CN, alkyl, aryl, phenyl, OPh, and heteroaromatic, and where R
6
in formula (2) is selected from the group consisting of H, NH
2
, Cl, F, OMe, OAr, OCF
3
, CF
3
, NMe
2
, CN, alkyl, aryl, phenyl, OPh, and heteroaromatic, and where each of R
1
-R
5
in formula (3) is independently selected from the group consisting of H, OH, NH
2
, Cl, F, OMe, OAr, OCF
3
, CF
3
, alkyl, aryl, phenyl, OPh, and heteroaromatic.