US 12,215,269 B1
Chiral azobenzene dopants with increased delta helical twisting power
Sogol Lotfi, San Jose, CA (US); Manas Likhit Holekevi Chandrappa, Santa Clara, CA (US); Balachandran Gadaguntla Radhakrishnan, Palo Alto, CA (US); Shigemasa Kuwata, Palo Alto, CA (US); Shunta Nabetani, Kanagawa (JP); Yoshimi Ota, Kanagawa (JP); Masanobu Uchimura, Palo Alto, CA (US); and Simran Kumari, Los Angeles, CA (US)
Assigned to Nissan North America, Inc., Franklin, TN (US)
Filed by Nissan North America, Inc., Franklin, TN (US)
Filed on Jul. 31, 2023, as Appl. No. 18/228,496.
Int. Cl. C09K 19/58 (2006.01); C09B 31/02 (2006.01); C09K 19/02 (2006.01)
CPC C09K 19/586 (2013.01) [C09B 31/025 (2013.01); C09K 19/0208 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A chiral azobenzene dopant with helical twisting power, the chiral dopant having a structure represented by the following formula (I):

OG Complex Work Unit Chemistry
wherein Z and Z′ are independently selected from the group consisting of naphthalene and phenanthrene;
when Z or Z′ is naphthalene, the naphthalene optionally has R3 at the 6 position and R4 at the 6′ position;
when Z or Z′ is phenanthrene, the phenanthrene optionally has R3 at the 7 position and R4 at the 7′ position;
R1, R2, R3, and R4 are independently selected from the group consisting of an alkyl group having 1 to 20 carbons, an alkoxy group having 1 to 20 carbons, an aryl group having 6 to 20 carbons, and an aryloxy group having 6 to 20 carbons; and
on any one or more R1, R2, R3, and R4, a CH3 is optionally attached by replacing a hydrogen of a CH2.