1,1-vinyl substituted nonlinear optical materials

A nonlinear optical compound of the formula:

• ##STR24## wherein A.sub.1 and A.sub.2 are independently selected from the group consisting of electron withdrawing moieties;
• R.sub.1 and R.sub.2 are independently selected from the group consisting of aromatic rings, heteroaromatic rings and fused ring systems consisting of two or three aromatic or heteroaromatic tings, wherein at least one of R.sub.1 or R.sub.2 is a five-membered heteroaromatic ring or a fused ring system comprising a five-membered heteroaromatic ring;
• n and m are independently integers from one to five, inclusive;
• D.sub.1 and D.sub.2 are independently selected from the group consisting of hydrogen, electron donating groups and polymer attachment groups, with the proviso that at least one of D.sub.1 and D2 is an electron donating group;
• and
• the compound formed by A.sub.1, A.sub.2, D.sub.1, D.sub.2, R.sub.1 and R.sub.2 possesses a delocalized resonance configuration.