摘要 |
Described herein are metal complexes having the formula wherein M is nickel, palladium, or platinum; Q<SUP>1</SUP>-Q<SUP>4 </SUP>are each independently sulfur, selenium, or tellurium; X<SUP>1</SUP>-X<SUP>4 </SUP>are each independently a divalent linking group having 1 to about 125 carbons; m1 to m4 are each independently 0 or 1; and W<SUP>1</SUP>-W<SUP>4 </SUP>are each independently hydrogen, carboxylic acid, carboxylic acid anhydride, carboxylic acid chloride, sulfonic acid, or sulfonyl chloride, with the proviso that W<SUP>1</SUP>-W<SUP>4 </SUP>are not all hydrogen. The complexes have strong absorptions in the near infrared.
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