Chalcone-Analogue Dyes Emitting in the Near-Infrared (NIR): Influence of Donor−Acceptor Substitution and Cation Complexation on Their Spectroscopic Properties and X-ray StructureKnut Rurack, Ute Resch‐Genger, J.L. Bricks et al.|The Journal of Physical Chemistry A|2000Cited by 158