Ruthenium Complexes with Hydrophobic Ligands That Are Key Factors for the Optical Imaging of Physiological Hypoxia. - Komatsu, Hirokazu; Yoshihara, Kazuki; Yamada, Hisatsugu; Kimura, Yu; Son, Aoi; Nishimoto, Sei‐ichi; Tanabe, Kazuhito (Chemistry - A European Journal, 2013)