Tris (2,2′-bipyridyl) dichlororuthenium (II) hexahydrate (RU(BPY)3)
Tris (2,2′-bipyridyl) dichlororuthenium (II) hexahydrate (RU(BPY)3) is a metal complex, water-soluble photoinitiator, suitable for its use under visible light wavelengths (> 400 nm, with higher activation at 450 nm). In order to be used as a photoinitiator, it should be combined with Sodium Persulfate (SPS) (sold separately).
It has been utilized to crosslink free tyrosine and acryl groups of collagen type I, gelatin, their methacrylate derivatives, silk fibroin, HAMA, and PEGDA, amongst other biomaterials. It is non-toxic for cells at high concentrations and at visible light intensities of 3-100 mW/cm2.