The syntheses, crystal structures and optical limiting effects of transition metal adducts bridged by bipyridyl-based ligands

Reactions of HgI2 and MnCl2 with N,N′-bis(3-pyridylmethyl)thiourea (bpt) give two adducts [HgI2(bpt)]21 and [MnCl2(bpt)2]n · 2CH3OH 2. 1 is a binuclear metallocyclic compound; 2 possesses regular 1-D double chain structure with bridging bpt ligands. Their optical limiting threshold was determined to be 1.0 and 0.7 J cm−2, which is comparable to those of many heterothiometallates.