By replacing the nitrogen donor of a Tp ligand atoms with sulfur atoms, a class of ligands known as Tm can be made. These are related to the thioureas.¹; Several research groups including Anthony F. Hill's group have been working on this ligand class. To form NaTm {Na HB(mt)), Methimazole and sodium borohydride are heated together.
Coordination chemistry with ruthenium, rhodium, osmium, molybdenum, tungsten, and other metals has been reported.