Abstract The synthesis and crystal structure of co-crystal between bis(dithiobiureto)platinum(II) ([Pt(dtb) 2 ]) with thymine is reported. The crystalline structure of [Pt(dtb) 2 ](thymine) 2 shows two-dimensional arrays created by hydrogen-bonding interactions. One mononuclear complex and two thymine molecules form a building unit connected by triple hydrogen bond employing ADA–DAD arrangements (A