Coordination compound of silver (I) nitrate and ethylenethiourea (etu) in 1 : 4 stochiometry have been reported [1]. Coordination compound A and B being silver (I) nitrite with etu and silver(I) nitrite with N,N'-diethylthiourea (detu) respectively, have never been done. The purpose of this study is to synthesize and characterize coordination compounds A and B. Synthesis of coordination compounds A with 1 : 4 and B with 1 : 2 ratio stoichiometry respectively. Both of synthesis was conducted in acetonitrile directly. The obtained compound characterized by using melting point, electrical conductivity measurement, Scanning Electron Microscopy Energy-dispersive X-ray spectroscopy (SEM-EDX), qualitative nitrite test, free energy calculation and structures prediction using Spartan'14 v1.1.0. Coordination compounds of A and B have been investigated that it had colorless needle and prism crystals, having the melting point of 189°C and 103-105°C, free energy of -289.2567 and -1182.8101 kJ/mol respectively. Electrical conductivity measurement and qualitative nitrite test showed that the obtained compound for A is ionic and for B is molecular. EDX analysis gave empirical formula prediction for two coordination compounds, where A is C 12 H 24 AgN 9 O 2 S 4 and for B is C 15 H 36 AgN 7 O 2 S 3 .