The dinuclear title compound, [Ag2(C14H22N4O2)(C18H15P)2(H2O)2](NO3)2, lies across an inversion center and consists of two [Ag(H2O)(PPh3)] units bridged by a bis­(cyclo­hexa­none)oxalydihydrazone ligand. The charge-balance is supplied by two nitrate anions. The symmetry-unique AgI ion is in a distorted tetra­hedral geometry coordinated by a P atom from a tri­phenyl­phosphane ligand, an O atom from a water mol­ecule and a bis­(cyclo­hexa­none)oxalydihydrazone ligand bidentate chelating through the O atom and one of N atoms. In the crystal, O—H⋯O and N—H⋯O hydrogen bonds link the components, forming chains along the b-axis direction. These chains are connected through weak C—H⋯O hydrogen bonds, leading to the formation of a two-dimensional supra­molecular network parallel to (001).

The mononuclear title complex contains a chloride, a 1-(4-nitro­phen­yl)thio­urea and two tri­phenyl­phosphane ligands, leading to a tetra­hedrally arranged ClP2S coordination set. N—H⋯Cl and C—H⋯O hydrogen bonds connect the mol­ecules into a three-dimensional network.

The title complex, [Ag3I2(C25H22P2)3]I·C7H8N2S, comprises a trinuclear [Ag3I2(C25H22P2)3]+ unit, an I− anion and one N,N′-phenyl­thio­urea mol­ecule (ptu). Two μ3-bridging I− anions are linked by three AgI ions, leading to the formation of a dicapped triangular motif with Ag⋯Ag separations in the range 3.0823 (5)–3.2999 (5) Å. Each AgI atom exhibits a distorted tetra­hedral geometry, with coordination to two I atoms and two P atoms from bis­(di­phenyl­phosphan­yl)methane ligands. In the crystal, the I− anion is linked to the ptu mol­ecule through two N—H⋯I hydrogen bonds [graph-set motif R 2 1(6)]. These N—H⋯I hydrogen bonds, in addition to weak C—H⋯S and C—H⋯I hydrogen bonds, form zigzag chains along [010]. Two of the phenyl rings of two dppm ligands are disordered over two sets of sites with refined occupancies of 0.557 (16) and 0.443 (16).

Two metal(I) complexes containing triphenylphosphine (PPh 3 ) and 1-(4-nitrophenyl)thiourea (NPTU) ligands were prepared, namely, [MBr(NPTU)(PPh 3 ) 2 ] (M = Cu (1) and Ag (2)). Both compounds (1) and (2) exhibit a distorted tetrahedral metal coordination environment with two P atoms from two PPh 3 ligands, one terminal S atom from the NPTU ligand and a bromide ion. An intramolecular N−H · · · Br hydrogen bond is observed (graph set motif S(6)). Amine and bromide units from neighbouring molecules are linked via bifurcated (N−H) 2 · · · Br hydrogen bonds forming 1D zigzag chains along [001] with an R 2 1 (6) graph set motif. Neighbouring chains are connected through C−H · · · O hydrogen bonds leading to the formation of a three-dimensional network.

There are a large variety of factors that affect the amount of the metal of interest in the seedlings. Surely, the first is the types and states of the metal itself. This includes different types of oxidation states due to the fact that most metals, in particular transition metals, have various oxidation numbers which of course exhibits a wide range of behaviors and toxicity. Furthermore, accompanying anions also have subtle influence on the metal concentrations in rice seedlings, mainly due to the uptake mechanisms. The next parameters should involve rice growing conditions covering periods of time, in other words, the number of days of growing, the types of nutrients or fertilizers, the methods of growing, species of rice or even the weather and environment conditions. These sophisticated parameters make the studies of