Syntheses,Characterization and Crystal Structures of Dithiocarbamate-based Mononuclear Palladium(Ⅱ)

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By employing the dithiocarbamate salt(K(PPDC), where PPDC = 4?-pyridyl-1-piperazine-4-dithiocarbamate) as the functional ligand and di-palladium complexes [(N^N)_2Pd_2(NO_3ˉ)_2](NO3ˉ)2(N^N = 2,2?-bipyridine, bpy; 4,4?-dimethylbipyridine, dmbpy) as corner, two novel single metal complexes with Pd(II) centers have been obtained. These organic-metal complexes were characterized by NMR, ESI-MS, elemental analysis, Uv-vis spectra and single-crystal X-ray diffraction analysis. Compound 1·(PF6)2([(bpy)Pd(PPDC)]·(PF6)2) crystallizes in triclinic, space group P1, a = 8.3968(5), b = 11.5565(7), c = 18.2234(11) ?, α = 97.505(1), β = 91.424(1), γ = 106.146(1)o, C22H24N6S2P2F12 Pd, Mr = 832.93, V = 1680.58(18) ?~3, Z = 2, Dc = 1.646 Mg/m3, μ(MoK α) = 0.863 mm-1, F(000) = 828, the final R = 0.0455 and wR = 0.1390 for 6981 observed reflections with I > 2σ(I). Similarly, compound 2·(PF6)2([(dmbpy)Pd(PPDC)]·(PF6)2) also crystallizes in triclinic, space group P1, a = 13.9467(3), b = 14.8390(2), c = 17.0632(3) ?, α = 81.8680(10), β = 87.051(2), γ = 83.4590(10)o, C_(22)H_(25)N_5S_2P_2F_(12)Pd, M_r = 819.93, V = 3470.81(11) ?~3, Z = 4, D_c = 1.569 Mg/m~3, μ(CuK α) = 7.115 mm~(-1), F(000) = 1632, the final R = 0.0606 and w R = 0.1637 for 12835 observed reflections with I > 2σ(I). Crystallography reveals that each metal center coordinates with two N atoms from bpy and two S atoms from PPDC in the square coordination mode. In the crystal structure of complex 1, a weak Pd···Pd interaction can be observed. Interestingly, it was also found that the mononuclear moieties of complex 2 could be packed into a 3-D porous framework via multiple intermolecular C–F···H hydrogen-boding interactions which extended in the a, b, and c axes with PF_6ˉ anions frozen inside. By employing the dithiocarbamate salt (K (PPDC), where PPDC = 4? -pyridyl-1-piperazine-4-dithiocarbamate as the functional ligand and di- palladium complexes [(N ^ N) _2Pd_2 (NO_3ˉ) _2] ) 2 (N ^ N = 2,2? -bipyridine, bpy; 4,4? -dimethylbipyridine, dmbpy) as corner, two novel single metal complexes with Pd (II) centers have been obtained. These organic- Compound 1 · (PF6) 2 ([(bpy) Pd (PPDC)] · (PF6) 2) crystallizes in triclinic , space group P1, a = 8.3968 (5), b = 11.5565 (7), c = 18.2234 (11) ?,? = 97.505 (1),? = 91.424 (1),? = 106.146 (1) o, C22H24N6S2P2F12 Pd = 832.93, V = 1680.58 18 ~ 3, Z = 2, Dc = 1.646 Mg / m3, μ MoK α = 0.863 mm -1, F 000 = 828, the final R = (PF6) 2 ([(dmbpy) Pd (PPDC)] · (PF6) 2) also crystallizes in triclinic, space group P1, and wR = 0.1390 ​​for 6981 observed reflections with I> a = 13.9467 (3), b = 14.8390 ( Α = 81.8680 (10), β = 87.051 (2), γ = 83.4590 (10) o, C_ (22) H_ (25) N_5S_2P_2F_ (12) Pd and M_r = 819.93 , V = 3470.81 (11) ~ 3, Z = 4, D_c = 1.569 Mg / m ~ 3, μ CuK α = 7.115 mm -1, F 000 000 = 1632, the final R = 0.0606 and w R = 0.1637 for 12835 observed reflections with I> 2σ (I). Crystallography reveals that each metal center coordinates with two N atoms from bpy and two S atoms from PPDC in the square coordination mode. In the crystal structure of complex 1, a weak Pd ··· Pd interaction can be observed. Interestingly, it was also found that the mononuclear moieties of complex 2 could be packed into a 3-D porous framework via multiple intermolecular C-F ··· H hydrogen-boding interactions which extended in the a, b, and c axes with PF_6ˉ anions frozen inside.
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