Hydrated and anhydrous cobalt (II) barbiturates: Crystal structures, spectroscopic and thermal properties

Crystal structures of [Cu2(2,2′-bipyridine-N,N′)2(H2O)2(μ2-OH)2](barbiturate)2·2H2O and [Cu(2,2′-bipyridine-N,N′)(H2O)(barbiturate-O)Cl]·2H2O

“…As in the main bond lengths and valence angles of Hbaand Bipy in 2 practically coincide with those found earlier in other related compounds [13]. All the C-O distances in 1 and 2(Table 2S)are larger than those in free H 2 ba[32], indicating the charge delocalization in the Hbaion, as in the case of other barbiturate complexes[2][3][4][5][6][7][8][9][10][11][12]. The higher d(O3B-C6B ) = 1.2834 (17) Å value as compared with the smaller d(O1B-C2B ) = 1.2393 (18) Å and d(O2B-C4B ) = 1.2567(19) Å values can be explained by the coordination of the ligand Hba  to copper(II) via an O3B atom.…”

“…This work is part of our continuing efforts to study metal barbiturate chemistry from a synthetic and structural point of view [5,8,9]. Two novel mixed-ligand Cu(II) complexes containing the (Fig.…”

“…However, the crystal structure of the barbiturate complexes with metal ions has been the subject of only few reports [2][3][4][5][6][7][8][9][10][11][12]. Another well-known ligand in supramolecular chemistry is 2,2'bipyridine (Bipy).…”

Explorations of Second-Order Nonlinear Optical Materials in the Alkaline Earth Barbiturate System: Noncentrosymmetric Ca(H3C4N2O3)2·H2O and Centrosymmetric Sr(H5C8N4O5)2·4H2O

“…The weight loss in the first stage of CBA and SBA occurred at 100–250 °C and 90–270 °C with the weight loss ratios 5.54% (calcd 5.77%) and 11.8% (calcd 11.36%), respectively, indicating the release of crystalline water. The next step of weight loss starts from 400 °C, which can be considered as the decomposition of the remaining organic components in the form of NO, H 2 O, and CO 2 …”

“…The next step of weight loss starts from 400 °C, which can be considered as the decomposition of the remaining organic components in the form of NO, H 2 O, and CO 2 . 39 Optical Properties. The optical diffuse reflectance spectra of CBA and SBA are revealed in Figures S9 and S10.…”