Uracilato and 5-halouracilato complexes of Cu(II), Zn(II) and Ni(II). X-ray structures of [Cu(uracilato-N1)2(NH3)2]·2(H2O), [Cu(5-chlorouracilato-N1)2(NH3)2](H2O)2, [Ni(5-chlorouracilato-N1)2(en)2]·2H2O and [Zn(5-chlorouracilato-N1)(NH3)3]·(5-chlorouracilato-N1)·(H2O)

Nickel(II) complexes of 5-phenyl and 5-furan-1,3,4-oxadiazole-2-thiones containing ethylenediamine: synthesis, spectral and X-ray characterization

“…The geometry and bonding parameters within the en ligands agree with those of related compounds, such as trans [Ni [(L) 2 (en) 2 ] {L = N-(5-chlorouracilato)} [26], isothiocyanato [27], and salicylato [28]. (Table 4) is close to the distance reported for other N-HÁÁÁS hydrogen bonds [7].…”

Synthesis and crystal structure of copper (II) uracil ternary polymeric complex with 1,10-phenanthroline along with the Hirshfeld surface analysis of the metal binding sites for the uracil ligand

“…The copper centers exhibit distorted square pyramidal [4 + 1] geometry (s = 0.32 for 1a and 0.34 for 1b). The distances between the uracil nitrogen atoms N1and N3 with Cu1 are <2.004(6) Å>, while the 1,10-phenanthroline copper distances are <2.038(6) Å> which are in agreement with reported copper uracil distances [16,17].…”

“…The Uracil ligand in the reported copper complexes [16,17] [Cu(uracilato-N1) 2 (NH 3 ) 2 ]Á2(H 2 O) (3) and [Cu(tren)(uracilato-N1)]ÁClO 4 Á0.5H 2 O (4) have N3 nitrogen atom free, guiding the self-recognition to the other uracil ligands through complementary NAHÁ Á ÁO hydrogen bonds. The comparison of the Hirshfeld surfaces of the uracil ligand in 3 and 4 with 1a and 1b may throw light on these interactions (Fig.…”

“…Various copper uracil complexes have been characterized by Infrared spectra, elemental analysis [13,14] and theoretical studies in gas phase [12,15] but so far only two crystallographic reports are available for the direct copper uracil interaction. In both cases uracil acts as a monodentate ligand coordinating via nitrogen atom N1 [16,17].…”

Mn(II), Ni(II), Cu(II), Zn(II), Cd(II), Hg(II) and Co(II) complexes of 1-phenyl-1H-tetrazole-5-thiol: Synthesis, spectral, structural characterization and thermal studies

“…N-HÁ Á ÁS intramolecular interactions occur between the thione sulfur atom of tetrazole and NH 2 hydrogen atoms of the en ligand. The geometry and bonding parameters within the en ligand agree with those of other en complexes [20][21][22]. The metal nitrogen distances are 2.116 (9) [23] which indicates that the exocyclic sulfur has double bond character and the ligand is present in the thione form.…”