Structure of tetrakis(thiourea)zinc(II) nitrate

New Complexes with a Sterically Hindered Thiourea: Syntheses and Crystal Structures of [Co(dchtu)2Cl2], [Zn(dchtu)2(NCS)2] and [Pb(dchtu)6](SCN)2·2C2H5OH (dchtu = N,N′‐dicyclohexylthiourea)

“…Due to the sterical bulk of the cyclohexyl rings, the SϪZnϪS angle (112.57(7)°) is much larger than the corresponding angle observed in Zinc(II) complex with thiourea, [Zn(tu) 2 Cl 2 ] (SϪZnϪS: 98.40(3)°) [28]. The ZnϪS (2.3311(12) Å ) and ZnϪN (1.995(4) Å ) bond distances are consistent with those observed in literatures for similar zinc(II) thiourea complexes [20,28,29]. In 3, the sulfur atoms of isothiocyanate ions acts as hydrogen bonding acceptors, forming two equivalent NϪH···S weak hydrogen bonds with neighbor molecules [N(1)···S(2) ϭ 3.721(4) Å ] ( Table 2).…”

“…Using three-fold molar excesses of dchtu in the reactions also give rise to the formation of these 1:2 compounds of dchtu. In contrast, these metal thiourea-type complexes form 1:4 compounds, [M(tu) 4 ](NO 3 ) 2 (M ϭ Co, Zn) [19,20], [Ni(tu) 4 ]S 2 O 3 · H 2 O [21] (tu ϭ thiourea) under similar conditions. The sterically hindered nature of dchtu is the most likely explanation for the limited degree of substitution in the valence shell of the metal atoms despite the molar excess ligand.…”

Backbone Flexibility and Counterion Effects on the Structure and Thermal Properties of Di(thiourea)zinc Dicarboxylate Coordination Polymers

“…Infrared spectra were recorded with a Nicolet Nexus FT-IR spectrometer as KBr pellets, and thermogravimetric analyses were carried out with a PerkinϪElmer TGA 7 instrument. [Zn(tu) 4 ]Cl 2 , [25] [Zn(tu) 4 ](NO 3 ) 2 [26] and compounds 1Ϫ6 [14] were prepared as described in the literature. Sodium dicarboxylates were prepared by reaction of the appropriate dicarboxylic acid with either sodium hydroxide or sodium hydrogen carbonate.…”

Zinc-67 NMR study of tetrahedral and octahedral zinc sites with symmetrical oxygen, nitrogen, and sulfur ligands

“…From analysis of the 67 Zn MAS spectrum, we obtained that the 67 Zn NQCC is 3.15 MHz with η = 1. The crystal structure of Zn[SC(NH 2 ) 2 ] 4 (NO 3 ) 2 (space group Pnaa) indicates that the zinc ions are coordinated by four sulfur atoms from the thiourea ligands (18). The two Zn-S distances are 2.324 and 2.361 Å, which are considerably longer than the Zn-N distances in the zinc-imidazole complex.…”