Related Experiment Video
Updated: Jun 1, 2026
16:11
Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
Hexa-kis-(thio-urea-κS)nickel(II) nitrate: a redetermination
Summary
This study precisely details the crystal structure of a nickel-thiourea complex, confirming previous findings. It reveals the central nickel atom is octahedrally coordinated by six sulfur-bound thiourea molecules.
Area of Science:
- Inorganic Chemistry
- Crystallography
- Materials Science
Background:
- Previous X-ray studies on [Ni(CH4N2S)6](NO3)2 were conducted using film methods.
- Limited precision and lack of hydrogen atom localization in prior research.
Purpose of the Study:
- To precisely determine the crystal structure of the molecular salt [Ni(CH4N2S)6](NO3)2.
- To locate all hydrogen atoms and refine structural parameters to modern standards.
Main Methods:
- Single-crystal X-ray diffraction.
- Analysis of diffraction data to determine atomic positions and bonding.
Main Results:
- Confirmation of previously reported crystal structure of [Ni(CH4N2S)6](NO3)2.
- Precise determination of atomic coordinates, including all hydrogen atoms.
- Identification of octahedral coordination of the central Ni atom by six sulfur-bound thiourea molecules.
Conclusions:
- The crystal structure was elucidated to high precision, confirming prior work.
- Intra- and inter-molecular hydrogen bonds (N-H⋯S and N-H⋯O) stabilize the crystal structure.
- Provides a detailed structural basis for understanding the properties of this nickel-thiourea complex.
More Related Videos
Related Concept Videos
01:26Redox Titration: Other Oxidizing and Reducing Agents
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
02:34Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
01:202° Amines to N-Nitrosamines: Reaction with NaNO2
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
01:03Precipitation Gravimetry
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
02:57Coordination Number and Geometry
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
01:21Redox Titration: Overview
Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...