Bis(2-amino-thia-zole-4-acetato)aquazinc(II).
Summary
This study details the crystal structure of a novel zinc compound, [Zn(C(5)H(5)N(2)O(2)S)(2)(H(2)O)]. The zinc ion is five-coordinated, forming a distorted square-pyramidal geometry stabilized by hydrogen bonds into a 3D framework.
Area of Science:
- Coordination Chemistry
- Crystal Engineering
- Materials Science
Background:
- Understanding metal-ligand interactions is crucial for designing new materials.
- The coordination chemistry of zinc ions with heterocyclic ligands offers diverse structural possibilities.
- Crystal structure analysis provides fundamental insights into molecular assembly and bonding.
Purpose of the Study:
- To synthesize and characterize a novel zinc coordination compound.
- To elucidate the coordination geometry and bonding of the zinc center.
- To investigate the intermolecular interactions driving crystal packing.
Main Methods:
- Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
- The coordination environment around the central zinc atom was analyzed.
- Intermolecular hydrogen bonding networks were identified and characterized.
Main Results:
- The title compound, [Zn(C(5)H(5)N(2)O(2)S)(2)(H(2)O)], features a central zinc atom with five-coordinate geometry.
- The coordination is achieved through two nitrogen atoms and three oxygen atoms from two 2-amino-thiazole-4-acetate ligands and one water molecule.
- The geometry around the zinc atom is a distorted square pyramid.
- Intermolecular O-H⋯O and N-H⋯O hydrogen bonds link the molecules into an infinite three-dimensional framework.
Conclusions:
- The synthesized zinc complex exhibits a unique distorted square-pyramidal coordination geometry.
- The crystal structure is stabilized by a robust three-dimensional network of intermolecular hydrogen bonds.
- This study contributes to the understanding of zinc coordination chemistry and crystal engineering principles.
Related Concept Videos
Diazonium Group Substitution: –OH and –H
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
Acid Halides to Amides: Aminolysis
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
Amines to Amides: Acylation of Amines
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
Basicity of Heterocyclic Aromatic Amines
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
Antiviral Nucleoside Inhibitors
Antiviral Nucleoside InhibitorsAntiviral nucleoside inhibitors are structural analogs of natural nucleosides that interfere with viral DNA or RNA synthesis. These compounds selectively target viral polymerases due to their resemblance to host nucleosides, thereby disrupting viral genome replication.Mechanism of Acyclovir ActionAcyclovir is a guanosine analog with a three-carbon acyclic side chain. It selectively targets herpes simplex virus type 1 (HSV-1), herpes simplex virus type 2 (HSV-2),...


