scholarly journals Nanocluster Growth and Coalescence Modulated by Ligands

2020 ◽  
Author(s):  
Dylan Suvlu ◽  
Mohsen Farshad ◽  
Jayendran C. Rasaiah
Keyword(s):  
Binding Sites ◽  
Functional Form ◽  
Rate Coefficients ◽  
Ligand Complex ◽  
Surface Sites ◽  
Ligand Adsorption ◽  
Gold Thiolate ◽  
Size Interval ◽  
Growth Pathway ◽  
Metal Ligand

We describe a model of nanocluster formation that incorporates competition between ligand adsorption and nanocluster growth. Growth occurs through the addition of a metal-ligand complex and coalescence of nanoclusters. The competition between ligands for binding sites on the nanoclusters and growth of the nanoclusters through coalescence creates interesting growth pathways. The patterns are reminiscent of those observed in the synthesis of gold thiolate nanoclusters. For a particular set of rate coefficients, described herein, we observe the formation of a kinetically stable nanocluster that participates in coalescent growth. This determines the size interval of the resulting nanoclusters in the size distribution. The kinetically stable cluster can be tuned by modifying the functional form of the number of surface sites on the nanoclusters, thereby changing the growth pathway and the final sizes of the clusters.

scholarly journals Nanocluster Growth and Coalescence Modulated by Ligands

2020 ◽  
Author(s):  
Dylan Suvlu ◽  
Mohsen Farshad ◽  
Jayendran C. Rasaiah
Keyword(s):  
Binding Sites ◽  
Functional Form ◽  
Rate Coefficients ◽  
Ligand Complex ◽  
Surface Sites ◽  
Ligand Adsorption ◽  
Gold Thiolate ◽  
Size Interval ◽  
Growth Pathway ◽  
Metal Ligand

We describe a model of nanocluster formation that incorporates competition between ligand adsorption and nanocluster growth. Growth occurs through the addition of a metal-ligand complex and coalescence of nanoclusters. The competition between ligands for binding sites on the nanoclusters and growth of the nanoclusters through coalescence creates interesting growth pathways. The patterns are reminiscent of those observed in the synthesis of gold thiolate nanoclusters. For a particular set of rate coefficients, described herein, we observe the formation of a kinetically stable nanocluster that participates in coalescent growth. This determines the size interval of the resulting nanoclusters in the size distribution. The kinetically stable cluster can be tuned by modifying the functional form of the number of surface sites on the nanoclusters, thereby changing the growth pathway and the final sizes of the clusters.

scholarly journals Nanocluster Growth and Coalescence Modulated by Ligands

2020 ◽  
Author(s):  
Dylan Suvlu ◽  
Mohsen Farshad ◽  
Jayendran C. Rasaiah
Keyword(s):  
Binding Sites ◽  
Functional Form ◽  
Rate Coefficients ◽  
Ligand Complex ◽  
Surface Sites ◽  
Ligand Adsorption ◽  
Gold Thiolate ◽  
Size Interval ◽  
Growth Pathway ◽  
Metal Ligand

We describe a model of nanocluster formation that incorporates competition between ligand adsorption and nanocluster growth. Growth occurs through the addition of a metal-ligand complex and coalescence of nanoclusters. The competition between ligands for binding sites on the nanoclusters and growth of the nanoclusters through coalescence creates interesting growth pathways. The patterns are reminiscent of those observed in the synthesis of gold thiolate nanoclusters. For a particular set of rate coefficients, described herein, we observe the formation of a kinetically stable nanocluster that participates in coalescent growth. This determines the size interval of the resulting nanoclusters in the size distribution. The kinetically stable cluster can be tuned by modifying the functional form of the number of surface sites on the nanoclusters, thereby changing the growth pathway and the final sizes of the clusters.

scholarly journals Morphology Control of Ni(II)-NTA-End-Functionalized Block Copolymer and Bio-Conjugation through Metal-Ligand Complex

Polymers ◽  
2017 ◽  
Vol 9 (12) ◽  
pp. 144 ◽  
Author(s):  
Dasom Park ◽  
Chaeyeon Lee ◽  
Minsu Chae ◽  
Mohammad Kadir ◽  
Ji Choi ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Morphology Control ◽  
Ligand Complex ◽  
Metal Ligand

Non-linearity with metal-metal ligand complex reactions in flow injection systems. Metal-thiocyanate reactions

1997 ◽  
Vol 350 (1-2) ◽  
pp. 37-50 ◽  
Author(s):  
J.F. van Staden ◽  
C. Saling ◽  
D. Malan ◽  
R.E. Taljaard
Keyword(s):  
Flow Injection ◽  
Ligand Complex ◽  
Metal Metal ◽  
Metal Ligand

scholarly journals Fluorescence Energy Transfer Immunoassay Based on a Long-Lifetime Luminescent Metal–Ligand Complex

1995 ◽  
Vol 232 (1) ◽  
pp. 24-30 ◽  
Author(s):  
Hee Ju Youn ◽  
Ewald Terpetschnig ◽  
Henryk Szmacinski ◽  
Joseph R. Lakowicz
Keyword(s):  
Energy Transfer ◽  
Fluorescence Energy Transfer ◽  
Ligand Complex ◽  
Long Lifetime ◽  
Fluorescence Energy ◽  
Metal Ligand

scholarly journals Solvent manipulation of the pre-reduction metal–ligand complex and particle-ligand binding for controlled synthesis of Pd nanoparticles

Nanoscale ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 206-217
Author(s):  
Wenhui Li ◽  
Michael G. Taylor ◽  
Dylan Bayerl ◽  
Saeed Mozaffari ◽  
Mudit Dixit ◽  
...  
Keyword(s):  
Ligand Binding ◽  
Growth Rates ◽  
Pd Nanoparticles ◽  
Nucleation And Growth ◽  
Controlled Synthesis ◽  
Ligand Complex ◽  
Metal Ligand

Understanding how to control the nucleation and growth rates is crucial for designing nanoparticles with specific sizes and shapes.

A Highly Selective and Sensitive Fluorescent Probe Based on Quinolone Derivative for Hg2+ in Aqueous Solution

2012 ◽  
Vol 549 ◽  
pp. 229-233
Author(s):  
Juan Juan Tian ◽  
Xin Zhou ◽  
Hui Juan Hao ◽  
Xue Wu
Keyword(s):  
Aqueous Solution ◽  
Fluorescent Probe ◽  
Limit Of Detection ◽  
Transition Metal Ions ◽  
Quinoline Derivative ◽  
Ligand Complex ◽  
Quinolone Derivative ◽  
Ph Range ◽  
Metal Ligand ◽  
Tof Ms

A new fluorescent probe, quinoline derivative DPQ bearing a methyl pyrrolidine-1-carbodithioate group, was synthesized and characterized by IR, Tof-MS and NMR. Its fluorescent behaviors toward transition metal ions were investigated. The results indicate that DPQ shows unique selective and high sensitive for Hg2+ in aqueous solution with a broad pH range 4-10. DPQ forms a 1:2 metal-ligand complex with Hg2+ ions with a limit of detection as low as 1.7×10-6 mol/L.

Metal ion – biomolecule interactions. Part 16. C(2)-H isotopic exchange in Co(III)-coordinated imidazoles

1995 ◽  
Vol 73 (6) ◽  
pp. 772-780 ◽  
Author(s):  
Erwin Buncel ◽  
Fan Yang ◽  
Robert Y. Moir ◽  
Ikenna Onyido
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Hydrogen Exchange ◽  
Isotopic Exchange ◽  
Negative Charge ◽  
Ligand Complex ◽  
Transition State Stabilization ◽  
Anionic Species ◽  
Metal Ligand ◽  
Ligand Bond

Transition-metal-bound imidazoles are suitable models for evaluating the roles of metal ions in biomolecules having the imidazole moiety and similar heterocyclic residues as part of their structure. Such studies provide useful insights into metal–biomolecule interactions in biological systems, especially when the lability of the metal–ligand bond is substantially reduced, such that the identity of the metal–ligand complex is preserved during the course of the reaction under investigation. The present paper reports on a kinetic study of tritium exchange from the C(2) position of the imidazole moiety in the substitution-inert complex cations [Co(NH3)5[2-3H]-imidazole]3+ (1) and [Co(NH3)5-1-methyl-[2-3H]-imidazole]3+ (2). Rate–pH profiles have been determined in aqueous solution at 60 °C. Both substrates are believed to react through rate-determining attack of hydroxide ion (kM+ pathway) at C(2)-T. Dissection of the kinetic data reveals an additional pathway for 1 consequent upon deprotonation of its pyrrole-like N-H(T) to yield 3, which is then attacked by hydroxide at C(2) (kM pathway). The ratio kM+/kM = 103 that is obtained is in accord with the expected reduced reactivity of 3. Comparison of the present data with those reported for a variety of heterocyclic substrates shows that the order of reactivity, protonated [Formula: see text] metal ion coordinated [Formula: see text] neutral form of substrates, prevails. The superiority of the proton over metal ions in catalyzing isotopic hydrogen exchange is attributed to its larger ground state acidifying effect coupled with the greater transition state stabilization it affords, relative to metal ions. The exchange reaction of 3 via the kM pathway is the first example of a reactive anionic species in which the negative charge is located α to the exchanging C-H. Keywords: tritium exchange, cobalt (III)-coordinated imidazoles.

Sign in / Sign up

Export Citation Format

Share Document