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Properties of Transition Metals02:58

Properties of Transition Metals

30.1K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
31.0K
Phase Transitions02:31

Phase Transitions

23.3K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.5K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.7K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Quantifying interactions between G-quadruplex DNA and transition-metal complexes.

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Summary

Small molecules targeting guanine quadruplexes (GQs) offer a novel anticancer strategy by inhibiting telomerase. Phenanthroimidazole platinum (II) and metallosupramolecular complexes show tunable binding to GQs.

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Area of Science:

  • Medicinal Chemistry
  • Biochemistry
  • Molecular Biology

Background:

  • Telomerase is a key target in cancer therapy as it is active in cancer cells but not normal cells.
  • Guanine quadruplexes (GQs) are secondary structures in guanine-rich DNA regions, like telomeres, and can be targeted by small molecules.
  • Small molecule binding to GQs can sequester telomeres, inhibiting telomerase activity.

Purpose of the Study:

  • To explore small-molecule transition-metal complexes as anticancer agents by targeting GQs.
  • To investigate the tunability of binding affinity and selectivity of platinum (II) complexes for GQs.
  • To develop novel strategies for telomerase inhibition.

Main Methods:

  • Synthesis and characterization of phenanthroimidazole platinum (II) complexes and metallosupramolecular complexes.
  • Biophysical techniques to assay binding affinity and selectivity towards GQs.
  • Evaluation of small molecules for their ability to sequester telomeres.

Main Results:

  • Phenanthroimidazole platinum (II) complexes and metallosupramolecular complexes demonstrate binding to GQs.
  • The size of the pi-surface, binding selectivity, and affinity of these complexes to GQs can be tuned.
  • These platinum complexes show potential for telomerase inhibition via GQ sequestration.

Conclusions:

  • Transition-metal complexes, particularly platinum (II) based ones, are promising scaffolds for developing GQ-targeting anticancer drugs.
  • The modular synthesis approach allows for fine-tuning of drug properties for optimal efficacy.
  • This research provides a foundation for developing novel small-molecule inhibitors of telomerase.