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The ligand will now have a centroid dummy atom added. Draw bonds as desired to the attachment sites.
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The ligand can either be copied to the clipboard to insert via the Clipboard ligand type, or saved as CJSON to contribute to the [fragment repository](https://github.com/openchemistry/fragments)
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@@ -76,22 +76,22 @@ Haptic ligands indicate bonding between a metal center and a delocalized pi syst
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As an example, we will build up an η4-cyclooctatetraene ligand. Either draw the molecule or use File ⇒ Import ⇒ Download by Name… to insert the basic molecule.
Now select the four atoms to use for the haptic ligand:
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Now use the "Add Centroid" command to add a dummy atom at the centroid of the selected atoms. This is useful to create distinct hapticity (e.g., η3 cyclopentadienyl after selecting three carbon atoms instead of five):
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For a haptic ligand, we need one more dummy atom, perpendicular to the pi system. We can add an additional dummy atom **perpendicular** to the centroid:
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After adding the perpendicular attachment, draw a bond between the centroid and the attachment site.
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You can either save this file as CJSON to contribute to the repository, or "Select None" to deselect all atoms and copy the ligand to insert into a new molecule.
Copy file name to clipboardexpand all lines: docs/tools/template-tool.html
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@@ -547,26 +547,26 @@ <h2>Creating New Ligands<a class="headerlink" href="#creating-new-ligands" title
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<p>While the ligand library includes many common ligands, you may wish to create your own or tweak a ligand before attachment.</p>
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<p>As an example, we will build the salen ligand and add the attachment point for this tetradentate ligand. The process is similar for other ligands – Avogadro will use the location of a dummy atom (element zero) to determine where to attach to a metal or molecule.</p>
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<p>After creating your ligand molecule, you should select the atoms which will be the attachement sites:</p>
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<p><imgalt="salen molecule with four selected atoms: two oxygen and two nitrogen" src="static/Ligand-SelectAtoms.png" /></p>
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<p><imgalt="salen molecule with four selected atoms: two oxygen and two nitrogen" src="../../_images/Ligand-SelectAtoms.png" /></p>
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<p>The Build ⇒ Add Centroid command will add a dummy atom at the center of the selected atoms:</p>
<p>The ligand will now have a centroid dummy atom added. Draw bonds as desired to the attachment sites.</p>
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<p><imgalt="salen ligand with four selected atoms and new centroid dummy atom" src="static/Ligand-AddCentroid.png" /></p>
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<p><imgalt="salen ligand with four selected atoms and new centroid dummy atom" src="../../_images/Ligand-AddCentroid.png" /></p>
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<p>The ligand can either be copied to the clipboard to insert via the Clipboard ligand type, or saved as CJSON to contribute to the <aclass="reference external" href="https://github.com/openchemistry/fragments">fragment repository</a></p>
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</section>
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<sectionid="creating-new-haptic-ligands">
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<h2>Creating New Haptic Ligands<aclass="headerlink" href="#creating-new-haptic-ligands" title="Link to this heading">#</a></h2>
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<p>Haptic ligands indicate bonding between a metal center and a delocalized pi system, such as an aromatic ligand.</p>
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<p>As an example, we will build up an η4-cyclooctatetraene ligand. Either draw the molecule or use File ⇒ Import ⇒ Download by Name… to insert the basic molecule.</p>
<p>Now select the four atoms to use for the haptic ligand:</p>
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<p><imgalt="cyclooctatetraene molecule indicating four selected carbon atoms" src="static/Template-COD2.png" /></p>
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<p><imgalt="cyclooctatetraene molecule indicating four selected carbon atoms" src="../../_images/Template-COD2.png" /></p>
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<p>Now use the “Add Centroid” command to add a dummy atom at the centroid of the selected atoms. This is useful to create distinct hapticity (e.g., η3 cyclopentadienyl after selecting three carbon atoms instead of five):</p>
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<p><imgalt="cyclooctatetraene molecule indicating four selected carbon atoms and dummy attachment point" src="static/Template-COD3.png" /></p>
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<p><imgalt="cyclooctatetraene molecule indicating four selected carbon atoms and dummy attachment point" src="../../_images/Template-COD3.png" /></p>
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<p>For a haptic ligand, we need one more dummy atom, perpendicular to the pi system. We can add an additional dummy atom <strong>perpendicular</strong> to the centroid:</p>
<p>You can either save this file as CJSON to contribute to the repository, or “Select None” to deselect all atoms and copy the ligand to insert into a new molecule.</p>
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