{
  "id": 95702,
  "title": "anybody know  why scalar_coupling_constant can be negative？",
  "url": "/competitions/champs-scalar-coupling/discussion/95702",
  "author_name": "Al Chen",
  "post_date": "2019-06-14T08:21:21.232000",
  "votes": 1,
  "comment_count": 2,
  "views": 0,
  "content": "<p>id,molecule_name,atom_index_0,atom_index_1,type,scalar_coupling_constant\n0,dsgdb9nsd_000001,1,0,1JHC,84.8076\n1,dsgdb9nsd_000001,1,2,2JHH,<strong>-11.257</strong></p>",
  "messages": [
    {
      "id": 552625,
      "postDate": "2019-06-14T08:21:21.233Z",
      "content": "<p>id,molecule_name,atom_index_0,atom_index_1,type,scalar_coupling_constant\n0,dsgdb9nsd_000001,1,0,1JHC,84.8076\n1,dsgdb9nsd_000001,1,2,2JHH,<strong>-11.257</strong></p>",
      "rawMarkdown": "id,molecule_name,atom_index_0,atom_index_1,type,scalar_coupling_constant\n0,dsgdb9nsd_000001,1,0,1JHC,84.8076\n1,dsgdb9nsd_000001,1,2,2JHH,**-11.257**",
      "votes": 1
    },
    {
      "id": 552688,
      "postDate": "2019-06-14T10:45:50.390Z",
      "content": "<blockquote>\n  <p>For heteronuclear coupling, the magnitude of <strong>J</strong> is related to the nuclear magnetic moments of the coupling partners. <strong>F</strong>, with a high nuclear magnetic moment, gives rise to large coupling to protons. <strong>Rh</strong>, with a very small nuclear magnetic moment, gives only small couplings to <strong>H</strong>. To correct for the effect of the nuclear magnetic moment (or equivalently the gyromagnetic ratio γ), the \"reduced coupling constant\" <strong>K</strong> is often discussed, where</p>\n</blockquote>\n\n<p><img src=\"https://i.ibb.co/T8wgBML/Capture.jpg\" alt=\"\"></p>\n\n<blockquote>\n  <p><strong>The value of J also has a sign, and couplings constants of comparable magnitude often have opposite signs</strong></p>\n</blockquote>",
      "rawMarkdown": "&gt; For heteronuclear coupling, the magnitude of **J** is related to the nuclear magnetic moments of the coupling partners. **F**, with a high nuclear magnetic moment, gives rise to large coupling to protons. **Rh**, with a very small nuclear magnetic moment, gives only small couplings to **H**. To correct for the effect of the nuclear magnetic moment (or equivalently the gyromagnetic ratio γ), the \"reduced coupling constant\" **K** is often discussed, where\n\n![](https://i.ibb.co/T8wgBML/Capture.jpg)\n\n&gt; **The value of J also has a sign, and couplings constants of comparable magnitude often have opposite signs**",
      "votes": 1,
      "isDeleted": true
    },
    {
      "id": 553044,
      "postDate": "2019-06-15T03:32:35.140Z",
      "content": "<p>thank you , cTatu</p>",
      "rawMarkdown": "thank you , cTatu"
    }
  ],
  "comments": [
    {
      "id": 552688,
      "author_name": "",
      "author_url": "",
      "post_date": "2019-06-14T10:45:50.390000",
      "content": "<blockquote>\n  <p>For heteronuclear coupling, the magnitude of <strong>J</strong> is related to the nuclear magnetic moments of the coupling partners. <strong>F</strong>, with a high nuclear magnetic moment, gives rise to large coupling to protons. <strong>Rh</strong>, with a very small nuclear magnetic moment, gives only small couplings to <strong>H</strong>. To correct for the effect of the nuclear magnetic moment (or equivalently the gyromagnetic ratio γ), the \"reduced coupling constant\" <strong>K</strong> is often discussed, where</p>\n</blockquote>\n\n<p><img src=\"https://i.ibb.co/T8wgBML/Capture.jpg\" alt=\"\"></p>\n\n<blockquote>\n  <p><strong>The value of J also has a sign, and couplings constants of comparable magnitude often have opposite signs</strong></p>\n</blockquote>",
      "votes": 1,
      "replies": []
    },
    {
      "id": 553044,
      "author_name": "Al Chen",
      "author_url": "",
      "post_date": "2019-06-15T03:32:35.140000",
      "content": "<p>thank you , cTatu</p>",
      "votes": 0,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "552625": "id,molecule_name,atom_index_0,atom_index_1,type,scalar_coupling_constant\n0,dsgdb9nsd_000001,1,0,1JHC,84.8076\n1,dsgdb9nsd_000001,1,2,2JHH,**-11.257**",
    "552688": "&gt; For heteronuclear coupling, the magnitude of **J** is related to the nuclear magnetic moments of the coupling partners. **F**, with a high nuclear magnetic moment, gives rise to large coupling to protons. **Rh**, with a very small nuclear magnetic moment, gives only small couplings to **H**. To correct for the effect of the nuclear magnetic moment (or equivalently the gyromagnetic ratio γ), the \"reduced coupling constant\" **K** is often discussed, where\n\n![](https://i.ibb.co/T8wgBML/Capture.jpg)\n\n&gt; **The value of J also has a sign, and couplings constants of comparable magnitude often have opposite signs**",
    "553044": "thank you , cTatu"
  }
}