This repository contains a web application using the pychemcurv module for local curvature analyzes of molecules. It aims to use the pychemcurv package and visualize the geometrical or chemical atomic quantities mapped on the chemical structure of your system.

The live demo of the application is available here: https://pychemcurv.onrender.com

Demo video:

You can run the application locally once you have installed pychemcurv and the dash dependencies of the application. The easiest way to this is to use the requirements.txt or the environment.yml files to set up a python environment.

Using pip, after you create a new environment

pip install -r requirements.txt

Using conda, the following will create a new environment named curv and install all dependencies inside, including pychemcurv.

conda env create -f environment.yml

Then, download the application and run it by executing the app.py file.

git clone https://github.com/gVallverdu/pychemcurv-app.git
cd pychemcurv-app
conda activate curv   # if you need to activate an environment
python app.py

This will output something like this. Open the url http://127.0.0.1:8050/ (or the one provided in the terminal) to use the application.

[user@computer] (curv) > $ python app.py
Running on http://127.0.0.1:8050/

Debugger PIN: 065-022-191
* Serving Flask app "app" (lazy loading)
* Environment: production
  WARNING: This is a development server. Do not use it in a production deployment.
  Use a production WSGI server instead.
* Debug mode: on

You can switch off the debug mode by setting debug=False on the last line of the app.py file.

If the application does not start with an error such as:

socket.gaierror: [Errno 8] nodename nor servname provided, or not known

Go to the last lines of the file app.py and comment/uncomment the last lines to get something that reads

if __name__ == '__main__':
    app.run_server(debug=True, host='127.0.0.1')
    # app.run_server(debug=False)

There you can also switch on and off the debug mode keeping the host url.

and run the application again.

• Manage file format
• Manage periodic structure
• Show/Hide atom names = species + index
• Ball and stick representation
• Zoom fit the box at the beginning

Please consider to cite the following paper when using the application or the pychemcurv module.

• Julia Sabalot-Cuzzubbo, Germain Salvato Vallverdu, Didier Bégué and Jacky Cresson Relating the molecular topology and local geometry: Haddon’s pyramidalization angle and the Gaussian curvature, J. Chem. Phys. 152, 244310 (2020).

• Julia Sabalot-Cuzzubbo, N. Cresson, Germain Salvato Vallverdu, Didier Bégué and Jacky Cresson Haddon’s POAV2 vs POAV theory for non-planar molecules, J. Chem. Phys. 159, 174109 (2023).

This software was developped at the Université de Pau et des Pays de l'Adour (UPPA) in the Institut des Sciences Analytiques et de Physico-Chimie pour l'Environement et les Matériaux (IPREM) and the Institut Pluridisciplinaire de Recherches Appliquées (IPRA) and is distributed under the MIT licence.

• Germain Salvato Vallverdu: [email protected] <[email protected]>_
• Julia Sabalot-cuzzubbo [email protected] <[email protected]>_
• Didier Bégué: [email protected] <[email protected]>_
• Jacky Cresson: [email protected] <[email protected]>_