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Editors' Rating:
Average User Rating:
out of 1 votes out of 1 votes

Quick Specs

  • Version:
  • Total Downloads:
  • Date Added:
    Mar. 11, 2004
  • Price:
    Free to try (20-use trial); $396.00 to buy
  • File Size:
  • Downloads Last Week:
  • Platform:

Editors' Review

Though this is a highly specialized and useful piece of software, its design and speed aren't exactly 21st century. PiSystems is designed for scientists and advanced chemistry students to help calculate the electronic spectra and colors of organic molecules. This is a large program that takes a while to download, and, once it's loaded, installation is slow. The interface, though not visually stimulating, isn't well-designed, either. During testing we noticed there is no way to scroll or zoom into displayed molecules; what's more, windows often stack up on top of each other, making it a bit of a digging exercise to find a display. Excel-like tables display most chemical data. The program toolbar offers plenty of mouse-over hints on discovering the function of each button. To draw a molecule, you must open a "molecule input" window (from the taskbar); once your sketch is done, apply the "idealize" feature. Calculations are rapid and the program allows for plenty of input or changes. The trial version allows for 20 uses, which may be of limited use for small projects.
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Publisher's Description

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User Reviews

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3 stars

"PISYSTEMS is easy to use but not nearly as accurate as claimed."

May 07, 2005  |  By jmmckel

2005-05-07 06:00:24  |  By jmmckel

 |  Version: PiSystems XTE


Easy to use and has some clever ideas


The results computed can vary significantly from version to version. Many assumptions have to be made about atom centered hybridization which can have significant impact on results. Imputed solvent is not specified; this can be a source of significant uncertainty.

I have been doing dye modeling for 25 years and have used all levels of theory from Huckel to TDDFT....

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Full Specifications

Publisher Expertsoft
Publisher web site
Release Date March 11, 2004
Date Added March 11, 2004
Version XTE
Category Educational Software
Subcategory Science Software
Operating Systems
Operating Systems Windows 95/98/Me/NT/2000/XP
Additional Requirements Windows 95/98/Me/NT/2000/XP
Download Information
File Size 10.83MB
File Name pisystems.exe
Total Downloads 1,829
Downloads Last Week 0
License Model Free to try
Limitations 20-use trial
Price $396

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