iSpartan is a versatile app for molecular modeling on the iPad, iPhone, and iPod Touch. The app allows any chemist fast and easy access to computational methods that have proven reliable for a large range of molecules.
Molecules are created by two-dimensional sketching, analogous to drawing a structure on paper. The app converts the two-dimensional sketch into a three-dimensional structure. Low-energy conformations can then be calculated and their geometries be queried. A database of 5,000 molecules (a subset of the Spartan Spectra and Properties Database, SSPD) can furthermore be accessed to obtain NMR and IR spectra, molecular orbitals, electrostatic potential maps, and other atomic and molecular properties. The database can be searched for substructures.
• Identify the most favorable conformer
• Assess alternative energy conformers
• Present the results in a clear energy diagram
iSpartan uses the proven MMFF force field and performs conformational searching in real time.
Properties available for any molecule:
• R / S chirality
• Molecular weight
• Total surface area and polar surface area
• Molecular volume
• Log P
• Vicinal coupling constants
• Distances, angles, and torsion angles
Spectra and other properties calculated using quantum mechanics are available for the 5,000 molecules in the database that is included with iSpartan. For common organic molecules, quantum chemistry calculations can be carried out if the Spartan Parallel Suite program is installed (separate product; available for Windows or Macintosh). Spartan Parallel Suite also provides access to the full SSPD (> 250,000 molecules) via the iPad, iPhone, or iPod Touch.
• Assign peaks in proton and carbon spectra
• Confirm or reject structure predictions
• Suggest which structure is most consistent with the data
• Explore and suggest alternative structures
iSpartan combines the results of density functional calculations (EDF2/6-31G* model) with an empirical correction to obtain highly accurate spectra. Unlike purely empirical schemes, iSpartan always fully accounts for both 3D structure (stereochemistry) and conformation.
• Identify the best tautomer or isomer
• Assess product distributions at equilibrium
• Classify reactions as endothermic or exothermic
iSpartan obtains the total energy from DFT calculations. The heat of formation of most organic molecules can also be estimated using the highly accurate T1 thermochemical recipe.
• Assign absorption bands to functional groups
• Confirm or reject structure predictions
• Animate molecular vibrations associated with the absorption bands
The shown spectrum is based on DFT calculations and includes a scaling factor for the frequencies. Temperature effects are accounted for by broadening of the absorption bands. The result is an accurate and realistic spectrum similar to experimental data.
Molecular orbitals and electrostatic potential maps:
• Analyze frontier orbitals in order to predict reactivity
• Use electrostatic potential maps to assess selectivity, reactivity, and acid strength and to distinguish between polar (hydrophilic) and nonpolar (hydrophobic) regions
Other calculated properties:
• Partial charges of atoms
• Dipole moments
Greater productivity in chemical research through molecular modeling...this is iSpartan.
Support for viewing NMR data from Spartan'16
Ratings and Reviews
Organic Chemistry Student
Well, this is my new favorite app, EVER. I use spartan at the university, but I didn’t expect the app to be as good as it is. It gives spectra for molecules and even demonstrates what the stretch/bend looks like on the molecule if you hover over an absorption/peak value. What?? Crazy! Easy to use, definitely worth money!! (I’ve been sitting here sketching/evaluating molecules with this app for the last 5hrs), this is awesome! Would absolutely recommend it.
Frustrating to use
I had to obtain this for a class and do not think my professor knew how much of a pain the app is. Some of the issues I have had are: to add a ring you have to tap multiple times (certain my phone is not the issue), you are only allowed to go back once, multiple taps needed to delete anything (there is tremendous room for improvement when it comes to precision), also it is unclear if the lone e- symbol represents an e- pair or is a single e-, and there are no instructional videos for the app on YouTube or spartans website. I think once these issues are fixed it will be an awesome app but for now it is very frustrating to use and time consuming. To professors it would be better to require students to obtain the pc version because the app is not well developed and lacks instructional resources.
Paid for the app but difficult to work with. Wish I had not paid for it. I prefer the orange NMR for free for what I needed to do. Would not recommend.
With Family Sharing set up, up to six family members can use this app.