In chemistry, T-shaped molecular geometry describes the structures of some molecules where a central atom has three ligands.

Ordinarily, three-coordinated compounds adopt trigonal planar or pyramidal geometries.

[1] According to VSEPR theory, T-shaped geometry results when three ligands and two lone pairs of electrons are bonded to the central atom, written in AXE notation as AX3E2.

[2] The trifluoroxenate(II) anion, XeF−3, has been investigated as a possible first example of an AX3E3 molecule, which might be expected by VSEPR reasoning to have six electron pairs in an octahedral arrangement with both the three lone pairs and the three ligands in a mer or T-shaped orientations.

[3] Although this anion has been detected in the gas phase, attempts at synthesis in solution and experimental structure determination were unsuccessful.