ðə stɹˈʌktʃɚɹ ʌv lˌæ sˈiː tˈuː kæn biː dᵻskɹˈaɪbd æz lˌæ θɹˈiː plˈʌs sˈiː twˈɛnti tˈuː mˈaɪnəs ˈiː wˌɛɹ ðɪ ᵻlˈɛktɹɑːn ˈɛntɚz ðə kəndˈʌkʃən bˈænd ænd ˌæntɪbˈɑːndɪŋ ˈɔːɹbɪɾəlz ɔnðə sˈiː tˈuː ˈænaɪən, ɪŋkɹˈiːsɪŋ ðə bˈɑːnd lˈɛŋθ.
The structure of LaC2 can be described as La3+C22−(e-) where the electron enters the conduction band and antibonding orbitals on the C2 anion, increasing the bond length.