ðə kɹˈɪstəl stɹˈʌktʃɚɹ ʌv lˌæ sˈiː tˈuː ʃˈoʊz ðˌɐɾɪt kəntˈeɪnz sˈiː tˈuː jˈuːnɪts wɪð ɐ sˈiːsˈiː bˈɑːnd lˈɛŋθ ʌv wˈʌnhˈʌndɹɪd θˈɜːɾi.θɹˈiː pˌiːˈɛm, wˌɪtʃ ɪz lˈɔŋɡɚ ðɐn ðə sˈiːsˈiː bˈɑːnd lˈɛŋθ ɪn kˈælsiəm kˈɑːɹbaɪd, wˈʌnhˈʌndɹɪd nˈaɪntiːn.tˈuː pˌiːˈɛm, wˌɪtʃ ɪz klˈoʊs tə ðæt ʌv ˈɛθaɪn.
The crystal structure of LaC2 shows that it contains C2 units with a C-C bond length of 130.3 pm, which is longer than the C-C bond length in calcium carbide, 119.2 pm, which is close to that of ethyne.