Crystal structures of [μ2-(Ra ,Sa ,3aR,7aR)-1,3-bis(2,7-dicyclohexylnaphthalen-1-yl)octahydro-1H-benzo[d]imidazolidin-2-ylidene]chlorido(η4-1,5-cyclooctadiene)iridium dichloromethane monosolvate and [μ2-(Sa ,Sa ,3aR,7aR)-1,3-bis(2,7-dicyclohexylnaphthalen-1-yl)octahydro-1H-benzo[d]imidazolidin-2-ylidene]chlorido(η4-1,5-cyclooctadiene)iridium