Hydrolysis of di-t-butylgermanium dichloride yields di-t-butylgermanium dihy-droxide which could be isolated as a crystalline solid. X-ray structure determination shows t-Bu2Ge(OH)2 tetrahedra held together by hydrogen bonds and thus forming continuous double chains. Di-t-butylgermanium oxide has been prepared by dehydration of the dihydroxide. The structure consists of trimeric molecules (t-Bu2GeO)3