Microwave spectrum and hydrogen bonding in 2-dimethylaminoethanol

The microwave spectrum of the normal species of 2-dimethylaminoethanol gives rotational constants (MHz) A = 5814.0(2), B = 2214.54(2), and C = 2037.96(2) and a dipole moment of 2.56 D, with a, b, and c components (D) of 2.27(2), 0.3(1), and 1.16(5), respectively, consistent with a gauche OCCN configuration, and an OH?N type hydrogen bond, facilitated by a central CN configuration distorted approximately 23° from “staggered.” The hydroxy d₁ species rotational constants (MHz) A = 5688.95(38), B = 2190.17(4), and C = 2028.00(4) are consistent with either the hydroxyl group structure $\text{r}\text{OH = 1.235}\text{A}\text{?}$ and COH = 100.5° or a structurally normal hydroxyl group with an approximate 0.01 ÅrO?N shrinkage upon deuteration.