“Impact of Larger Atoms in C=X Groups on Electronegativity and Hydrogen-Bond Donor Strength”

https://pubmed.ncbi.nlm.nih.gov/38117278

Larger atoms in C=X groups can result in a greater electronegativity and enhanced hydrogen-bond donor strength, such as H2NC(=SiR2)R being a stronger hydrogen-bond donor than H2NC(=CR2)R.