Fluoropolyether group-containing silane compound

A fluoropolyether group-containing silane compound of the formula (Ia) or the formula (Ib):

• RF1—XA—RSi (1a)
• RSi—XA—RF2—XA—RSi (1b)
• wherein
• RF1 is each independently at each occurrence Rf1—RF—Oq—;
• RF2 is —Rf2p—RF—Og—;
• Rf1 is each independently at each occurrence a C1-16 alkyl group optionally substituted with one or more fluorine atoms;
• Rf2 is a C1-6 alkylene group optionally substituted with one or more fluorine atoms;
• RF is each independently at each occurrence a divalent fluoropolyether group;
• p is 0 or 1;
• q is each independently at each occurrence 0 or 1;
• XA is each independently at each occurrence —X1r1—W—X2r2—;
• X1 is a divalent organic group;
• W is a 5-membered heterocyclic ring having two or more heteroatoms;
• at least one of the heteroatoms is a N atom;
• X2 is a divalent organic group;
• r1 is 0 or 1;
• r2 is 0 or 1;
• RSi is each independently at each occurrence represented by the formula (S1):
• -A1(Z1—Si R11nR123-n)mRe3-m (S1)
• A1 is C or Si;
• Z1 is each independently at each occurrence a divalent organic group;
• R11 is each independently at each occurrence a hydroxyl group or a hydrolyzable group;
• R12 is each independently at each occurrence a hydrogen atom or a monovalent organic group;
• n is each independently at each occurrence an integer of 1 to 3;
• Re is each independently at each occurrence a hydrogen atom, a hydroxyl group, or a monovalent organic group;
• and
• m is each independently at each occurrence 2 or 3.