A fluorinated ether compound is represented by formula: [X.sup.2.sub.3-n2R.sup.23.sub.n2SiR.sup.22].sub.3CR.sup.21[N(R.sup.2)C(O)].sub.p2(R.sup.f2O).sub.m2-Q.sup.2-[C(O)N(R.sup.2)].sub.p2R.sup.21C[R.sup.22SiR.sup.23.sub.n2X.sup.2.sub.3-n2].sub.3. R.sup.f2 is a fluoroalkylene group having no branched structure, Q.sup.2 is a fluoroalkylene group having no branched structure, R.sup.2 is a hydrogen atom or an alkyl group, R.sup.21 is a single bond, an alkylene group, an alkylene group comprising an etheric oxygen atom at its terminal on the side bonded to [X.sup.2.sub.3-n2R.sup.23.sub.n2SiR.sup.22].sub.3C, an alkylene group with at least two carbon atoms comprising an etheric oxygen atom between its carbon-carbon atoms, or an alkylene group with at least two carbon atoms comprising an etheric oxygen atom between its carbon-carbon atoms and at its terminal on the side bonded to [X.sup.2.sub.3-n2R.sup.23.sub.n2SiR.sup.22].sub.3C, R.sup.22 is an alkylene group, or the like, R.sup.23 is a hydrogen atom or a monovalent hydrocarbon group, and X.sup.2 is a hydrolyzable group.

A fluorinated ether compound is represented by formula: [X.sup.2.sub.3-n2R.sup.23.sub.n2SiR.sup.22].sub.3CR.sup.21[N(R.sup.2)C(O)].sub.p2(R.sup.f2O).sub.m2-Q.sup.2-[C(O)N(R.sup.2)].sub.p2R.sup.21C[R.sup.22SiR.sup.23.sub.n2X.sup.2.sub.3-n2].sub.3. R.sup.f2 is a fluoroalkylene group having no branched structure, Q.sup.2 is a fluoroalkylene group having no branched structure, R.sup.2 is a hydrogen atom or an alkyl group, R.sup.21 is a single bond, an alkylene group, an alkylene group comprising an etheric oxygen atom at its terminal on the side bonded to [X.sup.2.sub.3-n2R.sup.23.sub.n2SiR.sup.22].sub.3C, an alkylene group with at least two carbon atoms comprising an etheric oxygen atom between its carbon-carbon atoms, or an alkylene group with at least two carbon atoms comprising an etheric oxygen atom between its carbon-carbon atoms and at its terminal on the side bonded to [X.sup.2.sub.3-n2R.sup.23.sub.n2SiR.sup.22].sub.3C, R.sup.22 is an alkylene group, or the like, R.sup.23 is a hydrogen atom or a monovalent hydrocarbon group, and X.sup.2 is a hydrolyzable group.

The present disclosure relates to a compound according to Formula (I) and to a method for producing the compound as well as to the use of the compound as an intermediate in the production of coated nanostructures. The present disclosure also relates to such nanostructures and to the use of such nanostructures as carriers of radionuclides as well as pharmaceutical compositions comprising such nanostructures.

The present disclosure relates to a compound according to Formula (I) and to a method for producing the compound as well as to the use of the compound as an intermediate in the production of coated nanostructures. The present disclosure also relates to such nanostructures and to the use of such nanostructures as carriers of radionuclides as well as pharmaceutical compositions comprising such nanostructures.

Provided are: a polyglycerin-chain surface-modified nanodiamond having excellent dispersibility in a low-polarity solvent; and a method of producing the polyglycerin-chain surface-modified nanodiamond. A surface-modified nanodiamond 1 includes a nanodiamond particle 2 and a surface-modifying group 3 that surface-modifies the nanodiamond particle 2, the surface-modifying group 3 having a polyglycerin chain in which a hydrogen atom of at least some of the hydroxyl groups in the polyglycerin chain is substituted by a monovalent organic group.

Provided are: a polyglycerin-chain surface-modified nanodiamond having excellent dispersibility in a low-polarity solvent; and a method of producing the polyglycerin-chain surface-modified nanodiamond. A surface-modified nanodiamond 1 includes a nanodiamond particle 2 and a surface-modifying group 3 that surface-modifies the nanodiamond particle 2, the surface-modifying group 3 having a polyglycerin chain in which a hydrogen atom of at least some of the hydroxyl groups in the polyglycerin chain is substituted by a monovalent organic group.

A higher secondary alcohol alkoxylate precursor is obtained by reacting a long-chain olefin with a (poly)alkylene glycol. The precursor has a content of (poly)alkylene glycol of 0.2% by mass or lower with respect to the total mass of the higher secondary alcohol alkoxylate; a higher secondary alcohol alkoxylate adduct which is an alkylene oxide adduct of the higher secondary alcohol alkoxylate precursor; and a higher secondary alkyl ether sulfate ester salt which is a sulfated product of the higher secondary alcohol alkoxylate precursor or the higher secondary alcohol alkoxylate adduct.

A higher secondary alcohol alkoxylate precursor is obtained by reacting a long-chain olefin with a (poly)alkylene glycol. The precursor has a content of (poly)alkylene glycol of 0.2% by mass or lower with respect to the total mass of the higher secondary alcohol alkoxylate; a higher secondary alcohol alkoxylate adduct which is an alkylene oxide adduct of the higher secondary alcohol alkoxylate precursor; and a higher secondary alkyl ether sulfate ester salt which is a sulfated product of the higher secondary alcohol alkoxylate precursor or the higher secondary alcohol alkoxylate adduct.