Isocyanic acid - isocyanane

HN=C=O (43.02). Tautomer with cyanic acid HOCN. Structural isomer of fulminate HONC. Like cyanic acid, it is produced by the thermal decomposition of cyanuric acid. The gaseous molecule is H-N 0.99 Å, N-C 1.21 Å, C-O 1.17 Å. ∠HN-C 128°, ∠NC-O 180°. In the gaseous state or in solutions such as CCl ₄ , benzene, and ether, it is mainly in the form of isocyanic acid and is stable for several weeks. It is slightly soluble in water and mainly in the form of cyanic acid, but it is unstable and hydrolyzes to ammonium bicarbonate. Isocyanate esters RNCO (R is a hydrocarbon group) are often more stable than cyanate esters. Metal salts of both MNCO and MOCN types are obtained depending on the type of metal. Metal complexes with both O -coordinated (cyanato complexes) and N -coordinated (isocyanato complexes) ligands are known. [CAS 75-13-8]

Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition

HN=C=O(43.02)．シアン酸HOCNとの互変異性体．雷酸HONCの構造異性体．シアン酸と同じく，シアヌル酸の熱分解で生成する．気体分子は，H-N0.99 Å，N-C1.21 Å，C-O1.17 Å．∠H-N-C128°，∠N-C-O180°．気体状態またはCCl₄，ベンゼン，エーテルなどの溶液中では，おもにイソシアン酸の形をとり，数週間は安定である．水にわずかに溶け，主としてシアン酸形をとるが，不安定で加水分解して炭酸水素アンモニウムになる．イソシアン酸エステルRNCO(Rは炭化水素基)には，シアン酸エステルに比べて，安定なものが多い．金属塩は，金属の種類によってMNCO，MOCNの双方の型のものが得られる．金属錯体でも配位子がO-配位(シアナト錯体)，N-配位(イソシアナト錯体)の双方のものが知られている．[CAS 75-13-8]

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