Zinc Borate Hydrolysis.

The crystalline zinc borate phase ZnBO(OH), known in commerce as 2ZnO·3BO·3.5HO, is an important industrial material used as a fire-retardant synergist in polymers, a source of micronutrients in agriculture, and a preservative in building materials. It lends durability to wood composite building materials by inhibiting attack by wood destroying organisms.

Hydrated Zinc Borates and Their Industrial Use.

Zinc borates are important chemical products having industrial applications as functional additives in polymers, bio-composites, paints and ceramics. Of the thirteen well documented hydrated binary zinc borates, Zn[BO(OH)] (2ZnO3BO3HO) is manufactured in the largest quantity and is known as an article of commerce as 2ZnO3BO∙3.5HO.

Structure and Properties of Sodium Enneaborate, Na[BO(OH)]·B(OH)·2HO.

Millions of tons of sodium borates are used annually by global industries in diverse applications important to modern society. The NaO-BO-HO phase diagram in the 0-100 °C temperature range contains 13 unique hydrated crystalline sodium borates, including five important industrial products. Structures were previously reported for each of these except for that having the highest boron content, known as sodium enneaborate, NaBO·11HO or 2NaO·9BO·11HO (1).

Solid-State Synthesis and Structure of the Enigmatic Ammonium Octaborate: (NH4)2[B7O9(OH)5]·3/4B(OH)3·5/4H2O.

The compound known since the 19th century as ammonium octaborate was structurally characterized revealing the ammonium salt of the ribbon isomer of the heptaborate anion, [B7O9(OH)5](2-), with boric acid and water molecules. Of composition (NH4)2B7.75O12.

Synthesis and structure of a new heptaborate oxoanion isomer: B7O9(OH)5(2-).

The nonmetal borate [H3N(CH2)7NH3][B7O9(OH)5].H2O (1) was prepared via a neat reaction of 1,7-diaminoheptane with excess boric acid under mild nonhydrothermal conditions. Single-crystal X-ray characterization of 1 revealed a new isomer of the heptaborate anion, B7O9(OH)5(2-).

Crystalline alcoholamine borates and the triborate monoanion.

The triborate and pentaborate compounds 3-hydroxy-2,2-dimethylpropylammonium triborate(1+), [HOCH2C(CH3)2NH3][B3O3(OH)4] (1), and 2-hydroxyethylammonium pentaborate(1-), [HOCH2CH2NH3][B5O6(OH)4].H2O (2), were prepared by crystallization from concentrated aqueous boric acid solutions containing the respective alcoholamines at a boric acid-alcoholamine mole ratio of 3.33:1.

(Trimethylsilyl)phosphine as a Versatile Reagent for Syntheses of New 4-Sila- and 4-Phosphaphosphorinanes.

(Trimethylsilyl)phosphine (Me(3)SiPH(2)) undergoes radical P-H bond addition to vinylphosphines and -silanes to form new 4-phospha- and 4-silaphosphorinanes [vinyl reagent]: [PhP(CH=CH(2))(2)], PhP(C(2)H(4))(2)PSiMe(3) diastereomers (9A/9B); [Et(2)NP(CH=CH(2))(2)], Et(2)NP(C(2)H(4))(2)PSiMe(3) (11); [Me(2)Si(CH=CH(2))(2)], Me(2)Si(C(2)H(4))(2)PSiMe(3) (14); [Si(CH=CH(2))(4)], (CH=CH(2))(2)Si(C(2)H(4))(2)PSiMe(3) (16) and [Me(3)SiP(C(2)H(4))(2)](2)Si (17). Reactions are accompanied by formation of only small quantities of the Markovnikov addition product phospholanes. Methanolysis of the new silylphosphines yields PhP(C(2)H(4))(2)PH diastereomers (10A/10B), Me(2)Si(C(2)H(4))PH (15), (CH=CH(2))(2)Si(C(2)H(4))(2)PH (18), and [HP(C(2)H(4))(2)](2)Si (19).