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Synthesis, Crystal Structure, Vibrational Spectroscopy and Thermal Behavior of the First Alkali Metal Hydrated Hexaborate:K 2 [B 6 O 9 (OH) 2 ]
Author(s) -
Li HongJuan,
Liu ZhiHong,
Sun LiMei
Publication year - 2007
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200790211
Subject(s) - chemistry , monoclinic crystal system , crystallography , boron , alkali metal , raman spectroscopy , crystal structure , infrared spectroscopy , single crystal , metal , crystal (programming language) , physics , organic chemistry , optics , programming language , computer science
New hydrated potassium hexaborate K 2 [B 6 O 9 (OH) 2 ] has been synthesized under mild solvothermal conditions. The structure was determined by single‐crystal X‐ray diffraction and further characterized by FT‐IR, Raman spectra and DTA‐TG. It crystallizes in the monoclinic system with space group P 2 1 / n , a =0.9036(2) nm, b =0.66052(18) nm, c =1.5997(4) nm, β =91.862(4)°, V =0.9543(4) nm 3 and Z =4. Its crystal structure consists of K–O polyhedra and 1‐D stepped polyborate chains constructed by new [B 6 O 9 (OH) 2 ] 2− fundamental building blocks. 1‐D polyborate chains contain 3,8‐membered boron rings. Adjacent chains are further linked via H‐bonding interactions into 2‐D layers. The K + cations reside not only between the layers but also in the 8‐membered boron rings of the chains, compensating the negative charges of the borate chains and holding the layers together into the 3‐D structure through bonding with oxygen atoms of the chains.