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Transparent single crystals were synthesised from Ga, Li, B, red phosphorus and C at 1500\u2009\u00b0C in boron nitride crucibles welded in Ta ampoules. Depending on the type of boron used for the synthesis we obtained colourless, brown and red single crystals with slightly different P\/C ratios. Colourless LiB<jats:sub>12<\/jats:sub>PC crystallizes orthorhombic in the space group <jats:italic>Imma<\/jats:italic> (No. 74) with <jats:italic>a<\/jats:italic>=10.188(2)\u2005\u00c5, <jats:italic>b<\/jats:italic>=5.7689(11)\u2005\u00c5, <jats:italic>c<\/jats:italic>=8.127(2)\u2005\u00c5 and <jats:italic>Z<\/jats:italic>=4. Brown LiB<jats:sub>12<\/jats:sub>P<jats:sub>0.89<\/jats:sub>C<jats:sub>1.11<\/jats:sub> is very similar, but with a lower P content. Red single crystals of LiB<jats:sub>12<\/jats:sub>P<jats:sub>1.13<\/jats:sub>C<jats:sub>0.87<\/jats:sub> have a larger unit cell with <jats:italic>a<\/jats:italic>=10.4097(18)\u2005\u00c5, <jats:italic>b<\/jats:italic>=5.9029(7)\u2005\u00c5, <jats:italic>c<\/jats:italic>=8.2044(12)\u2005\u00c5. EDX measurements confirm that the red crystals contain more phosphorus than the other ones. The crystal structure is characterized by a covalent network of B<jats:sub>12<\/jats:sub> icosahedra connected by exohedral B\uf8ffB bonds and P\uf8ffP, P\uf8ffC or C\uf8ffC units. Li atoms are located in interstitials. The structure is closely related to MgB<jats:sub>7<\/jats:sub>, LiB<jats:sub>13<\/jats:sub>C<jats:sub>2<\/jats:sub> and ScB<jats:sub>13<\/jats:sub>C. LiB<jats:sub>12<\/jats:sub>PC fulfils the electron counting rules of Wade and also Longuet\u2010Higgins. Measurements of Vickers micro\u2010hardness (<jats:italic>H<\/jats:italic><jats:sub>V<\/jats:sub>=27\u2005GPa) revealed that LiB<jats:sub>12<\/jats:sub>PC is a hard material. The optical band gaps obtained from UV\/Vis spectra match the colours of the crystals. Furthermore we report on the IR and Raman spectra.<\/jats:p>","DOI":"10.1002\/chem.201002968","type":"journal-article","created":{"date-parts":[[2011,2,9]],"date-time":"2011-02-09T08:00:06Z","timestamp":1297238406000},"page":"3128-3135","source":"Crossref","is-referenced-by-count":14,"title":["LiB<sub>12<\/sub>PC, the First Boron\u2010Rich Metal Boride with Phosphorus\u2014Synthesis, Crystal Structure, Hardness, Spectroscopic Investigations"],"prefix":"10.1002","volume":"17","author":[{"given":"Natascha","family":"Vojteer","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vanessa","family":"Sagawe","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Julia","family":"Stauffer","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Melanie","family":"Schroeder","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Harald","family":"Hillebrecht","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,2,9]]},"reference":[{"doi-asserted-by":"publisher","key":"e_1_2_6_1_2","DOI":"10.1002\/ange.200903246"},{"doi-asserted-by":"publisher","key":"e_1_2_6_1_3","DOI":"10.1002\/anie.200903246"},{"doi-asserted-by":"publisher","key":"e_1_2_6_2_2","DOI":"10.1002\/zaac.201008025"},{"unstructured":"\u00a0","key":"e_1_2_6_3_2"},{"volume-title":"Handbook of Ceramic Hard Materials","year":"2000","key":"e_1_2_6_4_2"},{"volume-title":"Landolt\u2010B\u00f6rnstein Numerical Data and Functional Relationships in Science and Technology\u2014 New Series, Supplement to Vol.\u2005III\/17g: Non\u2010Tetrahedrally Bonded Binary Compounds II","year":"2000","author":"K\u00fcck S.","key":"e_1_2_6_5_2"},{"unstructured":"\u00a0","key":"e_1_2_6_6_2"},{"doi-asserted-by":"publisher","key":"e_1_2_6_7_2","DOI":"10.1007\/978-3-642-66620-9"},{"key":"e_1_2_6_8_2","first-page":"408","volume":"239","author":"Burmeister R. 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