TY - JOUR
T1 - Dyeing polymorphs
T2 - The MALDI host 2,5-dihydroxybenzoic acid
AU - Cohen, Dawn E.
AU - Benedict, Jason B.
AU - Morlan, Brian
AU - Chiu, Daniel T.
AU - Kahr, Bart
PY - 2007/3
Y1 - 2007/3
N2 - The dye methyl red was used to distinguish concomitant polymorphs of the matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) host, 2,5-dihydroxybenzoic acid. Red and purple crystals were readily separated by inspection. They corresponded to the known Form I (P21/c, a = 4.9110(3) Å, b = 11.8280(7) Å, c = 11.0580(6) Å, β = 91.059(3)°, V = 642.22 Å3) and Form II (P21/c, a = 5.5610(2) Å, b = 4.8690(1) Å, c = 23.6880 (8) Å, β = 100.191(1)°, V = 631.27 Å3), respectively. X-ray structures of cocrystals of dihydroxybenzoic acids and methyl red, measurements of the linear dichroism of mixed crystals, and force-field calculations were used to investigate the mechanism of differential coloring. The relevance of the observations to investigations of the MALDI mechanism are discussed.
AB - The dye methyl red was used to distinguish concomitant polymorphs of the matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) host, 2,5-dihydroxybenzoic acid. Red and purple crystals were readily separated by inspection. They corresponded to the known Form I (P21/c, a = 4.9110(3) Å, b = 11.8280(7) Å, c = 11.0580(6) Å, β = 91.059(3)°, V = 642.22 Å3) and Form II (P21/c, a = 5.5610(2) Å, b = 4.8690(1) Å, c = 23.6880 (8) Å, β = 100.191(1)°, V = 631.27 Å3), respectively. X-ray structures of cocrystals of dihydroxybenzoic acids and methyl red, measurements of the linear dichroism of mixed crystals, and force-field calculations were used to investigate the mechanism of differential coloring. The relevance of the observations to investigations of the MALDI mechanism are discussed.
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U2 - 10.1021/cg060887w
DO - 10.1021/cg060887w
M3 - Article
AN - SCOPUS:33947528029
SN - 1528-7483
VL - 7
SP - 492
EP - 495
JO - Crystal Growth and Design
JF - Crystal Growth and Design
IS - 3
ER -